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Pension - Change in plan assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Pension
Expected return on plan assets	$ 162	$ 52	$ 472
Pension Plan
Pension
Fair value of plan assets as of April 30, 2024 and April 30, 2023, respectively	3,636	3,870
Expected return on plan assets	162	52
Benefits paid	(190)	(190)
Foreign currency exchange rate changes	209	(96)
Fair value of plan assets as of April 30, 2025 and April 30, 2024, respectively	$ 3,817	$ 3,636	$ 3,870

X

- Definition

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

+ References

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-Topic 715
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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.

+ References

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Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

+ References

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Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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