Document And Entity Information
9 Months Ended
Sep. 28, 2014
Oct. 31, 2014
Document and Entity Information [Abstract]    
Entity Registrant Name BUFFALO WILD WINGS INC  
Document Type 10-Q  
Current Fiscal Year End Date --12-28  
Entity Common Stock, Shares Outstanding   18,926,231
Amendment Flag false  
Entity Central Index Key 0001062449  
Entity Filer Category Large Accelerated Filer  
Entity Well-known Seasoned Issuer Yes  
Document Period End Date Sep. 28, 2014  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q3  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes