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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. 29, 2019
Jun. 30, 2018
Jun. 24, 2017
Numerator:      
Net income/(loss) $ (22.9) $ (124.1) $ 48.8
Denominator:      
Shares, basic 34.6 34.2 34.8
Effect of dilutive share-based awards     0.8
Shares, diluted 34.6 34.2 35.6
Net income/(loss) per share:      
Basic $ (0.66) $ (3.63) $ 1.40
Diluted $ (0.66) $ (3.63) $ 1.37