Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Jan. 31, 2021	Feb. 28, 2021	Feb. 29, 2020	Aug. 31, 2019	Feb. 28, 2021	Feb. 29, 2020	May 31, 2021
Stock Repurchase Programs [Line Items]
Authorization of stock repurchase program					Jan. 08, 2008
Stock repurchase program, remaining authorized repurchase, value	$ 469,700
Stock repurchase program expiration date	May 31, 2021
Shares repurchased		290,174	0		290,174	1,655,616
Shares repurchased, value		$ 24,628		$ 100,000	$ 24,600	$ 100,000
Repurchase of common stock price per shares		$ 84.87			$ 84.87	$ 60.40
Scenario Forecast
Stock Repurchase Programs [Line Items]
Capital to be returned to stockholders through share repurchases							$ 1,000,000
Stock repurchase program, remaining authorized repurchase, value							$ 600,000