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Acquisitions And Dispositions (Sale of AGI In-Store) - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended 1 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2013
Aug. 29, 2014
Mar. 31, 2015
Significant Acquisitions and Disposals [Line Items]          
Proceeds from sale of AGI In-Store $ 73,659us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets        
Net gain on sale of AGI In-Store 35,004us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal        
Operating income 144,406us-gaap_OperatingIncomeLoss 136,893us-gaap_OperatingIncomeLoss 94,165us-gaap_OperatingIncomeLoss    
Agi In Store [Member]          
Significant Acquisitions and Disposals [Line Items]          
Proceeds from sale of AGI In-Store       73,659us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= am_AgiInStoreMember
 
Operating income 53us-gaap_OperatingIncomeLoss
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= am_AgiInStoreMember
18,707us-gaap_OperatingIncomeLoss
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= am_AgiInStoreMember
     
supply agreement has an initial term 5 years        
committed to purchase a significant portion of our North American display fixtures requirements 180,000us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= am_AgiInStoreMember
       
Subsequent Event [Member] | Agi In Store [Member]          
Significant Acquisitions and Disposals [Line Items]          
Working capital adjustments made         3,200am_BusinessAcquisitionWorkingCapitalAdjustmentPaid
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= am_AgiInStoreMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Net gain on sale of AGI In-Store         $ 35,004us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= am_AgiInStoreMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember