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Pension Plans - Additional Information (Detail) - Pension Benefits - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2020 | May 31, 2020 | May 31, 2019 | May 31, 2018
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 |  | $ 21,100,000 | $ 19,400,000 | $ 18,700,000
Estimated benefits payable in the first year |  | 71,000,000.0 |  |
Estimated benefits payable in the second year |  | 71,000,000.0 |  |
Estimated benefits payable in the third year |  | 70,600,000 |  |
Estimated benefits payable in the fourth year |  | 70,100,000 |  |
Estimated benefits payable in the fifth year |  | 67,300,000 |  |
Estimated benefits payable in the years thereafter |  | 339,200,000 |  |
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 |  | 8,000 |  |
Additional contribution to retirement plan in the current | $ 51,500,000 | 52,182,000 | 57,821,000 |
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 |  | 6,700,000 |  |
Additional contribution to retirement plan in the current |  | $ 6,331,000 | $ 6,770,000 |

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