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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, 2015
Sep. 30, 2014
Numerator:    
Net income $ 23.8 $ 26.6
Denominator:    
Shares, basic 36.8 37.0
Effect of dilutive share-based awards 1.4 2.2
Shares, diluted 38.2 39.2
Net income per share:    
Basic $ 0.65 $ 0.72
Diluted $ 0.62 $ 0.68