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Description of Business	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Description of Business	(1) Description of Business The accompanying consolidated financial statements as of December 31, 2017 and January 1, 2017 and for the years ended December 31, 2017 (“fiscal 2017”), January 1, 2017 (“fiscal 2016”) and January 3, 2016 (“fiscal 2015”) represent the financial position, results of operations and cash flows of Big 5 Sporting Goods Corporation (the “Company”) and its 100%-owned subsidiary, Big 5 Corp., and Big 5 Corp.’s 100%-owned subsidiary, Big 5 Services Corp.  The Company is a leading sporting goods retailer in the western United States, operating 435 stores and an e-commerce platform as of December 31, 2017. The Company operates as one reportable segment under the “Big 5 Sporting Goods” name and provides a full-line product offering in a traditional sporting goods store format that averages approximately 11,000 square feet. The Company’s product mix includes athletic shoes, apparel and accessories, as well as a broad selection of outdoor and athletic equipment for team sports, fitness, camping, hunting, fishing, tennis, golf, winter and summer recreation and roller sports.

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- References

No definition available.

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- Definition

The entire disclosure for the business description and basis of presentation concepts. Business description describes the nature and type of organization including but not limited to organizational structure as may be applicable to holding companies, parent and subsidiary relationships, business divisions, business units, business segments, affiliates and information about significant ownership of the reporting entity. Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-URI http://asc.fasb.org/topic&trid=2122149

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-URI http://asc.fasb.org/topic&trid=2134479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-URI http://asc.fasb.org/topic&trid=2122369

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