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Retirement Plans, Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
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 | $ 590,134 | $ 568,407 |
Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 17,835 | 10,632 |
Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | $ 572,299 | 557,775 |
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. Plans [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | $ 200,001 | 215,923 | $ 222,966
U.S. Plans [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Plans [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 200,001 | 215,923 |
U.S. Plans [Member] | U.S. Commingled Funds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 64,125 | 69,550 |
U.S. Plans [Member] | U.S. Commingled Funds [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Plans [Member] | U.S. Commingled Funds [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 64,125 | 69,550 |
U.S. Plans [Member] | Non-U.S. Commingled Funds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 27,272 | 28,741 |
U.S. Plans [Member] | Non-U.S. Commingled Funds [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Plans [Member] | Non-U.S. Commingled Funds [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 27,272 | 28,741 |
U.S. Plans [Member] | Fixed Income Commingled Funds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 95,922 | 105,841 |
U.S. Plans [Member] | Fixed Income Commingled Funds [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Plans [Member] | Fixed Income Commingled Funds [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 95,922 | 105,841 |
U.S. Plans [Member] | Real Estate [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 12,682 | 11,791 |
U.S. Plans [Member] | Real Estate [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
U.S. Plans [Member] | Real Estate [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 12,682 | 11,791 |
Non-U.S. Plans [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 390,133 | 352,484 | $ 376,576
Non-U.S. Plans [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 17,835 | 10,632 |
Non-U.S. Plans [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 372,298 | 341,852 |
Non-U.S. Plans [Member] | U.S. Equities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 24,688 |
Non-U.S. Plans [Member] | U.S. Equities [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Non-U.S. Plans [Member] | U.S. Equities [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 24,688 |
Non-U.S. Plans [Member] | Non-U.S. Equities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 85,961 | 72,892 |
Non-U.S. Plans [Member] | Non-U.S. Equities [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Non-U.S. Plans [Member] | Non-U.S. Equities [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 85,961 | 72,892 |
Non-U.S. Plans [Member] | Balanced Managed Funds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 79,649 | 42,273 |
Non-U.S. Plans [Member] | Balanced Managed Funds [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 10,196 | 10,070 |
Non-U.S. Plans [Member] | Balanced Managed Funds [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 69,453 | 32,203 |
Non-U.S. Plans [Member] | Fixed Income Funds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 187,797 | 211,561 |
Non-U.S. Plans [Member] | Fixed Income Funds [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Non-U.S. Plans [Member] | Fixed Income Funds [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 187,797 | 211,561 |
Non-U.S. Plans [Member] | Real Estate/Other [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 489 | 508 |
Non-U.S. Plans [Member] | Real Estate/Other [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Non-U.S. Plans [Member] | Real Estate/Other [Member] | Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 489 | 508 |
Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 7,639 | 562 |
Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Fair Value of Plan Assets | 7,639 | 562 |
Non-U.S. Plans [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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