Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Jan. 30, 2016	Mar. 21, 2016	Aug. 01, 2015
Document and Entity Information [Abstract}
Entity Registrant Name	BEST BUY CO INC
Current Fiscal Year End Date	--01-30
Entity Voluntary Filers	No
Document Fiscal Year Focus	2016
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding		323,347,681
Entity Public Float			$ 6.6
Document Fiscal Period Focus	FY
Document Type	10-K
Entity Central Index Key	0000764478
Document Period End Date	Jan. 30, 2016
Entity Filer Category	Large Accelerated Filer