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Pension Benefits (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2019 | Apr. 30, 2019
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract] |  |
Expected company contributions to pension plan in current fiscal year | $ 0.5 |
Pension contribution | $ 0.3 | $ 7.3

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