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, 2022	Aug. 31, 2021	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021	May 31, 2021
Stock Repurchase Programs [Line Items]
Authorization of stock repurchase program			Jan. 08, 2008
Capital to be returned to stockholders through share repurchases							$ 1,000,000
Stock repurchase program, remaining authorized repurchase, value	$ 469,700	$ 392,300			$ 392,300		$ 600,000
Stock repurchase program expiration date	May 31, 2021
Shares repurchased		171,933		290,174	305,321	290,174
Shares repurchased, value		$ 15,000	$ 12,500	$ 24,628	$ 27,500	$ 24,600
Repurchase of common stock price per shares		$ 87.24		$ 84.87	$ 90.07	$ 84.87