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Document and Entity Information - shares	9 Months Ended
Sep. 30, 2018	Oct. 23, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	BGFV
Entity Registrant Name	BIG 5 SPORTING GOODS CORP
Entity Central Index Key	0001156388
Current Fiscal Year End Date	--12-30
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		21,428,274

Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash	$ 5,018	$ 7,170
Accounts receivable, net of allowances of $38 and $79, respectively	14,835	10,886
Merchandise inventories, net	314,837	313,905
Prepaid expenses	13,099	18,930
Total current assets	347,789	350,891
Property and equipment, net	75,587	77,265
Deferred income taxes	13,306	14,172
Other assets, net of accumulated amortization of $1,715 and $1,575, respectively	4,402	2,732
Total assets	441,084	445,060
Current liabilities:
Accounts payable	83,340	113,740
Accrued expenses	61,475	68,226
Current portion of capital lease obligations	2,294	1,754
Total current liabilities	147,109	183,720
Deferred rent, less current portion	15,218	15,948
Capital lease obligations, less current portion	4,932	2,800
Long-term debt	83,523	45,000
Other long-term liabilities	9,772	10,523
Total liabilities	260,554	257,991
Commitments and contingencies
Stockholders' equity:
Common stock, $0.01 par value, authorized 50,000,000 shares; issued 25,078,487 and 24,919,624 shares, respectively; outstanding 21,428,274 and 21,345,159 shares, respectively	250	249
Additional paid-in capital	117,863	116,495
Retained earnings	104,944	112,424
Less: Treasury stock, at cost; 3,650,213 and 3,574,465 shares, respectively	(42,527)	(42,099)
Total stockholders' equity	180,530	187,069
Total liabilities and stockholders' equity	$ 441,084	$ 445,060

Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Income Statement [Abstract]
Net sales	$ 266,351	$ 270,471	$ 740,480	$ 766,746
Cost of sales	183,852	182,923	509,984	516,268
Gross profit	82,499	87,548	230,496	250,478
Selling and administrative expense	77,680	77,358	225,824	226,190
Operating income	4,819	10,190	4,672	24,288
Interest expense	860	447	2,309	1,095
Income before income taxes	3,959	9,743	2,363	23,193
Income taxes	844	3,793	805	9,139
Net income	$ 3,115	$ 5,950	$ 1,558	$ 14,054
Earnings per share:
Basic	$ 0.15	$ 0.28	$ 0.07	$ 0.65
Diluted	0.15	0.28	0.07	0.65
Dividends per share	$ 0.15	$ 0.15	$ 0.45	$ 0.45
Weighted-average shares of common stock outstanding:
Basic	20,990	21,324	20,972	21,584
Diluted	21,000	21,355	21,021	21,752

Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Outstanding [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock, At Cost [Member]
Beginning Balance at Jan. 01, 2017	$ 205,037		$ 248	$ 114,797	$ 124,363	$ (34,371)
Beginning Balance, Shares at Jan. 01, 2017		22,012,651
Net income	14,054				14,054
Dividends on common stock	(9,849)				(9,849)
Issuance of nonvested share awards			2	(2)
Issuance of nonvested share awards, Shares		203,112
Exercise of share option awards	67			67
Exercise of share option awards, Shares		11,086
Share-based compensation	1,750			1,750
Forfeiture of nonvested share awards, Shares		(21,555)
Retirement of common stock for payment of withholding tax	(805)		(1)	(804)
Retirement of common stock for payment of withholding tax, Shares		(54,012)
Net disgorgement of stockholder's short-swing profits	136			136
Purchases of treasury stock	(6,904)					(6,904)
Purchases of treasury stock, Shares		(677,109)
Ending Balance at Oct. 01, 2017	203,486		249	115,944	128,568	(41,275)
Ending Balance, shares at Oct. 01, 2017		21,474,173
Beginning Balance at Dec. 31, 2017	187,069		249	116,495	112,424	(42,099)
Beginning Balance, Shares at Dec. 31, 2017		21,345,159
Net income	1,558				1,558
Cumulative adjustment from change inaccounting principle, net of tax	575				575
Dividends on common stock	(9,613)				(9,613)
Issuance of nonvested share awards			2	(2)
Issuance of nonvested share awards, Shares		213,062
Exercise of share option awards	$ 31			31
Exercise of share option awards, Shares	6,564	6,564
Share-based compensation	$ 1,704			1,704
Forfeiture of nonvested share awards, Shares		(7,420)
Retirement of common stock for payment of withholding tax	$ (366)		(1)	(365)
Retirement of common stock for payment of withholding tax, Shares	(53,343)	(53,343)
Purchases of treasury stock	$ (428)					(428)
Purchases of treasury stock, Shares		(75,748)
Ending Balance at Sep. 30, 2018	$ 180,530		$ 250	$ 117,863	$ 104,944	$ (42,527)
Ending Balance, shares at Sep. 30, 2018		21,428,274

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017
Cash flows from operating activities:
Net income	$ 1,558	$ 14,054
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	14,374	14,324
Share-based compensation	1,704	1,750
Amortization of other assets	141	130
Deferred income taxes	659	2,140
Changes in operating assets and liabilities:
Accounts receivable, net	1,404	3,599
Merchandise inventories, net	(932)	(15,012)
Prepaid expenses and other assets	381	(1,701)
Accounts payable	(18,029)	(12,033)
Accrued expenses and other long-term liabilities	(9,319)	(12,802)
Net cash used in operating activities	(8,059)	(5,551)
Cash flows from investing activities:
Purchases of property and equipment	(8,448)	(11,374)
Net cash used in investing activities	(8,448)	(11,374)
Cash flows from financing activities:
Borrowings under revolving credit facility	167,213	177,785
Payments under revolving credit facility	(128,690)	(141,358)
Changes in book overdraft	(12,382)	(3,671)
Debt issuance costs paid		(140)
Principal payments under capital lease obligations	(1,413)	(1,181)
Proceeds from exercise of share option awards	31	67
Proceeds from disgorgement of stockholder's short-swing profits		346
Purchases of treasury stock	(428)	(6,829)
Tax withholding payments for share-based compensation	(366)	(805)
Dividends paid	(9,610)	(9,840)
Net cash provided by financing activities	14,355	14,374
Net decrease in cash	(2,152)	(2,551)
Cash at beginning of period	7,170	7,895
Cash at end of period	5,018	5,344
Supplemental disclosures of non-cash investing and financing activities:
Property and equipment acquired under capital leases	4,146	2,666
Property and equipment additions unpaid	2,036	1,734
Supplemental disclosures of cash flow information:
Interest paid	2,130	972
Income taxes paid	$ 20	$ 10,003

Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

(2)	Summary of Significant Accounting Policies

Consolidation

The accompanying Interim Financial Statements include the accounts of Big 5 Sporting Goods Corporation, Big 5 Corp. and Big 5 Services Corp. Intercompany balances and transactions have been eliminated in consolidation.

Reporting Period

The Company follows the concept of a 52-53 week fiscal year, which ends on the Sunday nearest December 31. Fiscal year 2018 is comprised of 52 weeks and ends on December 30, 2018. Fiscal year 2017 was comprised of 52 weeks and ended on December 31, 2017. The fiscal interim periods in fiscal 2018 and 2017 are each comprised of 13 weeks.

