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EARNINGS PER COMMON SHARE - Calculation of Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net loss $ (69.5) $ (80.5)
Basic net loss per common share:    
Weighted-average common shares outstanding during the period (in shares) 57,300,000 56,700,000
Basic income (loss) per common share (USD per share) $ (1.21) $ (1.42)
Diluted net loss per common share:    
Weighted-average common shares outstanding during the period (in shares) 57,300,000 56,700,000
Dilutive potential Common Shares (in shares) 0 0
Weighted-average common shares outstanding during the period plus dilutive potential common shares (in shares) 57,300,000 56,700,000
Diluted income (loss) per common share (USD per share) $ (1.21) $ (1.42)
Anti-dilutive stock options outstanding (in shares) 1,500,000 500,000
Options    
Diluted net loss per common share:    
Anti-dilutive stock options outstanding (in shares) 200,000 1,000,000.0