Common Stock - Additional Information (Detail) (USD $)	Aug. 31, 2013	Feb. 28, 2013
Common Shares [Line Items]
Common stock, par value	$ 0.02	$ 0.02
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	19,140,186	19,058,923
Common stock, shares outstanding	10,316,014	10,198,121