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Pension Plans - Additional Information (Detail) - Pension Benefits - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2019 | May 31, 2019 | May 31, 2018 | May 31, 2017
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Average compensation with accrued benefits vesting period |  | 5 years |  |
Matching contribution charged to income |  | $ 19,400 | $ 18,700 | $ 17,400
Estimated benefits payable in the first year |  | 60,700 |  |
Estimated benefits payable in the second year |  | 57,300 |  |
Estimated benefits payable in the third year |  | 62,300 |  |
Estimated benefits payable in the fourth year |  | 62,800 |  |
Estimated benefits payable in the fifth year |  | 62,100 |  |
Estimated benefits payable in the years thereafter |  | 320,000 |  |
U.S. Plans |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Contribution to retirement plans in the next fiscal year |  | 900 |  |
Additional contribution to retirement plan in the current | $ 56,500 | 57,821 | 53,829 |
Non-U.S. Plans |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Contribution to retirement plans in the next fiscal year |  | 6,400 |  |
Additional contribution to retirement plan in the current |  | $ 6,770 | $ 7,460 |

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