EMPLOYEE BENEFIT PLANS Plan Allocations (Details)	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%	100.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	25.40%	25.40%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	24.10%	30.20%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	34.80%	34.80%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	44.50%	40.50%
Property
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	7.40%	7.40%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	6.10%	3.10%
Other assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	32.40%	32.40%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	25.30%	26.20%