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