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Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Dec. 30, 2023
Sep. 30, 2023
Dec. 24, 2022
Sep. 24, 2022
Dec. 30, 2023
Dec. 24, 2022
Numerator:            
Net Income (Loss) $ (9.0) $ (55.6) $ 22.0 $ 64.6 $ (64.6) $ 86.6
Denominator:            
Shares, basic 39.2   39.8   38.9 39.8
Effect of dilutive share-based awards and convertible notes 0   0.4   0 0.7
Shares, diluted 39.2   40.2   38.9 40.5
Net (loss) income per share:            
Basic $ (0.23)   $ 0.55   $ (1.66) $ 2.18
Diluted $ (0.23)   $ 0.55   $ (1.66) $ 2.14