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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

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