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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 9 Months Ended
Mar. 27, 2021
Dec. 26, 2020
Sep. 26, 2020
Mar. 28, 2020
Dec. 28, 2019
Sep. 28, 2019
Mar. 27, 2021
Mar. 28, 2020
Numerator:                
Net income/(loss) $ 13.8 $ 49.6 $ (2.8) $ 5.0 $ 19.8 $ 4.0 $ 60.6 $ 28.8
Denominator:                
Shares, basic 35.0     34.0     34.7 33.5
Effect of dilutive share-based awards and convertible notes 4.1     1.0     2.8 1.0
Shares, diluted 39.1     35.0     37.5 34.5
Net income per share:                
Basic $ 0.39     $ 0.15     $ 1.75 $ 0.86
Diluted $ 0.35     $ 0.14     $ 1.62 $ 0.83