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Debt - Schedule of Debt (Details) - USD ($)	Sep. 30, 2025	Mar. 31, 2025	Aug. 27, 2024	May 31, 2024
Debt Instrument
Long-term debt	$ 612,500,000	$ 699,900,000
Current portion of debt	(3,800,000)	0
Non-current portion of debt	608,700,000	699,900,000
Senior Notes
Debt Instrument
Unamortized debt issuance costs	(12,600,000)	(15,100,000)
Debt instrument, interest rate, stated percentage				5.50%
Term Loan A \| Term Loan A
Debt Instrument
5.5% Senior Notes	300,000,000.0	0
5.500% Senior Notes due 2029 \| Senior Notes
Debt Instrument
5.5% Senior Notes	325,100,000	715,000,000.0		$ 625,100,000
Existing Notes \| Senior Notes
Debt Instrument
5.5% Senior Notes	$ 325,100,000			$ 325,100,000
Debt instrument, interest rate, stated percentage			5.50%	5.50%
Exchange Notes \| Senior Notes
Debt Instrument
5.5% Senior Notes		$ 389,900,000		$ 389,900,000
Debt instrument, interest rate, stated percentage				5.50%