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Pension - Projected benefit obligation and fair value of plan assets (Details)
$ in Thousands
12 Months Ended
Apr. 30, 2025
USD ($)
employee
Apr. 30, 2024
USD ($)
Apr. 30, 2023
USD ($)
Pension      
Number of former employees | employee 3    
Pension Plan      
Pension      
Defined Benefit Plan, Funding Status [Extensible List] us-gaap:UnfundedPlanMember    
Projected benefit obligation $ (3,335) $ (3,246) $ (3,192)
Fair value of plan assets 3,817 $ 3,636 $ 3,870
Funded status of the plan $ 482