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Business Segment Information - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Jul. 31, 2013
Nov. 28, 2014
Nov. 29, 2013
Nov. 28, 2014
Nov. 29, 2013
Aug. 29, 2014
Feb. 28, 2014
Segment Reporting Information [Line Items]              
Net gain on sale of the AGI In-Store business   $ (139,000)us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal   $ 38,663,000us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal      
Interest income   2,517,000us-gaap_InterestIncomeOther 29,000us-gaap_InterestIncomeOther 2,658,000us-gaap_InterestIncomeOther 222,000us-gaap_InterestIncomeOther    
Non-cash loss on disposal of fixed assets   90,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment 672,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment 15,823,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment 559,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment    
Gain related to Party City investment 3,300,000us-gaap_GainLossOnInvestments       3,262,000us-gaap_GainLossOnInvestments    
Compensation termination benefits description       Termination benefits are primarily considered part of an ongoing benefit arrangement, accounted for in accordance with ASC Topic 712, "Compensation - Nonretirement Postemployment Benefits," and are recorded when payment of the benefits is probable and can be reasonably estimated.      
Severance accrual   4,500,000am_SeveranceLiability 2,500,000am_SeveranceLiability 4,500,000am_SeveranceLiability 2,500,000am_SeveranceLiability   4,000,000am_SeveranceLiability
Clinton Cards [Member]              
Segment Reporting Information [Line Items]              
Interest income   2,500,000us-gaap_InterestIncomeOther
/ us-gaap_DebtInstrumentAxis
= am_ClintonCardsMember
         
WHQ Location [Member]              
Segment Reporting Information [Line Items]              
Non-cash loss on disposal of fixed assets       15,500,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment
/ us-gaap_MajorPropertyClassAxis
= am_WorldHeadQuartersLocationMember
  15,500,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment
/ us-gaap_MajorPropertyClassAxis
= am_WorldHeadQuartersLocationMember
 
Unallocated Segment [Member] | Clinton Cards [Member]              
Segment Reporting Information [Line Items]              
Interest income   2,500,000us-gaap_InterestIncomeOther
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_DebtInstrumentAxis
= am_ClintonCardsMember
  2,500,000us-gaap_InterestIncomeOther
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_DebtInstrumentAxis
= am_ClintonCardsMember
     
Unallocated Segment [Member] | AGI In-Store [Member]              
Segment Reporting Information [Line Items]              
Net gain on sale of the AGI In-Store business       38,700,000us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_RelatedPartyTransactionAxis
= am_AgIndustriesIncMember
     
Unallocated Segment [Member] | WHQ Location [Member]              
Segment Reporting Information [Line Items]              
Non-cash loss on disposal of fixed assets       2,200,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_MajorPropertyClassAxis
= am_WorldHeadQuartersLocationMember
     
Retail Operations [Member] | United Kingdom [Member]              
Segment Reporting Information [Line Items]              
Number of card and gift retail stores   415us-gaap_NumberOfStores
/ us-gaap_StatementBusinessSegmentsAxis
= am_InternationalRetailOperationsMember
/ us-gaap_StatementGeographicalAxis
= country_GB
  415us-gaap_NumberOfStores
/ us-gaap_StatementBusinessSegmentsAxis
= am_InternationalRetailOperationsMember
/ us-gaap_StatementGeographicalAxis
= country_GB
     
North American Social Expression Products [Member] | WHQ Location [Member]              
Segment Reporting Information [Line Items]              
Non-cash loss on disposal of fixed assets       13,300,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment
/ us-gaap_MajorPropertyClassAxis
= am_WorldHeadQuartersLocationMember
/ us-gaap_StatementBusinessSegmentsAxis
= am_NorthAmericanSocialExpressionProductsMember
     
Unallocated Segment [Member]              
Segment Reporting Information [Line Items]              
Non-recurring merger-related transaction costs         17,400,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementBusinessSegmentsAxis
= am_UnallocatedSegmentMember
   
Gain related to Party City investment         $ 3,300,000us-gaap_GainLossOnInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= am_UnallocatedSegmentMember