Shareholders' Equity - Additional Information (Detail)	12 Months Ended	124 Months Ended
	Feb. 28, 2019 USD ($) $ / shares shares	Feb. 28, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common stock | shares	247,788	1,690,024
Repurchase of common stock, average cost per share | $ / shares	$ 19.42	$ 15.64
Total amount available to repurchase of shares | $	$ 13,600,000
Unrelated to Stock Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common stock | shares	15
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount | $	$ 40,000,000	$ 40,000,000