Calculation of Basic and Diluted Net Income Per Share from Continuing Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014
Amounts attributable to common shareholders for basic earnings per share:
Net income (loss) available to common shareholders from continuing operations	$ 1,952	$ (99,259)	$ 43,806
Impact of conversion of preferred stock into common stock	0	0	(325)
Diluted net income (loss):
Net income (loss) available to common shareholders from continuing operations	$ 1,952	$ (99,259)	$ 43,481
Basic shares:
Basic weighted average common shares outstanding (in shares)	44,136	42,537	40,506
Impact of equity awards (in shares)	1,128	0	3,264
Impact of conversion of preferred stock into common stock (in shares)	0	0	2,272
Diluted shares:
Diluted weighted average common shares outstanding (in shares)	45,264	42,537	46,042
Basic net income (loss) per common share:
Basic net income (loss) per common share (in dollars per share)	$ 0.04	$ (2.33)	$ 1.08
Diluted net income (loss) per common share:
Diluted net income (loss) per common share (in dollars per share)	$ 0.04	$ (2.33)	$ 0.94