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Net Income/(Loss) Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 30, 2018
Numerator:      
Net income/(loss) $ 118.8 $ (22.9) $ (124.1)
Denominator:      
Shares, basic 33.6 34.6 34.2
Effect of dilutive share-based awards 1.2    
Shares, diluted 34.8 34.6 34.2
Net income/(loss) per share:      
Basic $ 3.54 $ (0.66) $ (3.63)
Diluted $ 3.41 $ (0.66) $ (3.63)