Shareholders' Equity - Additional Information (Detail)		3 Months Ended	115 Months Ended
	May 31, 2018 USD ($)	May 31, 2018 USD ($) $ / shares shares	May 31, 2018 USD ($) $ / shares shares
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		37,943	1,480,179
Repurchase of common stock, average cost per share | $ / shares		$ 17.92	$ 15.07
Total amount available to repurchase of shares	$ 17,700,000