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Retirement Plans, Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Pension plan assets/investments [Abstract] |  |  |
Acceptable ranges within which asset allocations will fluctuate | 5.00% |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | $ 761,015 | $ 659,426 |
Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 6,665 | 5,565 |
Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | $ 517,221 | 439,915 |
Equity Securities [Member] |  |  |
Pension plan assets/investments [Abstract] |  |  |
Target allocation percentage | 50.00% |  |
Fixed Income Securities and Cash [Member] |  |  |
Pension plan assets/investments [Abstract] |  |  |
Target allocation percentage | 50.00% |  |
US [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | $ 237,129 | 213,946 | $ 213,628
US [Member] | Investments Measured at NAV [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 237,129 | 213,946 |
US [Member] | Global Equity Securities: Limited Partnership [Member] | Investments Measured at NAV [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 121,569 | 110,965 |
US [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Investments Measured at NAV [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 115,560 | 102,981 |
Non-US [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 523,886 | 445,480 | $ 408,249
Non-US [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 6,665 | 5,565 |
Non-US [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 517,221 | 439,915 |
Non-US [Member] | U.S. Equities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 51,882 | 36,842 |
Non-US [Member] | U.S. Equities [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | U.S. Equities [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 51,882 | 36,842 |
Non-US [Member] | Non-U.S. Equities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 124,496 | 103,460 |
Non-US [Member] | Non-U.S. Equities [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Non-U.S. Equities [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 124,496 | 103,460 |
Non-US [Member] | Balanced Managed Funds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 103,717 | 44,989 |
Non-US [Member] | Balanced Managed Funds [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Balanced Managed Funds [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 103,717 | 44,989 |
Non-US [Member] | Fixed Income Securities: Commingled Trust Funds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 238,027 | 257,565 |
Non-US [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 1,444 | 3,431 |
Non-US [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 236,583 | 254,134 |
Non-US [Member] | Real Estate/Other [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 543 | 490 |
Non-US [Member] | Real Estate/Other [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 0 | 0 |
Non-US [Member] | Real Estate/Other [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 543 | 490 |
Non-US [Member] | Cash and Cash Equivalents [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 5,221 | 2,134 |
Non-US [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | 5,221 | 2,134 |
Non-US [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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