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Accumulated Other Comprehensive Loss, Reclassification out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2022 | Jul. 31, 2021
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |
Pension expense | $ (494) | $ (2,854)
Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |
Pension expense | $ 1,500 | $ 1,800

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