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Rollforward of Restructuring Liabilities Recognized in Accrued Compensation and Payroll Taxes and Other Current Liabilities and Accrued Expenses in Consolidated Balance Sheets (Detail) $ in Thousands	9 Months Ended
	Oct. 31, 2020 USD ($)
Restructuring And Related Activities [Abstract]
Accrued liability as of February 1, 2020	$ 4,187
Add: Costs incurred, excluding non-cash charges	23,568
Less: Cash payments and adjustments	(23,771)
Accrued liability as of October 31, 2020	$ 3,984

X

- Definition

Payments for restructuring and restructuring reserve accrual adjustment.

+ References

No definition available.

+ Details

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Namespace Prefix:	aeo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount 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. It excludes non-cash charges.

+ References

No definition available.

+ Details

Name:	aeo_RestructuringChargeCashCharges
Namespace Prefix:	aeo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RestructuringAndRelatedActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant