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Pension and other postretirement plans - Additional Information (Details) $ in Thousands	Apr. 30, 2022 USD ($) segment
Retirement Benefits [Abstract]
Defined benefit plan, plan assets, amount \| $	$ 171,181
Number of retirees and other beneficiaries \| segment	1,500

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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