Recently Adopted Accounting Updates

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606), which was further clarified and amended in 2015 and 2016 and supersedes most preexisting revenue recognition guidance with a comprehensive new revenue recognition model. The core principle is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also requires disclosures regarding the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The Company adopted this standard on January 1, 2018 using the modified retrospective approach. Further disclosures relative to the adoption of this standard are provided in the Revenue Recognition policy section of this Note 2 to the Interim Financial Statements.

Recently Issued Accounting Updates

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which requires lessees to recognize on the balance sheet assets and liabilities for leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee will depend primarily on its classification as a finance or operating lease. However, unlike current GAAP—which requires only capital leases to be recognized on the balance sheet—the new ASU will require both types of leases to be recognized on the balance sheet. The ASU will take effect for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. This ASU can be applied at the beginning of the earliest period presented using the modified retrospective approach, which includes certain practical expedients that an entity may elect to apply, including an election to use certain transition relief. In July 2018, the FASB issued ASU No. 2018-10, Codification Improvements to Topic 842, Leases and ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, which make improvements to Accounting Standards Codification (“ASC”) 842 and allow entities to not restate comparative periods in transition to ASC 842 and instead report the comparative periods under ASC 840. The Company plans to adopt this standard using the modified retrospective approach in the first quarter of fiscal 2019, coinciding with the standard’s effective date. While the Company is still evaluating this ASU and related updates, the Company has determined that the primary impact will be to recognize on the balance sheet material right-of-use assets and material lease obligations for all leases with lease terms greater than 12 months. The Company’s project team is finalizing the implementation of a new lease administration and accounting software. As part of this implementation, the project team is developing and mapping new and existing controls in the context of the Company’s control environment. In addition, the project team continues to evaluate the practical expedients offered and enhanced disclosures required in the ASU, as well as to identify arrangements that contain embedded leases, among other activities, to account for this standard upon adoption.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurements (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement. This standard removes, modifies, and adds certain disclosure requirements for fair value measurements. This pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted. While the Company is currently in the process of evaluating the effects of this standard on its consolidated financial statements, the Company plans to adopt ASU No. 2018-13 in the first quarter of fiscal 2020, coinciding with the standard’s effective date, and expects the impact from this standard to be immaterial.

In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This standard aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The Company’s accounting for the service element of a hosting arrangement that is a service contract is not affected by the proposed amendments and will continue to be expensed as incurred in accordance with existing guidance. This standard does not expand on existing disclosure requirements except to require a description of the nature of hosting arrangements that are service contracts. This standard is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted, including adoption in any interim period for which financial statements have not been issued. Entities can choose to adopt the new guidance prospectively or retrospectively. Except for the updated disclosure requirements, the Company’s current accounting for the service element of a hosting arrangement that is a service contract is consistent with the prescribed treatment in this standard. The Company plans to adopt ASU No. 2018-15 prospectively in the first quarter of fiscal 2020, coinciding with the standard’s effective date, and expects the impact from this standard to be immaterial.

Other recently issued accounting updates are not expected to have a material impact on the Company’s consolidated financial statements.

Use of Estimates

Management has made a number of estimates and assumptions relating to the reporting of assets, liabilities and stockholders’ equity and the disclosure of contingent assets and liabilities as of the date of the Interim Financial Statements and reported amounts of revenue and expense during the reporting period to prepare these Interim Financial Statements in conformity with GAAP. Certain items subject to such estimates and assumptions include the carrying amount of merchandise inventories, and property and equipment; valuation allowances for receivables, sales returns and deferred income tax assets; estimates related to gift cards and returned merchandise credits (collectively, “stored-value cards”) and the valuation of share-based compensation awards; and obligations related to litigation, self-insurance liabilities and employee benefits. Actual results could differ significantly from these estimates under different assumptions and conditions.

Revenue Recognition

On January 1, 2018, the Company adopted ASC 606, Revenue from Contracts with Customers, using the modified retrospective approach for all contracts not completed as of the date of adoption. Results for the reporting periods beginning on January 1, 2018 are presented under ASC 606, while prior period amounts are not adjusted and continue to be reported in accordance with accounting under ASC 605, Revenue Recognition. As a result of adopting ASC 606, the Company recorded an increase to retained earnings of $0.6 million, net of tax, as of January 1, 2018, due to the cumulative effect related to the change in accounting for stored-value card breakage. In addition, the Company recorded estimated right-of-return merchandise cost of $1.3 million related to estimated sales returns, with a corresponding increase to the sales return reserve recorded in accrued expenses; and revenues related to online sales were recognized upon shipment rather than delivery to the customer, with the cumulative effect related to this change determined to be immaterial.

The Company operates solely as a sporting goods retailer, which includes both retail stores and an e-commerce platform, that offers a broad range of products in the western United States and online. Generally, all revenues are recognized when control of the promised goods is transferred to customers, in an amount that reflects the consideration in exchange for those goods. Accordingly, the Company implicitly enters into a contract with customers to deliver merchandise inventory at the point of sale. Collectibility is reasonably assured since the Company only extends immaterial credit purchases to certain municipalities and local school districts.

As noted in the segment information in the notes to the consolidated financial statements of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017 and Note 1 to these Interim Financial Statements, the Company’s business consists of one reportable segment. In accordance with ASC 606, the Company disaggregates net sales into the following major merchandise categories to depict the nature and amount of revenue and related cash flows:

	13 Weeks Ended				39 Weeks Ended
	September 30, 2018		October 1, 2017		September 30, 2018		October 1, 2017
	(In thousands)
Hard goods	$	145,822	$	147,525	$	379,288	$	391,236
Athletic and sport apparel		45,111		44,425		146,147		151,503
Athletic and sport footwear		74,128		77,124		210,679		219,095
Other sales		1,290		1,397		4,366		4,912
Net sales	$	266,351	$	270,471	$	740,480	$	766,746

Substantially all of the Company’s revenue is for single performance obligations for the following distinct items:

•

Retail store sales

•

E-commerce sales

•

Stored-value cards

For performance obligations related to retail store and e-commerce sales contracts, the Company typically transfers control, for retail stores, upon consummation of the sale when the product is paid for and taken by the customer and, for e-commerce sales, when the product is tendered for delivery to the common carrier. For performance obligations related to stored-value cards, the Company typically transfers control at a point in time upon redemption of the stored-value card through consummation of a future sales transaction.

The transaction price for each contract is the stated price on the product, reduced by any stated discounts at that point in time. The Company does not engage in sales of products that attach a future material right which could result in a separate performance obligation for the purchase of goods in the future at a material discount. The implicit point-of-sale contract with the customer, as reflected in the transaction receipt, states the final terms of the sale, including the description, quantity, and price of each product purchased. Payment for the Company’s contracts is due in full upon delivery. The customer agrees to a stated price implicit in the contract.

The transaction price relative to sales subject to a right of return reflects the amount of estimated consideration to which the Company expects to be entitled. This amount of variable consideration included in the transaction price, and measurement of net sales, is included in net sales only to the extent that it is probable that there will be no significant reversal in a future period. Actual amounts of consideration ultimately received may differ from the Company’s estimates. There were no material adjustments to the Company’s previous estimates. The allowance for sales returns is estimated based upon historical experience and a provision for estimated returns is recorded as a reduction in sales in the relevant period. The estimated right-of-return merchandise cost related to the sales returns is recorded as prepaid expense in the Company’s interim unaudited condensed consolidated balance sheet as of September 30, 2018. If actual results in the future vary from the Company’s estimates, the Company adjusts these estimates, which would affect net sales and earnings in the period such variances become known.

