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Pension - Projected benefit obligation and fair value of plan assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Pension      
Defined Benefit Plan, Funding Status [Extensible List] us-gaap:UnderfundedPlanMember us-gaap:UnderfundedPlanMember  
Pension Plan      
Pension      
Projected benefit obligation $ (3,192) $ (3,322) $ (4,126)
Fair value of plan assets 3,870 3,395 $ 3,951
Funded status of the plan $ 678 $ 73