Document And Entity Information
6 Months Ended
Jun. 30, 2013
Aug. 02, 2013
Document and Entity Information [Abstract]    
Entity Registrant Name BUFFALO WILD WINGS INC  
Document Type 10-Q  
Current Fiscal Year End Date --12-29  
Entity Common Stock, Shares Outstanding   18,777,821
Amendment Flag false  
Entity Central Index Key 0001062449  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Large Accelerated Filer  
Entity Well-known Seasoned Issuer Yes  
Document Period End Date Jun. 30, 2013  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q2