The Company has elected to apply the practical expedient, relative to e-commerce sales, which allows an entity to account for shipping and handling as fulfillment activities, and not a separate performance obligation. Accordingly, the Company recognizes revenue for only one performance obligation, the sale of the product, at shipping point (when the customer gains control). Revenue associated with e-commerce sales is not material.

Contract liabilities are recognized primarily for stored-value card sales. Cash received from the sale of stored-value cards is recorded as a contract liability in accrued expenses, and the Company recognizes revenue upon the customer’s redemption of the stored-value card. Stored-value card breakage is recognized as revenue in proportion to the pattern of customer redemptions by applying a historical breakage rate of five percent. The Company does not sell or provide stored-value cards that carry expiration dates.

The Company recognized approximately $1.6 million and $5.5 million in stored-value card redemption revenue for the 13 and 39 weeks ended September 30, 2018, respectively, and $1.6 million and $5.6 million for the 13 and 39 weeks ended October 1, 2017, respectively. The Company also recognized approximately $83,000 and $289,000 in stored-value card breakage revenue for the 13 and 39 weeks ended September 30, 2018, respectively, compared to approximately $111,000 and $334,000 in stored-value card breakage revenue for the 13 and 39 weeks ended October 1, 2017, respectively. The Company had outstanding stored-value card liabilities of $5.5 million and $7.4 million as of September 30, 2018 and December 31, 2017, respectively, which are included in accrued expenses. Stored-value card redemption and breakage revenue for the 13 and 39 weeks ended September 30, 2018 and stored-value card liability as of September 30, 2018 reported under ASC 606 were not materially different from amounts that would have been reported under the previous revenue guidance of ASC 605. The Company will continue to monitor future quarters for materiality. Based upon historical experience, stored-value cards are predominantly redeemed in the first two years following their issuance date.

The Company recorded, as prepaid expense, estimated right-of-return merchandise cost of $0.9 million related to estimated sales returns and recorded, as accrued expense, an allowance for sales returns reserve of $1.6 million as of September 30, 2018 under ASC 606, which would have been reported as a net liability of $0.7 million with no estimated right-of-return merchandise cost recorded as of September 30, 2018 under ASC 605.

Share-Based Compensation

The Company accounts for share-based compensation in accordance with ASC 718, Compensation—Stock Compensation. The Company recognizes compensation expense on a straight-line basis over the requisite service period using the fair-value method for share option awards, nonvested share awards and nonvested share unit awards granted with service-only conditions. See Note 10 to the Interim Financial Statements for a further discussion on share-based compensation.

Valuation of Merchandise Inventories, Net

The Company’s merchandise inventories are made up of finished goods and are valued at the lower of cost or net realizable value using the weighted-average cost method, which approximates the first-in, first-out (“FIFO”) method. Average cost includes the direct purchase price of merchandise inventory, net of certain vendor allowances and cash discounts, in-bound freight-related expense and allocated overhead expense associated with the Company’s distribution center.

Management regularly reviews inventories and records valuation reserves for damaged and defective merchandise, merchandise items with slow-moving or obsolescence exposure and merchandise that has a carrying value that exceeds net realizable value. Because of its merchandise mix, the Company has not historically experienced significant occurrences of obsolescence.

Inventory shrinkage is accrued as a percentage of merchandise sales based on historical inventory shrinkage trends. The Company performs physical inventories of its stores at least once per year and cycle counts inventories at its distribution center throughout the year. The reserve for inventory shrinkage primarily represents an estimate for inventory shrinkage for each store since the last physical inventory date through the reporting date.

These reserves are estimates, which could vary significantly, either favorably or unfavorably, from actual results if future economic conditions, consumer demand and competitive environments differ from expectations.

Valuation of Long-Lived Assets

The Company reviews long-lived assets for recoverability whenever events or changes in circumstances indicate that the carrying amount of an asset may be impaired.

Long-lived assets are reviewed for recoverability at the lowest level in which there are identifiable cash flows (“asset group”), usually at the store level. Each store typically requires net investments of approximately $0.5 million in long-lived assets to be held and used, subject to recoverability testing. The carrying amount of an asset group is not considered recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset group. If the asset group is determined not to be recoverable, then an impairment charge will be recognized in the amount by which the carrying amount of the asset group exceeds its fair value, determined using discounted cash flow valuation techniques, as defined in ASC 360, Property, Plant, and Equipment.

The Company determines the sum of the undiscounted cash flows expected to result from the asset group by projecting future revenue, gross margin and operating expense for each store under evaluation for impairment. The estimates of future cash flows involve management judgment and are based upon assumptions about expected future operating performance. Assumptions used in these forecasts are consistent with internal planning, and include assumptions about sales growth rates, gross margins and operating expense in relation to the current economic environment and future expectations, competitive factors in the various markets and inflation. The actual cash flows could differ from management’s estimates due to changes in business conditions, operating performance and economic conditions.

The Company recognized no impairment charges in the first nine months of fiscal 2018 or 2017.

Leases and Deferred Rent

The Company accounts for its leases under the provisions of ASC 840, Leases.

The Company evaluates and classifies its leases as either operating or capital leases for financial reporting purposes. Operating lease commitments consist principally of leases for the Company’s retail store facilities, distribution center, corporate office, IT systems hardware and distribution center delivery tractors. Capital lease obligations consist principally of leases for some of the Company’s IT systems hardware.

Certain of the leases for the Company’s retail store facilities provide for payments based on future sales volumes at the leased location, which are not measurable at the inception of the lease. These contingent rents are expensed as they accrue.

Deferred rent represents the difference between rent paid and the amounts expensed for operating leases. Certain leases have scheduled rent increases, and certain leases include an initial period of free or reduced rent as an inducement to enter into the lease agreement (“rent holidays”). The Company recognizes rent expense for rent increases and rent holidays on a straight-line basis over the term of the underlying leases, without regard to when rent payments are made. The calculation of straight-line rent begins on the possession date and extends through the “reasonably assured” lease term as defined in ASC 840 and may exceed the initial non-cancelable lease term.

Landlord allowances for tenant improvements, or lease incentives, are recorded as deferred rent and amortized on a straight-line basis over the “reasonably assured” lease term as a component of rent expense.

The Company evaluates its leases relative to asset retirement obligations, and determined these amounts to be immaterial.

Long-Term Debt

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Long-Term Debt

(5)	Long-Term Debt

On October 18, 2010, the Company, Big 5 Corp. and Big 5 Services Corp. entered into a credit agreement with Wells Fargo Bank, National Association (“Wells Fargo”), as administrative agent, and a syndicate of other lenders, which was amended on October 31, 2011 and December 19, 2013 (as so amended, the “Credit Agreement”). On September 29, 2017, the parties amended certain provisions of the Credit Agreement (such amendment, the “Third Amendment”), as further discussed below. The amendment represented a modification and resulted in the payment and capitalization of $0.2 million in deferred financing fees.

