Employee Benefit Plans (Changes in Projected Benefit Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Changes in projected benefit obligations
Projected benefit obligations, beginning of the year	$ 213,477	$ 195,336
Service costs	11,875	11,479	$ 13,195
Interest costs	3,298	3,844	2,408
Plan participant contributions	6,676	6,731
Actuarial loss	13,691	13,737
Benefits paid	(10,578)	(2,405)
Transfer of prior vested benefits	15,301	6,775
Plan amendments	909	380
Settlement	0	(22,522)
Administrative expense paid	(157)	(158)
Currency exchange rate changes	4,649	280
Projected benefit obligations, end of the year	$ 259,141	$ 213,477	$ 195,336

Defined Benefit Plan, Benefit Obligation, Administrative Expense Paid

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Defined Benefit Plan, Benefit Obligation, Transfer of Vested Benefits

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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 actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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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 payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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