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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
Sep. 30, 2017
Sep. 30, 2016
Numerator:    
Net income/(loss) $ (26.5) $ 3.7
Denominator:    
Shares, basic 33.5 34.8
Effect of dilutive share-based awards   0.8
Shares, diluted 33.5 35.6
Net income/(loss) per share:    
Basic $ (0.79) $ 0.11
Diluted $ (0.79) $ 0.10