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BENEFIT PLANS - Net periodic pension cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
BENEFIT PLANS
Interest cost on projected benefit obligation	$ 503	$ 504
Expected return on assets	(1,535)	(1,409)
Plan expenses	150	340
Recognized net actuarial loss	392	529
Net periodic pension cost	$ (490)	$ (36)

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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.

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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.

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

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