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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, 2016
Sep. 30, 2015
Numerator:    
Net income $ 3.7 $ 23.8
Denominator:    
Shares, basic 34.8 36.8
Effect of dilutive share-based awards 0.8 1.4
Shares, diluted 35.6 38.2
Net income per share:    
Basic $ 0.11 $ 0.65
Diluted $ 0.10 $ 0.62