Pension Benefits (Narrative) (Details) $ in Thousands		3 Months Ended			9 Months Ended		12 Months Ended
	Apr. 30, 2020 plan	Jan. 31, 2022 USD ($)	Jan. 31, 2021 USD ($)	Jul. 31, 2020 plan	Jan. 31, 2022 USD ($)	Jan. 31, 2021 USD ($)	Apr. 30, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Pension settlement		$ 69,452	$ 0		$ 69,452	$ 0
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit pension plans | plan	1			2
Pension contribution					0		$ 0
Expected future employer contributions		0			$ 0
Pension settlement		$ 69,500