Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	May. 31, 2015	May. 31, 2014
Numerator:
Net income for basic and diluted earnings per common share	$ 19,924	$ 14,925
Denominator:
Denominator for basic earnings per common share-weighted average shares (shares)	25,756	25,623
Effect of dilutive securities:
Employee and Director stock awards (shares)	106	116
Denominator for diluted earnings per common share (shares)	25,862	25,739
Earnings per share basic and diluted:
Basic earnings per Common share (usd per share)	$ 0.77	$ 0.58
Diluted earnings per common share (usd per share)	$ 0.77	$ 0.58