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LONG-TERM DEBT AND FINANCE LEASE LIABILITIES - Schedule of Long-Term Debt and Finance Lease Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2026	Sep. 30, 2025	Jun. 16, 2025	Nov. 30, 2019
Debt Instrument [Line Items]
Total principal amount of debt	$ 728.0	$ 845.8
Finance lease liabilities	11.5	15.5
Unamortized deferred financing costs	(11.4)	(13.6)
Total carrying value of debt and finance lease liabilities	728.1	847.7
Current portion of finance lease liabilities	(5.6)	(7.9)
Total long-term carrying value of debt and finance lease liabilities	722.5	839.8
Line of Credit \| Revolving Credit Facility due May 2028
Debt Instrument [Line Items]
Total principal amount of debt	35.0	0.0
Line of Credit \| Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Total principal amount of debt	$ 43.0	$ 45.8
Senior Notes \| 0.08 Senior Notes due July 2030
Debt Instrument [Line Items]
Stated interest rate	8.00%	8.00%	8.00%
Total principal amount of debt	$ 650.0	$ 650.0
Senior Notes \| 6.75% Senior Notes due December 2027
Debt Instrument [Line Items]
Stated interest rate	6.75%	6.75%	6.75%	6.75%
Total principal amount of debt	$ 0.0	$ 150.0