Shareholders' Equity Share-based Payment Award, Award Vesting Period (Details) - Time-Based Share Awards [Member]	12 Months Ended
Jan. 28, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Award, Award Vesting Period, Minimum	3 years
Share-based Payment Award, Award Vesting Period, Maximum	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Annual Vesting Percentage	25.00%

Maximum period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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