The Credit Agreement provides for a revolving credit facility (the “Credit Facility”) with an aggregate committed availability of up to $140.0 million, which amount may be increased at the Company’s option up to a maximum of $165.0 million. The Company may also request additional increases in aggregate availability, up to a maximum of $200.0 million, in which case the existing lenders under the Credit Agreement will have the option to increase their commitments to accommodate the requested increase. If such existing lenders do not exercise that option, the Company may (with the consent of Wells Fargo, not to be unreasonably withheld) seek other lenders willing to provide such commitments. The Third Amendment includes a provision which permits the Company to elect to reduce the aggregate committed availability under the Credit Agreement to $100.0 million for a three-month period each calendar year. Prior to the Third Amendment, the Credit Facility included a $50.0 million sublimit for issuances of letters of credit. The Third Amendment reduced the letter of credit sublimit to $25.0 million. The Credit Facility includes a $20.0 million sublimit for swingline loans.

The Company may borrow under the Credit Facility from time to time, provided the amounts outstanding will not exceed the lesser of the then aggregate availability (as discussed above) and the Borrowing Base (such lesser amount being referred to as the “Loan Cap”). The “Borrowing Base” generally is comprised of the sum, at the time of calculation, of (a) 90.00% of eligible credit card receivables; plus (b) the cost of eligible inventory (other than eligible in-transit inventory), net of inventory reserves, multiplied by 90.00% of the appraised net orderly liquidation value of eligible inventory (expressed as a percentage of the cost of eligible inventory); plus (c) the lesser of (i) the cost of eligible in-transit inventory, net of inventory reserves, multiplied by 90.00% of the appraised net orderly liquidation value of eligible in-transit inventory (expressed as a percentage of the cost of eligible in-transit inventory), or (ii) $10.0 million, minus (d) certain reserves established by Wells Fargo in its role as the Administrative Agent in its reasonable discretion.

Generally, the Company may designate specific borrowings under the Credit Facility as either base rate loans or LIBO rate loans. The applicable interest rate on the Company’s borrowings is a function of the daily average, over the preceding fiscal quarter, of the excess of the Loan Cap over amounts borrowed (such amount being referred to as the “Average Daily Availability”). Prior to the Third Amendment, those loans designated as LIBO rate loans bore interest at a rate equal to the then applicable LIBO rate plus an applicable margin as shown in the table below. Those loans designated as base rate loans bore interest at a rate equal to the applicable margin for base rate loans (as shown below) plus the highest of (a) the Federal funds rate, as in effect from time to time, plus one-half of one percent (0.50%), (b) the LIBO rate, as adjusted to account for statutory reserves, plus one percent (1.00%), or (c) the rate of interest in effect for such day as publicly announced from time to time by Wells Fargo as its “prime rate.” Prior to the Third Amendment, the applicable margin for all loans under the existing Credit Agreement was as set forth below as a function of Average Daily Availability for the preceding fiscal quarter.

Level	Average Daily Availability	LIBO Rate Applicable Margin		Base Rate Applicable Margin
I	Greater than or equal to $100,000,000		1.25%		0.25%
II	Less than $100,000,000 but greater than or equal to $40,000,000		1.50%		0.50%
III	Less than $40,000,000		1.75%		0.75%

Prior to the Third Amendment, the commitment fee assessed on the unused portion of the Credit Facility was 0.25% per annum.

After giving effect to the Third Amendment, those loans designated as LIBO rate loans bear interest at a rate equal to the applicable adjusted LIBO rate plus an applicable margin as shown in the table below. Those loans designated as base rate loans bear interest at a rate equal to the applicable margin for base rate loans (as shown below) plus the highest of (a) the Federal funds rate, as in effect from time to time, plus one-half of one percent (0.50%), (b) the LIBO rate, plus one percentage point (1.00%), or (c) the rate of interest in effect for such day as announced from time to time within Wells Fargo as its “prime rate.” The applicable margin for all loans are a function of Average Daily Availability for the preceding fiscal quarter as set forth below.

Level

Average Daily Availability

LIBO Rate

Applicable Margin

Base Rate

Applicable Margin

Greater than or equal to $70,000,000

1.25%

0.25%

Less than $70,000,000

1.375%

0.50%

After giving effect to the Third Amendment, the commitment fee assessed on the unused portion of the Credit Facility is 0.20% per annum.

Obligations under the Credit Facility are secured by a general lien and perfected security interest in substantially all of the Company’s assets. The Credit Agreement contains covenants that require the Company to maintain a fixed charge coverage ratio of not less than 1.0:1.0 in certain circumstances, and limit the ability to, among other things, incur liens, incur additional indebtedness, transfer or dispose of assets, change the nature of the business, guarantee obligations, pay dividends or make other distributions or repurchase stock, and make advances, loans or investments. The Company may declare or pay cash dividends or repurchase stock only if, among other things, no default or event of default then exists or would arise from such dividend or repurchase of stock and, after giving effect to such dividend or repurchase, certain availability and/or fixed charge coverage ratio requirements are satisfied. The Credit Agreement contains customary events of default, including, without limitation, failure to pay when due principal amounts with respect to the Credit Facility, failure to pay any interest or other amounts under the Credit Facility for five days after becoming due, failure to comply with certain agreements or covenants contained in the Credit Agreement, failure to satisfy certain judgments against the Company, failure to pay when due (or any other default which does or may lead to the acceleration of) certain other material indebtedness in principal amount in excess of $5.0 million, and certain insolvency and bankruptcy events.

The Third Amendment extended the maturity date of the Credit Agreement from December 19, 2018 to September 29, 2022. As of September 30, 2018, the Company had long-term revolving credit borrowings of $83.5 million and letter of credit commitments of $0.4 million outstanding, compared with borrowings of $45.0 million and letter of credit commitments of $0.5 million as of December 31, 2017. Total remaining borrowing availability, after subtracting letters of credit, was $56.1 million and $94.5 million as of September 30, 2018 and December 31, 2017, respectively.

Earnings Per Share

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

(7)	Earnings Per Share

The Company calculates earnings per share in accordance with ASC 260, Earnings Per Share, which requires a dual presentation of basic and diluted earnings per share. Basic earnings per share is calculated by dividing net income by the weighted-average shares of common stock outstanding, reduced by shares repurchased and held in treasury, during the period. Diluted earnings per share represents basic earnings per share adjusted to include the dilutive effect of outstanding share option awards, nonvested share awards and nonvested share unit awards.

The following table sets forth the computation of basic and diluted earnings per common share:

	13 Weeks Ended				39 Weeks Ended
	September 30, 2018		October 1, 2017		September 30, 2018		October 1, 2017
	(In thousands, except per share data)
Net income	$	3,115	$	5,950	$	1,558	$	14,054
Weighted-average shares of common stock outstanding:
Basic		20,990		21,324		20,972		21,584
Dilutive effect of common stock equivalents arising from share option, nonvested share and nonvested share unit awards		10		31		49		168
Diluted		21,000		21,355		21,021		21,752
Basic earnings per share	$	0.15	$	0.28	$	0.07	$	0.65
Diluted earnings per share	$	0.15	$	0.28	$	0.07	$	0.65
Antidilutive share option awards excluded from diluted calculation		316		64		268		90
Antidilutive nonvested share and nonvested share unit awards excluded from diluted calculation		466		381		239		135

The computation of diluted earnings per share for the 13 and 39 weeks ended September 30, 2018 and October 1, 2017 excludes share option awards that were outstanding and antidilutive (i.e., including such share option awards would result in higher earnings per share), since the exercise prices of these share option awards exceeded the average market price of the Company’s common shares. Additionally, the computation of diluted earnings per share for the periods presented excludes nonvested share awards and nonvested share unit awards that were outstanding and antidilutive, since the grant date fair values of these nonvested share awards and nonvested share unit awards exceeded the average market price of the Company’s common shares.

Share-based Compensation

9 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-based Compensation

(10)	Share-based Compensation

At its discretion, the Company grants share option awards, nonvested share awards and nonvested share unit awards to certain employees, as defined by ASC 718, Compensation—Stock Compensation, under the Company’s 2007 Equity and Performance Incentive Plan, as amended and restated in April 2011 and April 2016 (the “Amended 2007 Plan”), and accounts for its share-based compensation in accordance with ASC 718. The Company recognized $0.5 million and $1.7 million in share-based compensation expense for the 13 and 39 weeks ended September 30, 2018, respectively, compared to $0.6 million and $1.8 million in share-based compensation expense recognized for the 13 and 39 weeks ended October 1, 2017, respectively.

Share Option Awards

Share option awards granted by the Company generally vest and become exercisable in four equal annual installments of 25% per year with a maximum life of ten years. The exercise price of share option awards is equal to the quoted market price of the Company’s common stock on the date of grant. In the first nine months of fiscal 2018, the Company granted 254,900 share option awards with a weighted-average grant-date fair value of $1.23 per option. No share option awards were granted in the first nine months of fiscal 2017.

A summary of the status of the Company’s share option awards is presented below:

	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (In Years)		Aggregate Intrinsic Value
Outstanding at December 31, 2017		144,293		$	10.11
Granted		254,900			6.22
Exercised		(6,564	)		4.82
Forfeited or Expired		(25,819	)		9.50
Outstanding at September 30, 2018		366,810		$	7.55		7.33	$	14,185
Exercisable at September 30, 2018		112,535		$	10.37		2.68	$	14,185
Vested and Expected to Vest at September 30, 2018		359,164		$	7.58		7.29	$	14,185

The aggregate intrinsic value in the preceding table represents the total pretax intrinsic value, based upon the Company’s most recent closing stock price of $5.10 as of September 30, 2018, which would have been received by the option holders had all option holders exercised their option awards as of that date.

The total intrinsic value of share option awards exercised for the 39 weeks ended September 30, 2018 and October 1, 2017 was approximately $10,000 and $79,000, respectively. The total cash received from employees as a result of employee share option award exercises for the 39 weeks ended September 30, 2018 and October 1, 2017 was approximately $31,000 and $67,000, respectively. The actual tax benefit realized for the tax deduction from share option award exercises of share-based compensation awards in the 39 weeks ended September 30, 2018 and October 1, 2017 totaled $3,000 and $31,000, respectively.

The fair value of each share option award on the date of grant is estimated using the Black-Scholes method based on the following weighted-average assumptions:

	39 Weeks Ended
	September 30, 2018			October 1, 2017
Risk-free interest rate		2.6	%		—
Expected term	5.1 years				—
Expected volatility		48.0	%		—
Expected dividend yield		9.5	%		—

The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected term of the option award; the expected term represents the weighted-average period of time that option awards granted are expected to be outstanding giving consideration to vesting schedules and historical participant exercise behavior; the expected volatility is based upon historical volatility of the Company’s common stock; and the expected dividend yield is based upon the Company’s current dividend rate.

As of September 30, 2018, there was $0.3 million of total unrecognized compensation expense related to nonvested share option awards granted. That expense is expected to be recognized over a weighted-average period of 3.4 years.

Nonvested Share Awards and Nonvested Share Unit Awards

Nonvested share awards and nonvested share unit awards granted by the Company vest for employees from the date of grant in four equal annual installments of 25% per year. Nonvested share awards and nonvested share unit awards granted by the Company to non-employee directors for their service as directors, as defined by ASC 718, vest 100% on the earlier of (a) the date of the Company’s next annual stockholders meeting following the grant date or (b) the first anniversary of the grant date.

Nonvested share awards are delivered to the recipient upon their vesting. With respect to nonvested share unit awards, vested shares, including any dividend reinvestments, will be delivered to the recipient on the tenth business day of January following the year in which the recipient’s service to the Company is terminated. The total fair value of nonvested share awards which vested during the first nine months of fiscal 2018 and 2017 was $1.0 million and $2.0 million, respectively. The total fair value of nonvested share unit awards which vested during the first nine months of fiscal 2018 and 2017 was $0.3 million and $0.3 million, respectively.

The Company granted 213,062 and 191,000 nonvested share awards in the first nine months of fiscal 2018 and 2017, respectively. The weighted-average grant-date fair value per share of the Company’s nonvested share awards granted in the first nine months of fiscal 2018 and 2017 was $6.99 and $14.88, respectively.

A summary of the status of the Company’s nonvested share awards is presented below:

	Shares			Weighted- Average Grant- Date Fair Value
Balance at December 31, 2017		377,035		$	13.61
Granted		213,062			6.99
Vested		(144,205	)		13.66
Forfeited		(7,420	)		11.42
Balance at September 30, 2018		438,472		$	10.42

To satisfy employee minimum statutory tax withholding requirements for nonvested share awards that vest, the Company withholds and retires a portion of the vesting common shares, unless an employee elects to pay cash. In the first nine months of fiscal 2018, the Company withheld 53,343 common shares with a total value of $0.4 million. This amount is presented as a cash outflow from financing activities in the accompanying interim unaudited condensed consolidated statement of cash flows.

The Company granted 34,884 and 21,000 nonvested share unit awards in the first nine months of fiscal 2018 and 2017, respectively. The weighted-average grant-date fair value of the Company’s nonvested share unit awards granted in the first nine months of fiscal 2018 and 2017 was $8.60 and $13.90, respectively.

A summary of the status of the Company’s nonvested share unit awards is presented below:

	Units			Weighted- Average Grant- Date Fair Value
Balance at December 31, 2017		23,250		$	12.82
Granted		34,884			8.60
Vested		(23,250	)		13.71
Forfeited		(8,721	)		8.60
Balance at September 30, 2018		26,163		$	7.81

As of September 30, 2018, there was $3.5 million and $0.2 million of total unrecognized compensation expense related to nonvested share awards and nonvested share unit awards, respectively. That expense is expected to be recognized over a weighted-average period of 2.5 years and 0.7 years for nonvested share awards and nonvested share unit awards, respectively.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Consolidation

Reporting Period

Recently Adopted Accounting Updates

Recently Issued Accounting Updates

Other recently issued accounting updates are not expected to have a material impact on the Company’s consolidated financial statements.

Use of Estimates

Revenue Recognition

	13 Weeks Ended				39 Weeks Ended
	September 30, 2018		October 1, 2017		September 30, 2018		October 1, 2017
	(In thousands)
Hard goods	$	145,822	$	147,525	$	379,288	$	391,236
Athletic and sport apparel		45,111		44,425		146,147		151,503
Athletic and sport footwear		74,128		77,124		210,679		219,095
Other sales		1,290		1,397		4,366		4,912
Net sales	$	266,351	$	270,471	$	740,480	$	766,746

Substantially all of the Company’s revenue is for single performance obligations for the following distinct items:

•

Retail store sales

•

E-commerce sales

•

Stored-value cards

Share-Based Compensation

Valuation of Merchandise Inventories, Net

Valuation of Long-Lived Assets

The Company reviews long-lived assets for recoverability whenever events or changes in circumstances indicate that the carrying amount of an asset may be impaired.

The Company recognized no impairment charges in the first nine months of fiscal 2018 or 2017.

Leases and Deferred Rent

The Company accounts for its leases under the provisions of ASC 840, Leases.

The Company evaluates its leases relative to asset retirement obligations, and determined these amounts to be immaterial.

Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Common Share

The following table sets forth the computation of basic and diluted earnings per common share:

	13 Weeks Ended				39 Weeks Ended
	September 30, 2018		October 1, 2017		September 30, 2018		October 1, 2017
	(In thousands, except per share data)
Net income	$	3,115	$	5,950	$	1,558	$	14,054
Weighted-average shares of common stock outstanding:
Basic		20,990		21,324		20,972		21,584
Dilutive effect of common stock equivalents arising from share option, nonvested share and nonvested share unit awards		10		31		49		168
Diluted		21,000		21,355		21,021		21,752
Basic earnings per share	$	0.15	$	0.28	$	0.07	$	0.65
Diluted earnings per share	$	0.15	$	0.28	$	0.07	$	0.65
Antidilutive share option awards excluded from diluted calculation		316		64		268		90
Antidilutive nonvested share and nonvested share unit awards excluded from diluted calculation		466		381		239		135

Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Share Option Awards

A summary of the status of the Company’s share option awards is presented below:

	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (In Years)		Aggregate Intrinsic Value
Outstanding at December 31, 2017		144,293		$	10.11
Granted		254,900			6.22
Exercised		(6,564	)		4.82
Forfeited or Expired		(25,819	)		9.50
Outstanding at September 30, 2018		366,810		$	7.55		7.33	$	14,185
Exercisable at September 30, 2018		112,535		$	10.37		2.68	$	14,185
Vested and Expected to Vest at September 30, 2018		359,164		$	7.58		7.29	$	14,185

Weighted-Average Assumptions Used to Estimate the Fair Value of Each Share Option Award

The fair value of each share option award on the date of grant is estimated using the Black-Scholes method based on the following weighted-average assumptions:

	39 Weeks Ended
	September 30, 2018			October 1, 2017
Risk-free interest rate		2.6	%		—
Expected term	5.1 years				—
Expected volatility		48.0	%		—
Expected dividend yield		9.5	%		—

Summary of Nonvested Share Awards Activity

A summary of the status of the Company’s nonvested share awards is presented below:

	Shares			Weighted- Average Grant- Date Fair Value
Balance at December 31, 2017		377,035		$	13.61
Granted		213,062			6.99
Vested		(144,205	)		13.66
Forfeited		(7,420	)		11.42
Balance at September 30, 2018		438,472		$	10.42

A summary of the status of the Company’s nonvested share unit awards is presented below:

	Units			Weighted- Average Grant- Date Fair Value
Balance at December 31, 2017		23,250		$	12.82
Granted		34,884			8.60
Vested		(23,250	)		13.71
Forfeited		(8,721	)		8.60
Balance at September 30, 2018		26,163		$	7.81

Summary of Significant Accounting Policies - Additional Information (Detail)		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 02, 2018 USD ($)	Sep. 30, 2018 USD ($)	Oct. 01, 2017 USD ($)	Sep. 30, 2018 USD ($) Segment Obligation	Oct. 01, 2017 USD ($)	Dec. 31, 2017 USD ($)
Accounting Policies [Line Items]
Reporting period, minimum				364 days
Reporting period, maximum				371 days
Increase to retained earnings, net of tax due to the cumulative effect related to the change in accounting for stored value card breakage				$ 575,000
Number of reportable segment \| Segment				1
Number of performance obligation \| Obligation				1
Percentage of gift card historical breakage rate				5.00%
Stored value card redemption revenue recognized		$ 1,600,000	$ 1,600,000	$ 5,500,000	$ 5,600,000
Outstanding stored value card liabilities		5,500,000		$ 5,500,000		$ 7,400,000
Stored value cards redeemed period				2 years
Long-lived assets to be held and used		500,000		$ 500,000
Impairment charges				0	0
Stored Value Card Breakage Revenue [Member]
Accounting Policies [Line Items]
Recognized stored value card breakage revenue		83,000	$ 111,000	289,000	$ 334,000
ASC 605 [Member] \| Merchandise Member]
Accounting Policies [Line Items]
Estimated right of return net liability		700,000		700,000
Estimated right of returns net		$ 0		0
ASU No. 2014-09 [Member] \| ASC 606 [Member]
Accounting Policies [Line Items]
Increase to retained earnings, net of tax due to the cumulative effect related to the change in accounting for stored value card breakage	$ 600,000
ASU No. 2014-09 [Member] \| ASC 606 [Member] \| Merchandise Member]
Accounting Policies [Line Items]
Estimated right of return related to estimated sales returns	$ 1,300,000			900,000
Allowance for sales returns reserve				$ 1,600,000
First Quarter [Member]
Accounting Policies [Line Items]
Interim reporting periods				91 days		91 days
Second Quarter [Member]
Accounting Policies [Line Items]
Interim reporting periods				91 days		91 days
Third Quarter [Member]
Accounting Policies [Line Items]
Interim reporting periods				91 days		91 days
Fourth Quarter [Member]
Accounting Policies [Line Items]
Interim reporting periods				91 days		91 days

