Share Based Payments Summary of Nonvested Options and Changes (Detail) (USD $)	12 Months Ended
	Feb. 28, 2014
Options
Nonvested, beginning of period (in shares)	3,188,104
Granted (in shares)	886,219
Vested (in shares)	716,342
Forfeited (in shares)	32,500
Nonvested, end of period (in shares)	3,325,481
Weighted Average Grant Date Fair Value
Nonvested, beginning of period (in dollars per share)	$ 0.76
Granted (in dollars per share)	$ 1.67
Vested (in dollars per share)	$ 0.85
Forfeited (in dollars per share)	$ 0.57
Nonvested, end of period (in dollars per share)	$ 0.98