DEBT (Details)	3 Months Ended	9 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2020
Line of Credit Facility [Line Items]
Letters of credit outstanding, amount	$ 300,000.0	$ 300,000.0
Extension period		1 year
Interest rate, percentage	4.50%	4.50%
Commitment fee percentage		0.50%
Unused borrowing capacity, fee		$ 1,100,000	$ 900,000
Interest rate, effective percentage	5.80%	5.80%		5.80%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 685,000,000.0	$ 685,000,000.0
Amount outstanding	539,600,000	539,600,000
Unused amount available	124,000,000.0	124,000,000.0
Additional borrowing capacity	$ 21,100,000	21,100,000
Debt covenants minimum net worth		$ 325,000,000
Fixed conversion ratio	2.75
Debt covenant, maximum ratio of total debt		2.0
Debt covenant, maximum collateral performance indicator percentage		24.00%
Expiration period		30 days
Minimum
Line of Credit Facility [Line Items]
Interest rate, percentage	3.50%	3.50%
Maximum
Line of Credit Facility [Line Items]
Interest rate, percentage	4.50%	4.50%