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Document and Entity Information (USD $)
 12 Months Ended
Jan. 01, 2012
Feb. 23, 2012
Jul. 03, 2011
Document and Entity Information [Abstract]      
Entity Registrant Name BIG 5 SPORTING GOODS CORP    
Entity Central Index Key 0001156388    
Document Type 10-K    
Document Period End Date Jan. 01, 2012    
Amendment Flag false    
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --01-01    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 139,031,310
Entity Common Stock, Shares Outstanding   21,750,520