Long-Term Debt - Additional Information (Detail) - USD ($)		9 Months Ended
	Sep. 29, 2017	Sep. 30, 2018	Oct. 01, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Credit Agreement description		On October 18, 2010, the Company, Big 5 Corp. and Big 5 Services Corp. entered into a credit agreement with Wells Fargo Bank, National Association (“Wells Fargo”), as administrative agent, and a syndicate of other lenders, which was amended on October 31, 2011 and December 19, 2013 (as so amended, the “Credit Agreement”). On September 29, 2017, the parties amended certain provisions of the Credit Agreement (such amendment, the “Third Amendment”), as further discussed below. The amendment represented a modification and resulted in the payment and capitalization of $0.2 million in deferred financing fees.
Payment in deferred financing fees			$ 140,000
Revolving credit facility		$ 140,000,000
First tier of increase to the borrowing capacity		165,000,000
Maximum limit of credit facility		200,000,000
Sublimit for issuances of letters of credit		50,000,000
Sublimit for swingline loans		$ 20,000,000
Percentage of eligible credit card accounts receivables		90.00%
Percentage of the value of eligible inventory		90.00%
Percentage of the value of eligible in-transit inventory		90.00%
Eligible in-transit inventory threshold		$ 10,000,000
Debt instrument, covenant description		Obligations under the Credit Facility are secured by a general lien and perfected security interest in substantially all of the Company’s assets. The Credit Agreement contains covenants that require the Company to maintain a fixed charge coverage ratio of not less than 1.0:1.0 in certain circumstances, and limit the ability
Events of default, description		The Credit Agreement contains customary events of default, including, without limitation, failure to pay when due principal amounts with respect to the Credit Facility, failure to pay any interest or other amounts under the Credit Facility for five days after becoming due, failure to comply with certain agreements or covenants contained in the Credit Agreement, failure to satisfy certain judgments against the Company, failure to pay when due (or any other default which does or may lead to the acceleration of) certain other material indebtedness in principal amount in excess of $5.0 million, and certain insolvency and bankruptcy events.
Line of Credit Facility default debt minimum amount		$ 5,000,000
Maturity date of Credit Agreement		Dec. 19, 2018
Long-term borrowings		$ 83,523,000		$ 45,000,000
Letter of credit commitments		400,000		500,000
Revolving Credit Borrowings [Member]
Debt Instrument [Line Items]
Long-term borrowings		$ 83,500,000		45,000,000
Third Amendment to Credit Agreement [Member]
Debt Instrument [Line Items]
Maturity date of Credit Agreement		Sep. 29, 2022
Minimum [Member]
Debt Instrument [Line Items]
Fixed charge coverage ratio		100.00%
First Amendment to Credit Agreement [Member]
Debt Instrument [Line Items]
Credit agreement amendment date		Oct. 31, 2011
Second Amendment to Credit Agreement [Member]
Debt Instrument [Line Items]
Credit agreement amendment date		Dec. 19, 2013
Interest rate, description		the applicable margin for base rate loans (as shown below) plus the highest of (a) the Federal funds rate, as in effect from time to time, plus one-half of one percent (0.50%), (b) the LIBO rate, as adjusted to account for statutory reserves, plus one percent (1.00%), or (c) the rate of interest in effect for such day as publicly announced from time to time by Wells Fargo as its “prime rate.”
Commitment fee assessed		0.25%
Second Amendment to Credit Agreement [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Applicable margin in addition to variable rate		0.50%
Second Amendment to Credit Agreement [Member] \| LIBO Rate [Member]
Debt Instrument [Line Items]
Applicable margin in addition to variable rate		1.00%
Third Amendment to Credit Agreement [Member]
Debt Instrument [Line Items]
Credit agreement amendment date		Sep. 29, 2017
Payment in deferred financing fees	$ 200,000
Capitalization in deferred financing fees	$ 200,000
Revolving credit facility		$ 100,000,000
Sublimit for issuances of letters of credit		$ 25,000,000
Interest rate, description		the applicable margin for base rate loans (as shown below) plus the highest of (a) the Federal funds rate, as in effect from time to time, plus one-half of one percent (0.50%), (b) the LIBO rate, plus one percentage point (1.00%), or (c) the rate of interest in effect for such day as announced from time to time within Wells Fargo as its “prime rate.”
Commitment fee assessed		0.20%
Third Amendment to Credit Agreement [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Applicable margin in addition to variable rate		0.50%
Third Amendment to Credit Agreement [Member] \| LIBO Rate [Member]
Debt Instrument [Line Items]
Applicable margin in addition to variable rate		1.00%
Wells Fargo Bank National Association [Member]
Debt Instrument [Line Items]
Remaining borrowing availability		$ 56,100,000		$ 94,500,000

Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Earnings Per Share Basic [Line Items]
Net income	$ 3,115	$ 5,950	$ 1,558	$ 14,054
Weighted-average shares of common stock outstanding:
Basic	20,990	21,324	20,972	21,584
Dilutive effect of common stock equivalents arising from share option, nonvested share and nonvested share unit awards	10	31	49	168
Diluted	21,000	21,355	21,021	21,752
Basic earnings per share	$ 0.15	$ 0.28	$ 0.07	$ 0.65
Diluted earnings per share	$ 0.15	$ 0.28	$ 0.07	$ 0.65
Share Option Awards [Member]
Weighted-average shares of common stock outstanding:
Antidilutive shares/unit awards excluded from diluted calculation	316	64	268	90
Nonvested Share Awards and Nonvested Share Unit Awards [Member]
Weighted-average shares of common stock outstanding:
Antidilutive shares/unit awards excluded from diluted calculation	466	381	239	135

Share-based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense	$ 500,000	$ 600,000	$ 1,700,000	$ 1,800,000
Granted, shares			254,900
Proceeds from exercise of share option awards			$ 31,000	67,000
Shares withheld for tax requirements			53,343
Tax withholding payments for share-based compensation			$ 366,000	805,000
Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Closing stock price per share	$ 5.10		$ 5.10
Tax withholding payments for share-based compensation			$ 1,000	$ 1,000
Share Option Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum expiration period of share based payment awards granted			10 years
Granted, shares			254,900	0
Weighted-average grant-date fair value per share			$ 1.23
Intrinsic value of share option awards exercised			$ 10,000	$ 79,000
Proceeds from exercise of share option awards			31,000	67,000
Tax benefit realized for the expected tax deduction from share option award exercises			3,000	31,000
Unrecognized compensation expense	$ 300,000		$ 300,000
Weighted-average period of recognition			3 years 4 months 24 days
Share Option Awards [Member] \| Share-based Compensation Award, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rights (as percentage)			25.00%
Performance Shares [Member] \| Share-based Compensation Award, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rights (as percentage)			25.00%
Performance Shares [Member] \| Share-based Compensation Award, Tranche One [Member] \| Non-Employee Directors [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rights (as percentage)			100.00%
Nonvested Share Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average period of recognition			2 years 6 months
Fair value of nonvested share awards			$ 1,000,000	$ 2,000,000
Issuance of nonvested share awards, Shares			213,062	191,000
Weighted-average grant-date fair value per share, granted			$ 6.99	$ 14.88
Unrecognized compensation expenses	3,500,000		$ 3,500,000
Nonvested Share Unit Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average period of recognition			8 months 12 days
Fair value of nonvested share awards			$ 300,000	$ 300,000
Issuance of nonvested share awards, Shares			34,884	21,000
Weighted-average grant-date fair value per share, granted			$ 8.60	$ 13.90
Unrecognized compensation expenses	$ 200,000		$ 200,000

Share-Based Compensation - Summary of Share Option Awards (Detail)	9 Months Ended
	Sep. 30, 2018 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Outstanding at December 31, 2017 \| shares	144,293
Shares, Granted \| shares	254,900
Shares, Exercised \| shares	(6,564)
Shares, Forfeited or Expired \| shares	(25,819)
Shares, Outstanding at September 30, 2018 \| shares	366,810
Shares, Exercisable at September 30, 2018 \| shares	112,535
Shares, Vested and Expected to Vest at September 30, 2018 \| shares	359,164
Weighted-Average Exercise Price, Outstanding at December 31, 2017 \| $ / shares	$ 10.11
Weighted-Average Exercise Price, Granted \| $ / shares	6.22
Weighted-Average Exercise Price, Exercised \| $ / shares	4.82
Weighted-Average Exercise Price, Forfeited or Expired \| $ / shares	9.50
Weighted-Average Exercise Price, Outstanding at September 30, 2018 \| $ / shares	7.55
Weighted-Average Exercise Price, Exercisable at September 30, 2018 \| $ / shares	10.37
Weighted-Average Exercise Price, Vested and Expected to Vest at September 30, 2018 \| $ / shares	$ 7.58
Weighted-Average Remaining Contractual Life (In Years), Outstanding at September 30, 2018	7 years 3 months 29 days
Weighted-Average Remaining Contractual Life (In Years), Exercisable at September 30, 2018	2 years 8 months 4 days
Weighted-Average Remaining Contractual Life (In Years), Vested and Expected to Vest at September 30, 2018	7 years 3 months 14 days
Aggregate Intrinsic Value, Outstanding at September 30, 2018 \| $	$ 14,185
Aggregate Intrinsic Value, Exercisable at September 30, 2018 \| $	14,185
Aggregate Intrinsic Value, Vested and Expected to Vest at September 30, 2018 \| $	$ 14,185

Share-based Compensation - Summary of Nonvested Share Awards Activity (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017
Nonvested Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested shares/share units, beginning balance	377,035
Granted, shares/share units	213,062	191,000
Vested, shares/share units	(144,205)
Forfeited, shares/share units	(7,420)
Nonvested shares/share units, ending balance	438,472
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Grant-Date Fair Value, Beginning Balance	$ 13.61
Weighted-Average Grant-Date Fair Value, Granted	6.99	$ 14.88
Weighted-Average Grant-Date Fair Value, Vested	13.66
Weighted-Average Grant-Date Fair Value, Forfeited	11.42
Weighted-Average Grant-Date Fair Value, Ending Balance	$ 10.42
Nonvested Share Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested shares/share units, beginning balance	23,250
Granted, shares/share units	34,884	21,000
Vested, shares/share units	(23,250)
Forfeited, shares/share units	(8,721)
Nonvested shares/share units, ending balance	26,163
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Grant-Date Fair Value, Beginning Balance	$ 12.82
Weighted-Average Grant-Date Fair Value, Granted	8.60	$ 13.90
Weighted-Average Grant-Date Fair Value, Vested	13.71
Weighted-Average Grant-Date Fair Value, Forfeited	8.60
Weighted-Average Grant-Date Fair Value, Ending Balance	$ 7.81

Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable, current	$ 38	$ 79
Accumulated amortization on other assets	$ 1,715	$ 1,575
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	25,078,487	24,919,624
Common stock, shares outstanding	21,428,274	21,345,159
Treasury stock, shares	3,650,213	3,574,465

Description of Business - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2018 ft² Store Segment
Description Of Business [Line Items]
Number of operating stores \| Store	436
Area of traditional sporting goods store \| ft²	11,000
Number of reportable segment \| Segment	1
Big 5 Corp [Member]
Description Of Business [Line Items]
Subsidiary interest ownership percentage	100.00%
Big 5 Service Corp [Member]
Description Of Business [Line Items]
Subsidiary interest ownership percentage	100.00%

Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Payables And Accruals [Abstract]
Payroll and related expense	$ 20,961	$ 23,670
Occupancy expense	11,462	10,005
Sales tax	7,581	9,674
Other	21,471	24,877
Accrued expenses	$ 61,475	$ 68,226

Income Taxes - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Write-off of deferred tax assets related to share based compensation	$ 200,000
Unrecognized tax benefits	$ 0	$ 0
Unrecognized tax benefits, period	Over the next 12 months
Accrued interest or penalties	$ 0	0
Earliest Tax Year [Member] \| Federal [Member]
Income Tax Contingency [Line Items]
Income tax returns in period	2015
Earliest Tax Year [Member] \| State and Local [Member]
Income Tax Contingency [Line Items]
Income tax returns in period	2013
California Enterprise Zone Tax Credits [Member]
Income Tax Contingency [Line Items]
Deferred tax assets valuation allowance	$ 900,000	$ 900,000
Tax credits carry forward latest expiration year	2024

Commitments and Contingencies - Additional Information (Detail) - USD ($)		9 Months Ended
	Oct. 11, 2018	Sep. 30, 2018	Oct. 01, 2017
Commitments And Contingencies [Line Items]
Lease amendment description		In November 2017, the Company entered into an amendment to a lease for a parcel of land with an existing building adjacent to its corporate headquarters location, including a parking lot currently used by the Company (the “premises”) concurrently with entering into a purchase and sale agreement. Pursuant to the purchase and sale agreement, the Company had the right to purchase the premises for $4.5 million. The purchase and sale agreement’s due diligence period expired on March 2, 2018, and in connection therewith, the Company paid an escrow deposit of $300,000 applied towards the purchase price of the property. The closing of the sale was scheduled to occur on or before November 27, 2018, subject to seller’s right to elect an earlier closing date. On October 11, 2018, the Company completed the purchase of the premises for $4.5 million and terminated the lease concurrently therewith.
Purchase the premises		$ 4,500,000
Due diligence expiration date		Mar. 02, 2018
Escrow deposit to purchase price of the property		$ 300,000
Sale agreement termination, date		November 27, 2018
Purchase of the premises		$ 8,448,000	$ 11,374,000
Subsequent Event [Member] \| Premises [Member]
Commitments And Contingencies [Line Items]
Purchase of the premises	$ 4,500,000

Long-Term Debt - Average Daily Excess Availability for Preceding Fiscal Quarter (Detail)	9 Months Ended
	Sep. 30, 2018
Second Amendment to Credit Agreement [Member] \| Level I [Member]
Line Of Credit Facility [Line Items]
Average Daily Availability	Greater than or equal to $100,000,000
LIBO Rate Applicable Margin	1.25%
Base Rate Applicable Margin	0.25%
Second Amendment to Credit Agreement [Member] \| Level II [Member]
Line Of Credit Facility [Line Items]
Average Daily Availability	Less than $100,000,000 but greater than or equal to $40,000,000
LIBO Rate Applicable Margin	1.50%
Base Rate Applicable Margin	0.50%
Second Amendment to Credit Agreement [Member] \| Level III [Member]
Line Of Credit Facility [Line Items]
Average Daily Availability	Less than $40,000,000
LIBO Rate Applicable Margin	1.75%
Base Rate Applicable Margin	0.75%
Third Amendment to Credit Agreement [Member] \| Level I [Member]
Line Of Credit Facility [Line Items]
Average Daily Availability	Greater than or equal to $70,000,000
LIBO Rate Applicable Margin	1.25%
Base Rate Applicable Margin	0.25%
Third Amendment to Credit Agreement [Member] \| Level II [Member]
Line Of Credit Facility [Line Items]
Average Daily Availability	Less than $70,000,000
LIBO Rate Applicable Margin	1.375%
Base Rate Applicable Margin	0.50%

Related Party Transaction - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 01, 2017	Oct. 01, 2017
Related Party Transactions [Abstract]
Net Recovery of short swing profits	$ 100	$ 136
Related legal fees and taxes		200
Proceeds from disgorgement of stockholder's short-swing profits		$ 346

Subsequent Event - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	9 Months Ended
	Oct. 11, 2018	Dec. 30, 2018	Sep. 30, 2018	Oct. 01, 2017
Subsequent Event [Line Items]
Purchase of previously-leased parcel of land and existing building			$ 8,448	$ 11,374
Subsequent Event [Member] \| Land and Building [Member]
Subsequent Event [Line Items]
Purchase of previously-leased parcel of land and existing building	$ 4,500
Scenario Forecast [Member]
Subsequent Event [Line Items]
Dividend per share		$ 0.05
Dividend declared per share, payable date		Dec. 14, 2018
Dividend declared per share, record date		Nov. 30, 2018