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Retirement Plans, Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
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 | $ 659,426 | $ 621,877 |
Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 5,565 | 2,251 |
Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | $ 439,915 | 405,998 |
Equity Securities [Member] |  |  |
Pension plan assets/investments [Abstract] |  |  |
Target allocation percentage | 45.00% |  |
Fixed Income Securities and Cash [Member] |  |  |
Pension plan assets/investments [Abstract] |  |  |
Target allocation percentage | 55.00% |  |
U.S. [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | $ 213,946 | 213,628 | $ 204,983
U.S. [Member] | Investments Measured at NAV [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 213,946 | 213,628 |
U.S. [Member] | Global Equity Securites: Limited Partnership [Member] | Investments Measured at NAV [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 110,965 | 109,490 |
U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Investments Measured at NAV [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 102,981 | 104,138 |
U.S. [Member] | Other: Real Estate Commingled Trust Fund [Member] | Investments Measured at NAV [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Non-U.S. [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 445,480 | 408,249 | $ 419,448
Non-U.S. [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 5,565 | 2,251 |
Non-U.S. [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 439,915 | 405,998 |
Non-U.S. [Member] | U.S. Equities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 36,842 | 39,652 |
Non-U.S. [Member] | U.S. Equities [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Non-U.S. [Member] | U.S. Equities [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 36,842 | 39,652 |
Non-U.S. [Member] | Non-U.S. Equities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 103,460 | 117,575 |
Non-U.S. [Member] | Non-U.S. Equities [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Non-U.S. [Member] | Non-U.S. Equities [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 103,460 | 117,575 |
Non-U.S. [Member] | Balanced Managed Funds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 44,989 | 48,550 |
Non-U.S. [Member] | Balanced Managed Funds [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Non-U.S. [Member] | Balanced Managed Funds [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 44,989 | 48,550 |
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 257,565 | 200,575 |
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 3,431 | 855 |
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 254,134 | 199,720 |
Non-U.S. [Member] | Real Estate/Other [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 490 | 501 |
Non-U.S. [Member] | Real Estate/Other [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Non-U.S. [Member] | Real Estate/Other [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 490 | 501 |
Non-U.S. [Member] | Cash and Cash Equivalents [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 2,134 | 1,396 |
Non-U.S. [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 2,134 | 1,396 |
Non-U.S. [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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