Stock Repurchase Program - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2021	May 31, 2021	May 31, 2020	May 31, 2019
Stock Repurchase Programs [Line Items]
Authorization of stock repurchase program		Jan. 08, 2008
Capital to be returned to stockholders through share repurchases		$ 1,000,000,000.0
Stock repurchase program, remaining authorized repurchase, value	$ 469,700,000	$ 600,000,000.0
Stock repurchase program expiration date	May 31, 2021
Shares repurchased		594,061	2,041,847	3,286,907
Shares repurchased, value		$ 49,956,000	$ 125,000,000	$ 200,222,000
Repurchase of common stock price per shares		$ 84.09	$ 61.22	$ 60.92
Maximum
Stock Repurchase Programs [Line Items]
Stock repurchase program, remaining authorized repurchase, value		$ 419,800,000