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Goodwill and Other Intangible Assets - Additional Information (Detail)
In Thousands, unless otherwise specified
12 Months Ended
Feb. 28, 2015
USD ($)
Feb. 28, 2014
USD ($)
Feb. 28, 2013
USD ($)
Feb. 28, 2015
Character property rights [Member]
USD ($)
Feb. 28, 2015
Clinton Cards [Member]
USD ($)
Feb. 28, 2015
Clinton Cards [Member]
GBP (£)
Feb. 28, 2014
Clinton Cards [Member]
USD ($)
Feb. 28, 2014
Clinton Cards [Member]
GBP (£)
Goodwill And Other Intangible Assets [Line Items]                
Intangible assets, net of accumulated amortization $ 30,048us-gaap_IntangibleAssetsNetExcludingGoodwill $ 49,138us-gaap_IntangibleAssetsNetExcludingGoodwill            
Property and exploration rights 37,700us-gaap_PaymentsToAcquireIntangibleAssets     37,700us-gaap_PaymentsToAcquireIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= am_CharacterPropertyRightsMember
       
Property rights with an indefinite useful life       11,310us-gaap_IndefiniteLivedContractualRights
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= am_CharacterPropertyRightsMember
       
Impairment of intangible assets         21,924us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= am_ClintonCardsMember
13,500us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= am_ClintonCardsMember
   
Impaired trade names         0us-gaap_IndefiniteLivedTradeNames
/ us-gaap_BusinessAcquisitionAxis
= am_ClintonCardsMember
     
Goodwill impairment charges             733us-gaap_GoodwillImpairmentLoss
/ us-gaap_BusinessAcquisitionAxis
= am_ClintonCardsMember
465us-gaap_GoodwillImpairmentLoss
/ us-gaap_BusinessAcquisitionAxis
= am_ClintonCardsMember
Impaired goodwill             0us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= am_ClintonCardsMember
 
Adjustment related to income taxes 4,346am_IntangibleAssetSubsequentRecognitionOfDeferredTaxAsset 2,749am_IntangibleAssetSubsequentRecognitionOfDeferredTaxAsset            
Amortization expense for intangible assets 3,797us-gaap_AmortizationOfIntangibleAssets 4,532us-gaap_AmortizationOfIntangibleAssets 5,079us-gaap_AmortizationOfIntangibleAssets          
Estimated annual amortization expense for 2016 3,291us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths              
Estimated annual amortization expense for 2017 2,920us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo              
Estimated annual amortization expense for 2018 2,845us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree              
Estimated annual amortization expense for 2019 2,736us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour              
Estimated annual amortization expense for 2020 $ 2,588us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive