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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2015
Feb. 28, 2014
Deferred tax assets:    
Employee benefit and incentive plans $ 60,082us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits $ 59,225us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Goodwill and other intangible assets 41,728us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 32,724us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Net operating loss carryforwards 24,227us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 24,067us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Reserves not currently deductible 19,382us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves 25,189us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
Inventory costing 9,531us-gaap_DeferredTaxAssetsInventory 7,243us-gaap_DeferredTaxAssetsInventory
Accrued expenses deductible as paid 9,187us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 5,882us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Deferred revenue 1,871us-gaap_DeferredTaxAssetsDeferredIncome 2,154us-gaap_DeferredTaxAssetsDeferredIncome
Deferred capital loss 1,407us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 2,985us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Foreign tax credit carryforwards 1,227us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 6,137us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Other (each less than 5 percent of total assets) 8,369us-gaap_DeferredTaxAssetsOther 10,859us-gaap_DeferredTaxAssetsOther
Deferred tax assets, Gross 201,330us-gaap_DeferredTaxAssetsGross 198,644us-gaap_DeferredTaxAssetsGross
Valuation allowance (23,482)us-gaap_DeferredTaxAssetsValuationAllowance (29,318)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 177,848us-gaap_DeferredTaxAssetsNet 169,326us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Property, plant and equipment 48,123us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 53,837us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other 3,169us-gaap_DeferredTaxLiabilitiesOther 2,235us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 51,292us-gaap_DeferredTaxLiabilities 56,072us-gaap_DeferredTaxLiabilities
Net deferred tax assets 126,556us-gaap_DeferredTaxAssetsLiabilitiesNet 113,254us-gaap_DeferredTaxAssetsLiabilitiesNet
Section 382 [Member]    
Deferred tax assets:    
Net operating loss carryforwards $ 24,319us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= am_SectionThreeEightTwoLimitationMember		 $ 22,179us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= am_SectionThreeEightTwoLimitationMember