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Goodwill and Intangible Assets, net - Summary of Goodwill and Definite-lived Intangible Assets, Net, (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Feb. 01, 2020 | Jan. 28, 2017
Intangible Assets, Net (Including Goodwill) [Abstract] |  |
Accumulated impairment | $ 1.7 | $ 2.5

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- Definition Accumulated impairment loss. + References No definition available. + Details
Name: | aeo_AccumulatedImpairmentLoss
Namespace Prefix: | aeo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IntangibleAssetsNetIncludingGoodwillAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration