EMPLOYEE BENEFIT PLANS Rollforward of Change in Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation (PBO) at beginning of period	$ 517,186	$ 525,053
Service cost	856	627	$ 8,243
Interest cost	12,914	15,330	20,108
Actuarial loss (gain)	(19,930)	73,622
Benefit payments and expenses	(27,002)	(26,456)
Effect of exchange rate changes	61,104	(70,990)
Projected benefit obligation (PBO) at end of period	$ 545,128	$ 517,186	$ 525,053