PENSION BENEFIT PLANS - Net Periodic Pension Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Retirement Benefits [Abstract]
Service cost	$ 44	$ 52	$ 88	$ 104
Interest cost	88	93	180	186
Net periodic pension cost	$ 132	$ 145	$ 268	$ 290