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Employee Benefit Plans (Changes in Projected Benefit Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Changes in projected benefit obligations
Projected benefit obligations, beginning of the year	$ 207,551	$ 202,348
Service costs	13,195	14,693	$ 12,121
Interest costs	2,408	920	1,047
Plan participant contributions	6,870	6,092
Actuarial gain	(22,965)	(31,198)
Benefits paid	(2,646)	(3,904)
Transfer of prior vested benefits	11,579	14,963
Settlement	(15,348)	0
Curtailment	(3,923)	0
Administrative expense paid	(147)	(130)
Currency exchange rate changes	(1,238)	3,767
Projected benefit obligations, end of the year	$ 195,336	$ 207,551	$ 202,348

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- Definition

Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement

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- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of administration expense of defined benefit plan which decreases plan assets. Excludes plan administration expense paid by employer.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. 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.

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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees.

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