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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
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |  |  |
Pension expense | $ (2,410) | $ (1,904) | $ (5,711) | $ (5,823)
Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |  |  |
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |  |  |
Pension expense | $ 1,600 | $ 1,400 | $ 4,600 | $ 4,100

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