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Customer Allowances and Discounts - Additional Information (Detail) (Allowance for Rebates [Member], USD $)
In Millions, unless otherwise specified
Nov. 28, 2014
Feb. 28, 2014
Nov. 29, 2013
Allowance for Rebates [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Trade allowances and discounts settled in cash $ 16.1am_CustomerAllowancesAndDiscountsSettledInCash
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= am_AllowanceForRebatesMember		 $ 16.5am_CustomerAllowancesAndDiscountsSettledInCash
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= am_AllowanceForRebatesMember		 $ 15.4am_CustomerAllowancesAndDiscountsSettledInCash
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= am_AllowanceForRebatesMember