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Retirement Plans, Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
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 | $ 624,431 | $ 590,134 |
Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 1,762 | 17,835 |
Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | $ 417,686 | 372,298 |
Equity Securities [Member] |  |  |
Pension plan assets/investments [Abstract] |  |  |
Target allocation percentage | 49.00% |  |
Fixed Income Securities and Cash [Member] |  |  |
Pension plan assets/investments [Abstract] |  |  |
Target allocation percentage | 50.00% |  |
Real Estate [Member] |  |  |
Pension plan assets/investments [Abstract] |  |  |
Target allocation percentage | 1.00% |  |
U.S. [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | $ 204,983 | 200,001 | $ 215,923
U.S. [Member] | Investments Measured at NAV [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 204,983 | 200,001 |
U.S. [Member] | Global Equity Securites: Limited Partnership [Member] | Investments Measured at NAV [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 95,933 | 91,397 |
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 | 100,295 | 95,922 |
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 | 8,755 | 12,682 |
Non-U.S. [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 419,448 | 390,133 | $ 352,484
Non-U.S. [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 1,762 | 17,835 |
Non-U.S. [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 417,686 | 372,298 |
Non-U.S. [Member] | U.S. Equities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 31,203 | 28,598 |
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 | 31,203 | 28,598 |
Non-U.S. [Member] | Non-U.S. Equities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 96,387 | 85,961 |
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 | 96,387 | 85,961 |
Non-U.S. [Member] | Balanced Managed Funds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 91,743 | 79,649 |
Non-U.S. [Member] | Balanced Managed Funds [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 10,196 |
Non-U.S. [Member] | Balanced Managed Funds [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 91,743 | 69,453 |
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 197,804 | 187,797 |
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 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 | 197,804 | 187,797 |
Non-U.S. [Member] | Real Estate/Other [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 549 | 489 |
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 | 549 | 489 |
Non-U.S. [Member] | Cash and Cash Equivalents [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 1,762 | 7,639 |
Non-U.S. [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 1,762 | 7,639 |
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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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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