Shareholders' Equity - Additional Information (Detail)		9 Months Ended	109 Months Ended
	Nov. 30, 2017 USD ($)	Nov. 30, 2017 USD ($) $ / shares shares	Nov. 30, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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
Unrelated to Stock Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common stock | shares		145