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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, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |  |  |
Pension expense | $ (2,809) | $ (2,683) | $ (5,663) | $ (5,245)
Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |  |  |
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |  |  |
Pension expense | $ 1,900 | $ 2,000 | $ 3,700 | $ 3,900

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