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Financial Instruments Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Feb. 28, 2015
Rate
Feb. 28, 2014
Rate
Feb. 28, 2013
Rate
Unrecorded Unconditional Purchase Obligation $ 92,647us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount    
Entity-Wide Revenue, Major Customer, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1 10.00%us-gaap_ConcentrationRiskPercentage1 10.00%us-gaap_ConcentrationRiskPercentage1
Standby Letters of Credit [Member]      
Letters of Credit Outstanding, Amount 827us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember		   717us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember
Letter of Credit [Member]      
Letters of Credit Outstanding, Amount $ 0us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember		 0us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember		  
Accounts Receivable [Member]      
Entity-Wide Revenue, Major Customer, Percentage 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember		 18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember		  
Sales Revenue, Net [Member]      
Entity-Wide Revenue, Major Customer, Percentage 31.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember		 29.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember		 28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember