Share Based Payments Summary of Stock Options Outstanding and Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Feb. 28, 2014
Options
Outstanding, beginning of period (in shares)	7,132,459
Granted (in shares)	886,219
Exercised (in shares)	434,500	[1]
Forfeited (in shares)	32,500
Expired (in shares)	567,073
Outstanding, end of period (in shares)	6,984,605
Exercisable, end of period (in shares)	3,659,124
Price
Outstanding, beginning of period (in dollars per share)	$ 4.31
Granted (in dollars per share)	$ 2.44
Exercised (in dollars per share)	$ 0.77	[1]
Forfeited (in dollars per share)	$ 0.70
Expired or exchanged (in dollars per share)	$ 11.09
Outstanding, end of period (in dollars per share)	$ 3.74
Exercisable, end of period (in dollars per share)	$ 5.96
Weighted Average Remaining Contractual Term, Outstanding	6 years 2 months 26 days
Weighted Average Remaining Contractual Term, Exercisable, end of period	4 years 2 months 26 days
Aggregate Intrinsic Value, Outstanding, end of period	$ 11,610
Aggregate Intrinsic Value, Exercisable, end of period	$ 5,481

[1] The Company did not record an income tax benefit related to option exercises in the year ended February 28 (29), 2012, 2013 and 2014. Cash received from option exercises during the years ended February 2012, 2013 and 2014 was less than $0.1 million, $0.3 million and $0.3 million, respectively.