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Pension and other postretirement plans - Additional Information (Detail) $ in Thousands	3 Months Ended
	Apr. 30, 2022 USD ($) plan retireeAndOtherBeneficiary
Retirement Benefits [Abstract]
Number of pension plans \| plan	2
Defined benefit plan, plan assets, amount \| $	$ 171,181
Number of retirees and other beneficiaries \| retireeAndOtherBeneficiary	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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