Share Based Payments Summary of Nonvested Options and Changes (Detail) - 3 months ended May. 31, 2015 - $ / shares	Total
Options
Nonvested, beginning of period	3,167,083
Granted	1,452,500
Vested	1,762,996
Forfeited	35,000
Nonvested, end of period	2,821,587
Weighted Average Grant Date Fair Value
Nonvested, beginning of period	$ 1.08
Granted	1.05
Vested	0.70
Forfeited	1.50
Nonvested, end of period	$ 1.30