Document and Entity Information Document - shares	6 Months Ended
	Jul. 30, 2016	Aug. 30, 2016
Document Information [Line Items]
Entity Registrant Name	BEST BUY CO INC
Entity Central Index Key	0000764478
Document Type	10-Q
Document Period End Date	Jul. 30, 2016
Amendment Flag	false
Current Fiscal Year End Date	--01-28
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		317,274,411
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2