Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Aug. 31, 2019	Aug. 31, 2018	May 31, 2021
Stock Repurchase Programs [Line Items]
Authorization of stock repurchase program	Jan. 08, 2008
Shares repurchased	1,655,616	103,446
Shares repurchased, value	$ 100,000	$ 6,994
Repurchase of common stock price per shares	$ 60.40	$ 67.61
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

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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