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, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Basic net income (loss) per common share:
Net income (loss) available to common shareholders	$ (279)	$ 17,676	$ 69,411	$ 20,697
Basic shares:
Basic weighted average common shares outstanding (in shares)	12,347	12,114	12,321	11,989
Impact of equity awards (in shares)	0	273	233	174
Diluted shares:
Diluted weighted average common shares outstanding (in shares)	12,347	12,387	12,554	12,163
Basic net income (loss) per common share:
Net income available to common shareholders from continuing operations, per basic shares (in dollars per share)	$ (0.02)	$ 1.46	$ 5.63	$ 1.73
Diluted net income (loss) per common share:
Net income available to common shareholders from continuing operations, per dilutive shares (in dollars per share)	$ (0.02)	$ 1.43	$ 5.53	$ 1.70