Share Based Payments Assumptions used to Calculate Fair Value of Options on Date of Grant (Detail)	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Dividend Yield:	0.00%	0.00%	0.00%
Expected Life (Years):	4 years 3 months 12 days	4 years 2 months 12 days	6 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-Free Interest Rate:	0.60%	0.50%	1.20%
Expected Volatility:	80.40%	128.90%	110.20%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-Free Interest Rate:	1.50%	0.70%	2.50%
Expected Volatility:	115.90%	131.40%	111.30%