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Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Dec. 25, 2021
Sep. 25, 2021
Dec. 26, 2020
Sep. 26, 2020
Dec. 25, 2021
Dec. 26, 2020
Numerator:            
Net income $ 69.5 $ 40.2 $ 49.6 $ (2.8) $ 109.7 $ 46.8
Denominator:            
Shares, basic 39.4   34.8   38.5 34.5
Effect of dilutive share-based awards and convertible notes 1.3   1.7   2.2 1.9
Shares, diluted 40.7   36.5   40.7 36.4
Net income per share:            
Basic $ 1.76   $ 1.43   $ 2.85 $ 1.36
Diluted $ 1.71   $ 1.36   $ 2.70 $ 1.29