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Net Earnings Per Share (Narrative) (Details)
3 Months Ended 9 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2014
Nov. 30, 2013
Net Earnings Per Share [Abstract]        
Anti-dilutive securities not included in calculation of diluted net earnings per share 1,707,581us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,309,282us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 2,617,453us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,175,274us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount