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Retirement Plans, Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
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 | $ 621,877 | $ 624,431 |
Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 2,251 | 1,762 |
Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | $ 405,998 | 417,686 |
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% |  |
U.S. [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | $ 213,628 | 204,983 | $ 200,001
U.S. [Member] | Investments Measured at NAV [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 213,628 | 204,983 |
U.S. [Member] | Global Equity Securites: Limited Partnership [Member] | Investments Measured at NAV [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 109,490 | 95,933 |
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 | 104,138 | 100,295 |
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 | 8,755 |
Non-U.S. [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 408,249 | 419,448 | $ 390,133
Non-U.S. [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 2,251 | 1,762 |
Non-U.S. [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 405,998 | 417,686 |
Non-U.S. [Member] | U.S. Equities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 39,652 | 31,203 |
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 | 39,652 | 31,203 |
Non-U.S. [Member] | Non-U.S. Equities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 117,575 | 96,387 |
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 | 117,575 | 96,387 |
Non-U.S. [Member] | Balanced Managed Funds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 48,550 | 91,743 |
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 | 48,550 | 91,743 |
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 200,575 | 197,804 |
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 855 | 0 |
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 199,720 | 197,804 |
Non-U.S. [Member] | Real Estate/Other [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 501 | 549 |
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 | 501 | 549 |
Non-U.S. [Member] | Cash and Cash Equivalents [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 1,396 | 1,762 |
Non-U.S. [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 1,396 | 1,762 |
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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