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Accumulated Other Comprehensive Loss, Reclassification out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
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Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |  |
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |  |
Pension expense | $ 6.4 | $ 5.5 | $ 5.9

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