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EARNINGS PER COMMON SHARE - Calculation of Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Dec. 30, 2023
Dec. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net loss $ (80.5) $ (64.7)
Basic net loss per common share:    
Weighted-average common shares outstanding during the period (in shares) 56,700,000 55,500,000
Basic income (loss) per common share (USD per share) $ (1.42) $ (1.17)
Diluted net loss per common share:    
Weighted-average common shares outstanding during the period (in shares) 56,700,000 55,500,000
Dilutive potential Common Shares (in shares) 0 0
Weighted-average common shares outstanding during the period plus dilutive potential common shares (in shares) 56,700,000 55,500,000
Diluted income (loss) per common share (USD per share) $ (1.42) $ (1.17)
Anti-dilutive stock options outstanding (in shares) 500,000 200,000
Options    
Diluted net loss per common share:    
Anti-dilutive stock options outstanding (in shares) 1,000,000.0 900,000