Basis of Presentation (Details)	9 Months Ended
Nov. 01, 2014	Nov. 02, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of weeks in fiscal period	P39W	P39W
Reporting period lag for consolidation of financial results	1 month

Reporting Lag for Certain Foreign Operations in Financial Statements

No definition available.

Name:	bby_ReportingLagForCertainForeignOperationsInFinancialStatements
Namespace Prefix:	bby_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration