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Debt - Summary of Debt Due Within One Year (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 28, 2014
Feb. 28, 2014
Nov. 29, 2013
Debt Disclosure [Line Items]      
Debt due within one year $ 23,800us-gaap_DebtCurrent $ 20,000us-gaap_DebtCurrent $ 20,000us-gaap_DebtCurrent
Term Loan [Member]      
Debt Disclosure [Line Items]      
Debt due within one year 20,000us-gaap_DebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= am_TermLoanMember		 20,000us-gaap_DebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= am_TermLoanMember		 20,000us-gaap_DebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= am_TermLoanMember
Accounts Receivable Facility [Member]      
Debt Disclosure [Line Items]      
Debt due within one year $ 3,800us-gaap_DebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= am_AccountsReceivableFacilityMember