PENSION BENEFIT PLANS - Narrative (Details)	12 Months Ended
	Mar. 31, 2020 USD ($) employee	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement plan employee's contribution, percentage matched	50.00%
Retirement plan employee's contribution, percentage of match	6.00%
Retirement plan employer contributions vest at rate per year of service, percentage	25.00%
Retirement plan employer contributions	$ 6,700,000	$ 6,600,000	$ 8,000,000.0
Unrecognized actuarial gains, before tax	1,600,000
Unrecognized actuarial gains, net of tax	1,100,000
Employer direct benefit payments	359,000	$ 302,000
Amount expected to be recognized in net periodic pension costs in next fiscal year	0
Plan assets expected to be returned to the Company	$ 0
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of employees in the U.S. participating in noncontributory defined benefit pension plants | employee	0