XML 71 R51.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Summary of Significant Accounting Policies - Customer Loyalty Programs (Details) | 12 Months Ended
--- | ---
Jan. 28, 2017
Accounting Policies [Abstract] |
Period of Expiration for Customer Loyalty Certificates, Low End of Range | 2 months
Period of Expiration for Customer Loyalty Certificates, High End of Range | 12 months

X
- Definition Period of Expiration for Customer Loyalty Certificates, High End of Range + References No definition available. + Details
Name: | bby_PeriodOfExpirationForCustomerLoyaltyCertificatesHighEndOfRange
Namespace Prefix: | bby_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of Expiration for Customer Loyalty Certificates, Low End of Range + References No definition available. + Details
Name: | bby_PeriodOfExpirationForCustomerLoyaltyCertificatesLowEndOfRange
Namespace Prefix: | bby_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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