Impairment and Other Charges [Line Items]

No definition available.

Name:	fl_ImpairmentAndOtherChargesLineItems
Namespace Prefix:	fl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of stores closing prior to their natural lease expiration

+ References

No definition available.

+ Details

Name:	fl_NumberOfStoresClosingPriorToTheirNaturalLeaseExpiration
Namespace Prefix:	fl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Stores Damaged Related to Social Unrest

+ References

No definition available.

+ Details

Name:	fl_NumberOfStoresDamagedRelatedToSocialUnrest
Namespace Prefix:	fl_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of stores with non-cash impairment charge

+ References

No definition available.

+ Details

Name:	fl_NumberOfStoresWithNoncashImpairmentCharge
Namespace Prefix:	fl_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349

+ Details

Name:	us-gaap_GainLossRelatedToLitigationSettlement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 958
-SubTopic 220
-Section 45
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=114873921&loc=SL114875236-224282

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

+ Details

Name:	us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 25
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77888369&loc=SL77918431-209957

+ Details

Name:	us-gaap_OperatingLeaseImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

+ Details

Name:	us-gaap_RestructuringCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, before deduction of insurance proceeds, of loss recognized in the income statement for an event or transaction that is unusual in nature or infrequent in occurrence, or both.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=114868883&loc=SL114871943-224233

+ Details

Name:	us-gaap_UnusualOrInfrequentItemLossGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=fl_InventoryLossesRelatedToSocialUnrestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=fl_DamagesToStorePropertyRelatedToSocialUnrestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=fl_RepairsAndOtherCostsRelatedToSocialUnrestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=fl_RunnersPointAndSidestepMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=fl_RunnersPointGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=fl_EastbayMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Impairment and Other Charges (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2020 USD ($)	Nov. 02, 2019 USD ($)	Oct. 31, 2020 USD ($) store	Nov. 02, 2019 USD ($)
Impairment and Other Charges [Line Items]
Pension litigation charge		$ (1)	$ (2)	$ (3)
Impairment of assets			$ 15
Lease termination costs				$ 13
Number of stores with non-cash impairment charge \| store			70
Reorganization costs			$ 22
Losses related to social unrest	$ 1		$ 19
Number of stores damaged related to social unrest \| store			140
Inventory Losses Related to Social Unrest [Member]
Impairment and Other Charges [Line Items]
Losses related to social unrest			$ 15
Damages to Store Property Related to Social Unrest [Member]
Impairment and Other Charges [Line Items]
Losses related to social unrest			2
Repairs and Other Costs Related to Social Unrest [Member]
Impairment and Other Charges [Line Items]
Losses related to social unrest			$ 2
Runners Point and Sidestep [Member]
Impairment and Other Charges [Line Items]
Number of stores closing prior to their natural lease expiration \| store			40
Runners Point Group [Member]
Impairment and Other Charges [Line Items]
Reorganization costs	$ 3		$ 19
Eastbay [Member]
Impairment and Other Charges [Line Items]
Reorganization costs			$ 3