Share Based Payments Assumptions used to Calculate Fair Value of Options on Date of Grant (Detail)	6 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-Free Interest Rate:		0.70%
Expected Dividend Yield:	0.00%	0.00%
Expected Life (Years):	4 years 3 months 18 days	4 years 2 months 12 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-Free Interest Rate:	0.60%
Expected Volatility:	108.90%	129.50%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-Free Interest Rate:	1.30%
Expected Volatility:	115.90%	131.40%