Earnings Per Share (Narrative) (Details) - shares shares in Millions	9 Months Ended
Oct. 31, 2020	Nov. 02, 2019
Earnings Per Share [Abstract]
Contingently issuable shares excluded from diluted earnings per share	0.5	0.7

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