Shareholders' Equity - Additional Information (Detail)		6 Months Ended	106 Months Ended
	Aug. 31, 2017 USD ($)	Aug. 31, 2017 USD ($) $ / shares shares	Aug. 31, 2017 USD ($) $ / shares shares
Statement Of Stockholders Equity [Abstract]
Repurchase of common stock through a stock repurchase program	$ 40,000,000	$ 40,000,000	$ 40,000,000
Repurchase of common stock | shares		191,033	1,442,236
Repurchase of common stock, average cost per share | $ / shares		$ 17.33	$ 14.99
Total amount available to repurchase of shares	$ 18,400,000