EMPLOYEE BENEFIT PLANS Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Retirement Benefits [Abstract]
Service cost	$ 655	$ 856	$ 627
Interest cost	12,984	12,914	15,330
Expected return on assets	(17,118)	(21,184)	(21,697)
Amortization of unrecognized losses	8,001	8,151	7,266
Net periodic pension cost	$ 4,522	$ 737	$ 1,526