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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 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Numerator:        
Net income $ 20.5 $ 31.5 $ 79.3 $ 79.1
Denominator:        
Shares, basic 36.8 36.7 36.7 36.8
Effect of dilutive share-based awards 1.1 1.8 1.3 2.0
Shares, diluted 37.9 38.5 38.0 38.8
Net income per share:        
Basic $ 0.56 $ 0.86 $ 2.16 $ 2.15
Diluted $ 0.54 $ 0.82 $ 2.09 $ 2.04