Document and Entity Information (USD $) In Billions, except Share data, unless otherwise specified	12 Months Ended
	Mar. 03, 2012	Apr. 26, 2012	Aug. 27, 2011
Document and Entity Information [Abstract}
Entity Registrant Name	BEST BUY CO INC
Current Fiscal Year End Date	--03-03
Entity Voluntary Filers	No
Document Fiscal Year Focus	2012
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding		342,198,524
Entity Public Float			$ 6.6
Document Fiscal Period Focus	FY
Document Type	10-K
Entity Central Index Key	0000764478
Document Period End Date	Mar. 03, 2012
Entity Filer Category	Large Accelerated Filer