Document And Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 25, 2016	Feb. 09, 2017	Jun. 26, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	BUFFALO WILD WINGS INC
Entity Central Index Key	0001062449
Current Fiscal Year End Date	--12-25
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 25, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		17,389,630
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 2.6