Document and Entity Information (USD $) In Billions, except Share data, unless otherwise specified	11 Months Ended
	Feb. 02, 2013	Mar. 21, 2013	Aug. 04, 2012
Document and Entity Information [Abstract}
Entity Registrant Name	BEST BUY CO INC
Current Fiscal Year End Date	--02-02
Entity Voluntary Filers	No
Document Fiscal Year Focus	2013
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding		338,770,740
Entity Public Float			$ 4.1
Document Fiscal Period Focus	FY
Document Type	10-KT
Entity Central Index Key	0000764478
Document Period End Date	Feb. 02, 2013
Entity Filer Category	Large Accelerated Filer