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Summary of Significant Accounting Policies - Foreign Currency (Details) | 12 Months Ended
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Jan. 28, 2017
Accounting Policies [Abstract] |
Prior Period Foreign Currency Exchange Rate, Used to Align Operations Reported | 1 month

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- Definition This element represents the use of prior months' foreign currency exchange rate to align operations reported. + References No definition available. + Details
Name: | bby_PriorPeriodForeignCurrencyExchangeRateUsedToAlignOperationsReported
Namespace Prefix: | bby_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration