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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Feb. 28, 2015
Mar. 30, 2014
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2013
Feb. 29, 2012
Income Taxes [Line Items]            
Surrendered certain of its corporate-owned life insurance policies, increase in tax expense     $ 28,279us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance      
Benefit of dual consolidated losses     (13,268)am_IncomeTaxReconciliationForeignNetOfTaxCreditsAndTheBenefitOfDualConsolidatedLossesOfForeignBranches      
Valuation allowance     (4,244)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 12,606us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 2,209us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Income taxes paid from continuing operation     59,758us-gaap_IncomeTaxesPaid 18,637us-gaap_IncomeTaxesPaid 25,925us-gaap_IncomeTaxesPaid  
Valuation allowance 23,482us-gaap_DeferredTaxAssetsValuationAllowance   23,482us-gaap_DeferredTaxAssetsValuationAllowance 29,318us-gaap_DeferredTaxAssetsValuationAllowance    
Deferred tax asset related to foreign tax credit carryforwards 1,227us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign   1,227us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 6,137us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign    
Undistributed earnings of international subsidiaries 23,607us-gaap_UndistributedEarningsOfForeignSubsidiaries   23,607us-gaap_UndistributedEarningsOfForeignSubsidiaries      
Unrecognized tax benefits 20,814us-gaap_UnrecognizedTaxBenefits   20,814us-gaap_UnrecognizedTaxBenefits 19,011us-gaap_UnrecognizedTaxBenefits 21,659us-gaap_UnrecognizedTaxBenefits 30,360us-gaap_UnrecognizedTaxBenefits
Income tax expenses affected by unrecognized tax benefits if recognized 18,597us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate   18,597us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 16,255us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Decrease in unrecognized tax benefits 1,772us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit   1,772us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit      
Unrecognized tax benefits income tax penalties and interest accrued description     The Corporation recognizes interest and penalties accrued on unrecognized tax benefits and income taxes as a component of income tax expense.      
Interest and penalties on unrecognized tax benefits and refundable income taxes     (1,281)am_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedPeriodIncreaseDecrease 41am_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedPeriodIncreaseDecrease    
Accrued Interest and penalties on unrecognized tax benefit 2,580us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued   2,580us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 3,861us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued    
Open tax years by major tax jurisdiction     The Corporation is subject to examination by the IRS for tax years 2010 to the present and various U.S. state and local jurisdictions for tax years 2001 to the present. The Corporation is also subject to tax examination in various international tax jurisdictions, including Canada, the United Kingdom, Australia, Italy, Mexico and New Zealand for tax years 2006 to the present.      
Corrected errors in the accounting for income taxes 1,761us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions (4,144)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions (2,383)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions      
International [Member]            
Income Taxes [Line Items]            
Deferred tax asset relating to operating loss carryforward 6,226us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= am_InternationalMember
  6,226us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= am_InternationalMember
     
Deferred tax asset relating to operating loss carryforward, subject to expiration date 120us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= am_InternationalMember
  120us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= am_InternationalMember
     
Deferred tax asset relating to operating loss carryforward, no expiration date 6,106us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= am_InternationalMember
  6,106us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= am_InternationalMember
     
Subject to expiration date range 2020 through 2028 [Member]            
Income Taxes [Line Items]            
Deferred tax asset related to domestic net operating loss 12,923us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= am_DeferredTaxAssetsSubjectToExpirationDateRangeTwoThousandTwentyThroughTwoThousandTwentyEightMember
  12,923us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= am_DeferredTaxAssetsSubjectToExpirationDateRangeTwoThousandTwentyThroughTwoThousandTwentyEightMember
     
Subject to expiration date range 2016 to 2036 [Member]            
Income Taxes [Line Items]            
Deferred tax asset related to state net operating loss 5,078us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= am_DeferredTaxAssetsSubjectToExpirationDateRangeTwoThousandSixteenToTwoThousandThirtySixMember
  5,078us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= am_DeferredTaxAssetsSubjectToExpirationDateRangeTwoThousandSixteenToTwoThousandThirtySixMember
     
Subject to expiration date range 2019 through 2022 [Member]            
Income Taxes [Line Items]            
Deferred tax asset related to foreign tax credit carryforwards $ 8,673us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= am_DeferredTaxAssetsSubjectToExpirationDateRangeTwoThousandNineteenThroughTwoThousandTwentyTwoMember
  $ 8,673us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= am_DeferredTaxAssetsSubjectToExpirationDateRangeTwoThousandNineteenThroughTwoThousandTwentyTwoMember