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Contingencies and Commitments - Commitments (Details) $ in Millions | 12 Months Ended
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Jan. 28, 2017 USD ($)
Outstanding letters of credit and bankers' acceptances [Member] |
Commitments [Line Items] |
Unrecorded Unconditional Purchase Obligation, Purchases | $ 89

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- Definition Commitments [Line Items] + References No definition available. + Details
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Namespace Prefix: | bby_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount purchased during the period under an unrecorded unconditional purchase obligation (for example, under the take-or-pay or throughput contract). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73718637&loc=d3e25336-109308 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |