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Earnings per Share - Additional Information (Detail)
In Millions, unless otherwise specified
12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Outstanding Stock Awards      
Earnings Per Share Disclosure [Line Items]      
Shares that were not included in the computation of weighted average diluted common share amounts as the effect of doing so would have been anti-dilutive 2.3us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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Restricted Stock Units (RSUs)      
Earnings Per Share Disclosure [Line Items]      
Shares of restricted stock units not included in the computation of weighted average diluted common share amounts because the number of shares ultimately issued is contingent on performance 1.9aeo_SecuritiesExcludedFromComputationOfEarningsPerShare
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