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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, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected employer contributions to the defined benefit pension plans | $ 17,000 |  |
Discretionary contribution | 10,000 |  |
Expected future benefit payments [Abstract] |  |  |
2020 | 25,155 |  |
2021 | 24,351 |  |
2022 | 25,913 |  |
2023 | 26,692 |  |
2024 | 27,533 |  |
2025-2029 | 147,785 |  |
Total | 277,429 |  |
U.S. [Member] |  |  |
Expected future benefit payments [Abstract] |  |  |
2020 | 16,287 |  |
2021 | 14,741 |  |
2022 | 14,894 |  |
2023 | 15,259 |  |
2024 | 15,436 |  |
2025-2029 | 76,053 |  |
Total | 152,670 |  |
Other postretirement benefits [Abstract] |  |  |
Annual (credits) expenses for benefit plans | 113 | $ 647 | $ 9,655
Non-U.S. [Member] |  |  |
Expected future benefit payments [Abstract] |  |  |
2020 | 8,868 |  |
2021 | 9,610 |  |
2022 | 11,019 |  |
2023 | 11,433 |  |
2024 | 12,097 |  |
2025-2029 | 71,732 |  |
Total | 124,759 |  |
Other postretirement benefits [Abstract] |  |  |
Annual (credits) expenses for benefit plans | (7,893) | (7,641) | (3,150)
Non-U.S. [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected employer contributions to the defined benefit pension plans | 11,700 |  |
Postretirement Life Insurance and Health Care Benefits [Member] |  |  |
Other postretirement benefits [Abstract] |  |  |
Curtailment gain (loss) | 2,500 |  |
Accumulated post-retirement benefit obligation | 1,600 | 1,800 |
Annual (credits) expenses for benefit plans | (100) | (100) | (200)
Defined Contribution Savings Plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Expense recorded | $ 13,100 | $ 14,400 | $ 15,500

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