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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, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Numerator:        
Net income $ 4.5 $ 20.5 $ 31.0 $ 79.3
Denominator:        
Shares, basic 34.8 36.8 34.9 36.7
Effect of dilutive share-based awards 0.6 1.1 0.8 1.3
Shares, diluted 35.4 37.9 35.7 38.0
Net income per share:        
Basic $ 0.13 $ 0.56 $ 0.89 $ 2.16
Diluted $ 0.13 $ 0.54 $ 0.87 $ 2.09