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Stock-Based Compensation (Details 1) (USD $)
12 Months Ended
Feb. 28, 2015
Nonvested share award transactions  
Nonvested Number, Beginning 575,064us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Number of shares, Granted 186,468us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod [1]
Number of shares, Vested (358,651)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Number of shares, Canceled (2,173)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Nonvested Number, Ending 400,708us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Nonvested share award transactions, Wieghted Average Grant Date Fair Value  
Weighted average grant date fair value, Beginning $ 16.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Weighted average grant date fair value, Granted $ 28.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Weighted average grant date fair value, Vested $ 15.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Weighted average grant date fair value, Canceled $ 32.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Weighted average grant date fair value, Ending $ 23.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
[1] Includes 40,735 of shares granted and immediately vested for achievement above target for the fiscal 2012-2014 performance period. Nonvested share units of 117,765 (at target) were previously granted in fiscal 2012 for this performance period.