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Net Earnings Per Share (Narrative) (Details)
3 Months Ended 6 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2014
Aug. 31, 2013
Net Earnings Per Share [Abstract]        
Anti-dilutive securities not included in calculation of diluted net earnings per share 2,885,903 1,426,163 2,586,357 1,073,635