DEBT - Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2026	Sep. 30, 2025
Debt Instrument [Line Items]
Long-term debt	$ 717.5	$ 919.4
Less: current portion	12.5	0.0
Less: deferred financing costs	3.8	4.6
Long-term debt, net	701.2	914.8
Term Loan | 2026 Credit Agreement - Term Loans
Debt Instrument [Line Items]
Long-term debt	500.0	0.0
Term Loan | 2023 Credit Agreement - Term Loans
Debt Instrument [Line Items]
Long-term debt	0.0	135.3
Term Loan | 2022 Credit Agreement - Term Loans
Debt Instrument [Line Items]
Long-term debt	0.0	784.1
2026 Credit Agreement - Revolving Credit Facility | 2026 Credit Agreement - Term Loans
Debt Instrument [Line Items]
Long-term debt	$ 217.5	$ 0.0