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Pension - Net benefit income (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Pension
Expected return on plan assets	$ 52	$ 472	$ 108
Interest cost	(119)	(70)	(39)
Actuarial loss	206	(167)	(179)
Net periodic benefit cost	$ (273)	$ 569	$ 248
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Investment Income, Interest	Investment Income, Interest	Investment Income, Interest

X

- Definition

Amount of benefit recognized for passage of time related to defined benefit plan.

+ References

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- Definition

Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of 10 percent of greater of fair value of plan assets or benefit obligation.

+ References

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-Topic 715
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X

- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

+ References

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- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

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- Definition

Indicates line item in statement of income or comprehensive income that includes components of net periodic benefit cost (credit), excluding service cost component, for defined benefit plan.

+ References

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