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DEBT - Schedule of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	May 23, 2024	Sep. 24, 2019
Debt Instrument [Line Items]
Obligations under finance leases	$ 85.3
Total debt	581.4	$ 577.7
Debt issuance costs	(13.5)	(16.9)
Less current portion	(11.7)	(9.4)
Long-term debt, net of current portion	556.2	551.4
Revolving Credit Facility
Debt Instrument [Line Items]
Revolver facility	$ 0.0	$ 0.0
Stated interest rate	0.00%	0.00%
3.375% Exchangeable Notes, due June 1, 2029
Debt Instrument [Line Items]
Secured debt	$ 350.0	$ 350.0
Stated interest rate	3.375%	3.40%	3.375%
5.00% Notes, due October 1, 2029
Debt Instrument [Line Items]
Secured debt	$ 4.9	$ 4.9
Stated interest rate	5.00%	5.00%		5.00%
5.50% Notes, due July 15, 2030
Debt Instrument [Line Items]
Secured debt	$ 13.2	$ 13.2
Stated interest rate	5.50%	5.50%
3.875% Notes, due March 15, 2031
Debt Instrument [Line Items]
Secured debt	$ 128.0	$ 128.0
Stated interest rate	3.875%	3.90%
Obligations under finance leases
Debt Instrument [Line Items]
Stated interest rate	5.60%	5.40%
Obligations under finance leases	$ 85.3	$ 81.6