Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Aug. 31, 2019	Nov. 30, 2020	Nov. 30, 2019	May 31, 2021
Stock Repurchase Programs [Line Items]
Authorization of stock repurchase program				Jan. 08, 2008
Shares repurchased	0	0		0	1,655,616
Shares repurchased, value			$ 100,000		$ 100,000
Repurchase of common stock price per shares					$ 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