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, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Basic net income (loss) per common share:
Net income (loss) available to common shareholders, basic	$ 712	$ (279)	$ 23,824	$ 69,411
Basic shares:
Basic weighted average common shares outstanding (in shares)	12,609	12,347	12,565	12,321
Impact of equity awards (in shares)	816		921	233
Diluted shares:
Diluted weighted average common shares outstanding (in shares)	13,425	12,347	13,486	12,554
Net income (loss) available to common shareholders, diluted	$ 712	$ (279)	$ 23,824	$ 69,411
Basic net income (loss) per common share:
Net income available to common shareholders from continuing operations, per basic shares (in dollars per share)	$ 0.06	$ (0.02)	$ 1.90	$ 5.63
Diluted net income (loss) per common share:
Net income available to common shareholders from continuing operations, per dilutive shares (in dollars per share)	$ 0.05	$ (0.02)	$ 1.77	$ 5.53