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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, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected employer contributions to the defined benefit pension plans | $ 15,600 |  |
Expected future benefit payments [Abstract] |  |  |
2019 | 23,924 |  |
2020 | 25,246 |  |
2021 | 24,857 |  |
2022 | 26,659 |  |
2023 | 27,566 |  |
2024-2028 | 150,760 |  |
Total | 279,012 |  |
U.S. [Member] |  |  |
Expected future benefit payments [Abstract] |  |  |
2019 | 15,435 |  |
2020 | 15,589 |  |
2021 | 14,322 |  |
2022 | 14,550 |  |
2023 | 14,947 |  |
2024-2028 | 75,428 |  |
Total | 150,271 |  |
Other postretirement benefits [Abstract] |  |  |
Curtailment gain (loss) | 0 | $ (8,842) | $ (1,857)
Annual (credits) expenses for benefit plans | 647 | 9,655 | 2,799
Non-U.S. [Member] |  |  |
Expected future benefit payments [Abstract] |  |  |
2019 | 8,489 |  |
2020 | 9,657 |  |
2021 | 10,535 |  |
2022 | 12,109 |  |
2023 | 12,619 |  |
2024-2028 | 75,332 |  |
Total | 128,741 |  |
Other postretirement benefits [Abstract] |  |  |
Curtailment gain (loss) | (19) | 0 | 0
Annual (credits) expenses for benefit plans | (7,641) | (3,150) | (4,657)
Non-U.S. [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected employer contributions to the defined benefit pension plans | 10,700 |  |
Postretirement Life Insurance and Health Care Benefits [Member] |  |  |
Other postretirement benefits [Abstract] |  |  |
Curtailment gain (loss) | 2,500 |  |
Accumulated post-retirement benefit obligation | 1,800 | 1,700 |
Annual (credits) expenses for benefit plans | (100) | (200) | 200
Defined Contribution Savings Plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Expense recorded | $ 14,400 | $ 15,500 | $ 16,200

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