LONG TERM DEBT AND FINANCE LEASE LIABILITIES - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 16, 2025	Sep. 30, 2024
Debt Instrument [Line Items]
Total principal amount of debt	$ 845.8		$ 922.8
Finance Lease, Liability	15.5		16.4
Unamortized deferred financing costs	(13.6)		(5.3)
Total carrying value of debt and finance lease liabilities	847.7		933.9
Current portion of long-term debt	0.0		(7.5)
Current portion of finance lease liabilities	(7.9)		(5.2)
Total long-term carrying value of debt and finance lease liabilities	839.8		921.2
Term Loan due May 2028 | Line of Credit
Debt Instrument [Line Items]
Total principal amount of debt	0.0		193.8
Revolving Credit Facility due May 2028 | Line of Credit
Debt Instrument [Line Items]
Total principal amount of debt	$ 0.0		190.1
Senior Notes June 2030 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	8.00%	8.00%
Total principal amount of debt	$ 650.0		$ 0.0
Secured Debt:
Debt Instrument [Line Items]
Stated interest rate (as a percent)	6.75%
Secured Debt: | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	6.75%	6.75%	6.75%
Total principal amount of debt	$ 150.0		$ 500.0
AR Securitization Facility expires March 2027 | Line of Credit
Debt Instrument [Line Items]
Total principal amount of debt	$ 45.8		$ 38.9