EMPLOYEE BENEFIT PLANS Plan Allocations (Details)	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%	100.00%
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	25.40%	64.80%
Defined Benefit Plan, Actual Plan Asset Allocations	30.20%	51.10%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	34.80%	34.80%
Defined Benefit Plan, Actual Plan Asset Allocations	40.50%	33.40%
Property
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	7.40%	0.00%
Defined Benefit Plan, Actual Plan Asset Allocations	3.10%	0.00%
Other assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	32.40%	0.40%
Defined Benefit Plan, Actual Plan Asset Allocations	26.20%	15.50%