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Employee Benefit Plans (Projected Benefit Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Changes in projected benefit obligations
Projected benefit obligations, beginning of the year	$ 128,915	$ 114,640
Service costs	10,564	9,715	$ 10,385
Interest costs	1,301	1,126	800
Plan participant contributions	3,666	3,522
Actuarial gains (losses)	9,506	(1,580)
Benefits paid	(3,793)	(1,202)
Plan amendment related to statutory change	(705)	(2,519)
Settlement and curtailment	(335)	0
Administrative expense paid	(142)	(144)
Currency exchange rate changes and other	(5,315)	5,357
Projected benefit obligations, end of the year	$ 143,662	$ 128,915	$ 114,640

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- Definition

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

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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 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 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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