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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. 27, 2015
Jun. 28, 2014
Jun. 29, 2013
Numerator:      
Net income $ 110.4 $ 46.7 $ 98.9
Denominator:      
Shares, basic 36.9 34.8 32.7
Effect of dilutive share-based awards 2.0 2.3 1.5
Shares, diluted 38.9 37.1 34.2
Net income per share:      
Basic $ 2.99 $ 1.34 $ 3.03
Diluted $ 2.84 $ 1.26 $ 2.89