Earnings Per Share (Narrative) (Details) - shares shares in Millions	3 Months Ended
Apr. 29, 2017	Apr. 30, 2016
Earnings Per Share [Abstract]
Contingently issuable shares excluded from diluted earnings per share	0.4	0.3

Additional shares excluded from calculation of diluted eps as vesting conditions have not been satisfied.

No definition available.

Name:	fl_ContingentlyIssuableSharesExcludedFromDilutedEarningsPerShare
Namespace Prefix:	fl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration