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Retirement Plans, Expected Employer Contributions and Benefit Payments and Other Retirement Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected employer contributions to the defined benefit pension plans | $ 16,900 |  |
Discretionary contribution | 10,000 |  |
Expected future benefit payments [Abstract] |  |  |
2021 | 26,314 |  |
2022 | 25,948 |  |
2023 | 26,598 |  |
2024 | 27,404 |  |
2025 | 28,802 |  |
2026-2030 | 148,862 |  |
Total | 283,928 |  |
Defined Contribution Savings Plans [Abstract] |  |  |
Expense recorded | 19,000 | $ 13,100 | $ 14,400
U.S. [Member] |  |  |
Expected future benefit payments [Abstract] |  |  |
2021 | 16,581 |  |
2022 | 15,205 |  |
2023 | 15,533 |  |
2024 | 15,713 |  |
2025 | 15,363 |  |
2026-2030 | 77,026 |  |
Total | 155,421 |  |
Other postretirement benefits [Abstract] |  |  |
Annual (credits) expenses for benefit plans | (542) | 113 | 647
Non-U.S. [Member] |  |  |
Expected future benefit payments [Abstract] |  |  |
2021 | 9,733 |  |
2022 | 10,743 |  |
2023 | 11,065 |  |
2024 | 11,691 |  |
2025 | 13,439 |  |
2026-2030 | 71,836 |  |
Total | 128,507 |  |
Other postretirement benefits [Abstract] |  |  |
Annual (credits) expenses for benefit plans | (7,256) | (7,893) | (7,641)
Non-U.S. [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected employer contributions to the defined benefit pension plans | 11,800 |  |
Postretirement Life Insurance and Health Care Benefits [Member] |  |  |
Other postretirement benefits [Abstract] |  |  |
Accumulated post-retirement benefit obligation | 1,400 | 1,600 |
Annual (credits) expenses for benefit plans | $ (100) | $ (100) | $ (100)

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