Summary of Significant Accounting Policies Calculation of Basic and Diluted Net Income Per Share from Continuing Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Basic net income per common share:
Net income available to common shareholders	$ 17,676	$ 5,548	$ 20,697	$ 11,467
Impact of conversion of preferred stock into common stock	$ 0		$ 0
Basic shares:
Basic weighted average common shares outstanding (in shares)	12,114	11,100	11,989	10,961
Impact of equity awards (in shares)	273	247	174	352
Impact of conversion of preferred stock into common stock (in shares)	0	529	0	550
Diluted shares:
Diluted weighted average common shares outstanding (in shares)	12,387	11,876	12,163	11,863
Basic net income per common share:
Net income available to common shareholders from continuing operations, per basic shares (in dollars per share)	$ 1.46	$ 0.50	$ 1.73	$ 1.05
Diluted net income per common share:
Net income available to common shareholders from continuing operations, per dilutive shares (in dollars per share)	$ 1.43	$ 0.47	$ 1.70	$ 0.97