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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
12 Months Ended
Jun. 30, 2018
Jun. 24, 2017
Jun. 25, 2016
Numerator:      
Net income $ (124.1) $ 48.8 $ 72.2
Denominator:      
Shares, basic 34.2 34.8 36.6
Effect of dilutive share-based awards   0.8 1.3
Shares, diluted 34.2 35.6 37.9
Net income per share:      
Basic $ (3.63) $ 1.40 $ 1.97
Diluted $ (3.63) $ 1.37 $ 1.91