PENSION BENEFIT PLANS - Defined Benefit Pension Plan (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, at beginning of year	$ 34,895	$ 33,464
Service cost	341	304	$ 407
Interest cost	603	704	718
Benefits paid and other	(359)	(302)
Actuarial loss (gain)	(1,644)	3,254
Foreign exchange rate impact	(1,031)	(2,529)
Benefit obligation, at end of year	32,805	34,895	33,464
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, at beginning of year	0	0
Employer direct benefit payments	359	302
Benefits paid and other	(359)	(302)
Fair value of plan assets, at end of year	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	341	304	407
Interest cost	603	704	718
Net periodic pension cost	$ 944	$ 1,008	$ 1,125
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	1.90%	1.80%	2.30%
Rate of compensation increase	3.00%	3.00%	2.25%

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.

Name:	us-gaap_DefinedBenefitPlanActuarialGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.