Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					9 Months Ended
	Feb. 29, 2020	Aug. 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	Feb. 29, 2020	Feb. 28, 2019	May 31, 2021
Stock Repurchase Programs [Line Items]
Authorization of stock repurchase program						Jan. 08, 2008
Shares repurchased	0		1,570,647			1,655,616	2,819,045
Shares repurchased, value		$ 100,000	$ 91,230	$ 74,998	$ 6,994	$ 100,000	$ 173,200
Repurchase of common stock price per shares			$ 58.08			$ 60.40	$ 61.45
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