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Black-Scholes Option Valuation Assumptions (Detail)
 3 Months Ended
May 03, 2014
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]  
Risk-free interest rate 1.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate [1]
Dividend yield 3.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Volatility factor 41.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate [2]
Weighted-average expected term 4 years 6 months [3]
Expected forfeiture rate 8.00%aeo_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitures [4]
[1] Based on the U.S. Treasury yield curve in effect at the time of grant with a term consistent with the expected life of our stock options.
[2] Based on a combination of historical volatility of the Company's common stock and implied volatility.
[3] Represents the period of time options are expected to be outstanding, based on historical experience.
[4] Based upon historical experience.