Calculation of Basic and Diluted Net Income Per Share from Continuing Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013
Basic net income (loss):
Net income (loss) available to common shareholders from continuing operations	$ (99,259)	$ 43,806	$ (8,114)
Impact of conversion of preferred stock into common stock	0	(325)	0
Diluted net income (loss):
Net income (loss) available to common shareholders from continuing operations	$ (99,259)	$ 43,481	$ (8,114)
Basic shares:
Basic weighted average common shares outstanding (in shares)	42,537	40,506	39,034
Impact of equity awards (in shares)	0	3,264	0
Impact of conversion of preferred stock into common stock (in shares)	0	2,272	0
Diluted shares:
Diluted weighted average common shares outstanding (in shares)	42,537	46,042	39,034
Basic net income (loss) per common share:
Basic net income (loss) per common share (in dollars per share)	$ (2.33)	$ 1.08	$ (0.21)
Diluted net income (loss) per common share:
Diluted net income (loss) per common share (in dollars per share)	$ (2.33)	$ 0.94	$ (0.21)