Document and Entity Information Document - shares	3 Months Ended
	May 05, 2018	Jun. 05, 2018
Document Information [Line Items]
Entity Registrant Name	BEST BUY CO INC
Entity Central Index Key	0000764478
Document Type	10-Q
Document Period End Date	May 05, 2018
Amendment Flag	false
Current Fiscal Year End Date	--02-02
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		279,391,918
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1