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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, 2023 | Oct. 31, 2022 | Oct. 31, 2023 | Oct. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Pension expense | $ 1,582 | $ (409) | $ 3,175 | $ (903)
Reclassification out of Accumulated Other Comprehensive Loss |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Pension expense | $ 2,000 | $ 1,400 | $ 3,900 | $ 2,900

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