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Basis of Presentation - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Nov. 29, 2013
Nov. 29, 2013
Nov. 28, 2014
Feb. 28, 2014
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Equity interest holdings in Schurman Fine Papers 15.00%us-gaap_VariableInterestEntityOwnershipPercentage      
Investment impairment charge $ 1,935,000us-gaap_ImpairmentOfInvestments $ 1,935,000us-gaap_ImpairmentOfInvestments    
Forfeiture of equity interest in cost method investment       15.00%am_ForfeitureOfEquityInterestInCostMethodInvestmentPercentage
Adjustments for Error Correction [Member]        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Increase in net income due to decrease in tax expense     4,100,000us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= am_AdjustmentsForErrorCorrectionMember
 
Schurman [Member]        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Investment impairment charge 1,900,000us-gaap_ImpairmentOfInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= am_SchurmanMember
     
Carrying amount of the investment 0us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssetsAndLiabilitiesNet
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= am_SchurmanMember
0us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssetsAndLiabilitiesNet
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= am_SchurmanMember
   
Schurman [Member] | Liquidity Guaranty [Member]        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Number of days after Schurman's lenders commence liquidation of collateral under Senior Credit Facility     91 days  
Expiration period of liquidity guaranty     2016-07  
Maximum exposure to loss, amount     10,000,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_GuaranteeOfIndebtednessOfOthersMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= am_SchurmanMember
 
Schurman [Member] | Business Trade and Other Receivables [Member]        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Maximum exposure to loss, amount     33,800,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_CollectibilityOfReceivablesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= am_SchurmanMember
 
Schurman [Member] | Operating Leases Subleased to Schurman [Member]        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Maximum exposure to loss, amount $ 8,500,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= am_OperatingLeaseSubleaseToSchurmanMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= am_SchurmanMember
$ 8,500,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= am_OperatingLeaseSubleaseToSchurmanMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= am_SchurmanMember
$ 5,100,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= am_OperatingLeaseSubleaseToSchurmanMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= am_SchurmanMember
7,100,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= am_OperatingLeaseSubleaseToSchurmanMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= am_SchurmanMember