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Document and Entity Information - shares
 9 Months Ended
Oct. 02, 2016
Oct. 26, 2016
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Oct. 02, 2016  
Document Fiscal Year Focus 2016  
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 --01-01  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   21,895,236