XML 59 R39.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Summary of Significant Accounting Policies - Fiscal Year (Details) | 12 Months Ended
--- | ---
Jan. 28, 2017
Fiscal Year [Abstract] |
Number of Weeks in Fiscal Period | 52

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

X
- 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