EMPLOYEE BENEFIT PLANS Actuarial Assumptions (Details) - Pension Plan [Member]	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
UK Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.40%	3.30%	3.30%
Expected long-term rate of return on assets	4.41%	5.30%	5.40%
Pension increase rate	3.00%	2.80%	2.80%
Norway pension plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			2.50%
Rate of compensation increase			3.50%
Social Security increase amount			3.25%
Expected long-term rate of return on assets			1.50%
Pension increase rate			0.00%