EMPLOYEE BENEFIT PLANS Defined Benefit Plan Narrative (Details) $ in Millions	12 Months Ended
	Mar. 31, 2019 USD ($) Objectives Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Amortization, Next Fiscal Year | $	$ 6.8
Pension Plan Investment Strategy, Number Of Objectives | Objectives	3
Judicial Ruling [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (Decrease) in Obligation, Pension Benefits | $	$ 2.9
Unequal Guaranteed Minimum Pension Ruling, Period, Additional Expense Amortization	20 years
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $	$ 16.5
Pension Plan [Member] | UK Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number Of Original Closed Defined Benefit Pension Plans | Plans	2
Minimum Contribution Match	5.00%
Number Of Other Defined Contribution Plans | Plans	3
Number Of Other Defined Contribution Plans Closed To New Members | Plans	2
Pension Plan [Member] | UK Pension Plan [Member] | Other Employee [Member]
Defined Benefit Plan Disclosure [Line Items]
Closed Plan Maximum Contribution	7.00%
Pension Plan [Member] | UK Pension Plan [Member] | Pilot [Member]
Defined Benefit Plan Disclosure [Line Items]
Closed Plan Maximum Contribution	7.35%
Pension Plan [Member] | UK Pension Plan [Member] | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Average Period Salary	3 years
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	5.00%