Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Nov. 30, 2019	Aug. 31, 2019	Nov. 30, 2018	Aug. 31, 2018	Nov. 30, 2019	Nov. 30, 2018	May 31, 2021
Stock Repurchase Programs [Line Items]
Authorization of stock repurchase program					Jan. 08, 2008
Shares repurchased	0		1,144,952		1,655,616	1,248,398
Shares repurchased, value		$ 100,000	$ 74,998	$ 6,994	$ 100,000	$ 82,000
Repurchase of common stock price per shares			$ 65.50		$ 60.40	$ 65.68
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