Document and Entity Information Document	6 Months Ended
	Aug. 04, 2012	Aug. 31, 2012
Document Information [Line Items]
Entity Registrant Name	BEST BUY CO INC
Current Fiscal Year End Date	--02-02
Document Fiscal Year Focus	2013
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		336,667,475
Document Fiscal Period Focus	Q2
Document Type	10-Q
Entity Central Index Key	0000764478
Document Period End Date	Aug. 04, 2012
Entity Filer Category	Large Accelerated Filer