Shareholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	May 31, 2013	Feb. 28, 2012
Statement Of Stockholders Equity [Abstract]
Repurchase of common stock through a stock repurchase program	$ 5.0
Share purchased under the repurchase program	96,000
Average price from inception of program	$ 10.45
Additional Authorized amount available to repurchase shares		5.0
Total amount available to repurchase of shares		$ 9.0
Shares purchased unrelated to stock repurchase program	49