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Contingencies and Commitments - Commitments (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Accenture Service Contract [Member]  
Commitments [Line Items]  
Long-term Future Contractual Obligations, Low End of the Range $ 17bby_LongTermFutureContractualObligationsLowEndOfRange
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= bby_AccentureServiceContractMember
Long-term Future Contractual Obligations, High End of the Range 89bby_LongTermFutureContractualObligationsHighEndOfRange
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= bby_AccentureServiceContractMember
Outstanding letters of credit and bankers' acceptances [Member]  
Commitments [Line Items]  
Unrecorded Unconditional Purchase Obligation, Purchases $ 100us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= bby_OutstandingLettersOfCreditAndBankersAcceptancesMember