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Accumulated Other Comprehensive Loss, Reclassification out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2022 | Jan. 31, 2021
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |  |  |
Pension expense | $ (2,738) | $ (3,012) | $ (8,401) | $ (8,257)
Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |  |  |
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |  |  |
Pension expense | $ 1,800 | $ 1,900 | $ 5,500 | $ 5,800

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