DEBT - Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2025	Sep. 30, 2025
Debt Instrument [Line Items]
Long-term debt	$ 659.0	$ 919.4
Less: deferred financing costs	3.9	4.6
Long-term debt, net	655.1	914.8
Term Loan | 2022 Credit Agreement - Term Loans
Debt Instrument [Line Items]
Long-term debt	400.3	784.1
Term Loan | 2023 Credit Agreement - Term Loan
Debt Instrument [Line Items]
Long-term debt	69.1	135.3
2022 Credit Agreement - Revolving Credit Facility | 2022 Credit Agreement - Term Loans
Debt Instrument [Line Items]
Long-term debt	$ 189.6	$ 0.0