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Accumulated Other Comprehensive Loss, Reclassification out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |  |  |
Pension expense | $ (881) | $ (1,872) | $ (3,301) | $ (3,919)
Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |  |  |
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |  |  |
Pension expense | $ 1,700 | $ 1,400 | $ 3,000 | $ 2,800

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