PENSION BENEFIT PLANS - Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Retirement Benefits [Abstract]
Service cost	$ 333	$ 341	$ 304
Interest cost	667	603	704
Net periodic pension cost	$ 1,000	$ 944	$ 1,008