v3.26.1
DEBT - Schedule of Debt (Details) - USD ($)
$ in Millions
Jun. 28, 2026
Sep. 30, 2025
Debt Instrument [Line Items]    
Total debt $ 633.0 $ 581.4
Unamortized discount on debt (2.3) 0.0
Debt issuance costs (14.9) (13.5)
Less current portion (12.2) (11.7)
Long-term debt, net of current portion 603.6 556.2
HPC Term Loan    
Debt Instrument [Line Items]    
Revolver facility $ 60.0 $ 0.0
Stated interest rate 9.10% 0.00%
3.375% Exchangeable Notes, due June 1, 2029    
Debt Instrument [Line Items]    
Secured debt $ 350.0 $ 350.0
Stated interest rate 3.40% 3.40%
5.00% Notes, due October 1, 2029    
Debt Instrument [Line Items]    
Secured debt $ 4.9 $ 4.9
Stated interest rate 5.00% 5.00%
5.50% 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 3.90% 3.90%
Obligations under finance leases    
Debt Instrument [Line Items]    
Obligations under finance leases $ 76.9 $ 85.3
Stated interest rate 5.60% 5.60%