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Shareholders' Equity Share-based Payment Award, Award Vesting Period (Details) - Time-Based Share Awards [Member] | 12 Months Ended
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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%

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Annual Vesting Percentage + References No definition available. + Details
Name: | bby_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsAnnualVestingPercentage
Namespace Prefix: | bby_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition 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. + References No definition available. + Details
Name: | bby_ShareBasedPaymentAwardAwardVestingPeriodMaximum
Namespace Prefix: | bby_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum 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. + References No definition available. + Details
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Namespace Prefix: | bby_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AwardTypeAxis=bby_TimeBasedShareAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |