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Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Dec. 28, 2024
Sep. 28, 2024
Dec. 30, 2023
Sep. 30, 2023
Dec. 28, 2024
Dec. 30, 2023
Numerator:            
Net income (loss) $ 1.8 $ (23.1) $ (9.0) $ (55.6) $ (21.3) $ (64.6)
Denominator:            
Shares, basic (in shares) 39.7   39.2   39.7 38.9
Effect of dilutive share-based awards (in shares) 0.1   0.0   0.0 0.0
Diluted (in shares) 39.8   39.2   39.7 38.9
Net income (loss) per share:            
Basic (in dollars per share) $ 0.05   $ (0.23)   $ (0.54) $ (1.66)
Diluted (in dollars per share) $ 0.05   $ (0.23)   $ (0.54) $ (1.66)