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Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017 | May 31, 2021
Stock Repurchase Programs [Line Items] |  |  |  |  |
Authorization of stock repurchase program |  |  | Jan. 08, 2008 |  |
Shares repurchased | 1,144,952 | 0 | 1,248,398 | 0 |
Shares repurchased, value | $ 74,998 |  | $ 81,992 |  |
Repurchase of common stock price per shares | $ 65.50 |  | $ 65.68 |  |
Scenario Forecast |  |  |  |  |
Stock Repurchase Programs [Line Items] |  |  |  |  |
Capital to be returned to stockholders through dividends and share repurchases |  |  |  |  | $ 1,500,000

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