Document and Entity Information Document - shares	9 Months Ended
	Oct. 31, 2015	Dec. 01, 2015
Document Information [Line Items]
Entity Registrant Name	BEST BUY CO INC
Entity Central Index Key	0000764478
Document Type	10-Q
Document Period End Date	Oct. 31, 2015
Amendment Flag	false
Current Fiscal Year End Date	--01-30
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		342,719,728
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3