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Summary of Significant Accounting Policies - Fiscal Year (Details)	12 Months Ended
	Jan. 28, 2017
Fiscal Year [Abstract]
Number of Weeks in Fiscal Period	52

X

- References

No definition available.

+ Details

Name:	bby_FiscalYearAbstract
Namespace Prefix:	bby_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of Weeks in Fiscal Period

+ References

No definition available.

+ Details

Name:	bby_NumberofWeeksinFiscalPeriod
Namespace Prefix:	bby_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration