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Summary of Significant Accounting Policies - Fiscal Year (Details) | 12 Months Ended
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Feb. 03, 2018 | Jan. 30, 2016
Fiscal Year [Abstract] |  |
Number of Weeks in Fiscal Period | 53 | 52

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

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- 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