DEBT - Credit Agreement (Details)			3 Months Ended		6 Months Ended
	May 19, 2025 USD ($) extension	May 23, 2022 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Mar. 31, 2025 USD ($)
Debt Instrument [Line Items]
Outstanding borrowings			$ 2,531,300,000		$ 2,531,300,000		$ 2,528,500,000
Credit Agreement
Debt Instrument [Line Items]
Amount of additional borrowings by which maximum borrowing capacity may be increased	$ 250,000,000.0
Amount of additional borrowings by which maximum borrowing capacity may be increased, percent	35.00%
Debt issuance cost			4,900,000		4,900,000
Amortization of debt issuance costs			100,000	$ 100,000	300,000	$ 300,000
Available borrowings			997,800,000		997,800,000		$ 747,800,000
Credit Agreement | 2022 Credit Agreement
Debt Instrument [Line Items]
Outstanding borrowings			$ 0		$ 0
Credit Agreement | Base rate
Debt Instrument [Line Items]
Interest rate at end of period			7.25%		7.25%
Credit Agreement | SOFR
Debt Instrument [Line Items]
Interest rate at end of period			4.13%		4.13%
Credit Agreement | Minimum | Base rate
Debt Instrument [Line Items]
Interest rate added to base rate					0.00%
Credit Agreement | Minimum | SOFR
Debt Instrument [Line Items]
Interest rate added to base rate					1.00%
Credit Agreement | Maximum | Base rate
Debt Instrument [Line Items]
Interest rate added to base rate					0.625%
Credit Agreement | Maximum | SOFR
Debt Instrument [Line Items]
Interest rate added to base rate					1.625%
Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Debt term		5 years
Maximum borrowing capacity	$ 1,000,000,000	$ 750,000,000.0
Extension term	1 year
Number of extensions | extension	2
Letter of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 200,000,000.0