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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 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Numerator:        
Net income/(loss) $ (82.4) $ 22.8 $ (108.9) $ 26.5
Denominator:        
Shares, basic 34.1 35.1 33.8 35.0
Effect of dilutive share-based awards   0.8   0.7
Shares, diluted 34.1 35.9 33.8 35.7
Net income/(loss) per share:        
Basic $ (2.42) $ 0.65 $ (3.22) $ 0.76
Diluted $ (2.42) $ 0.64 $ (3.22) $ 0.74