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Pension Benefits (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 30, 2020 USD ($) | Jul. 31, 2021 USD ($) | Apr. 30, 2021 plan | Oct. 31, 2020 USD ($) plan | Apr. 30, 2022 USD ($) | Apr. 30, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Number of defined benefit pension plans | plan |  |  | 2 | 1 |  |
Pension contribution |  | $ 0 |  | $ 0 |  |
Forecast |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Pension contribution |  |  |  |  | $ 2,500 |
Pension Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Expected termination costs | $ 1,600 | $ 200 |  |  |  | $ 400

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