PENSION BENEFIT PLANS - Net Periodic Pension Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Retirement Benefits [Abstract]
Service cost	$ 52	$ 45	$ 104	$ 86
Interest cost	93	106	186	202
Net periodic pension cost	$ 145	$ 151	$ 290	$ 288