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Pension - Projected benefit obligation and fair value of plan assets (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2024 | 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 | $ (3,246) |  | $ (3,192) | $ (3,322)
Fair value of plan assets | 3,636 | $ 3,636 | $ 3,870 | $ 3,395
Funded status of the plan | $ 390 |  |  |

X
- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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