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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, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Numerator:            
Net income/(loss) $ 49.6 $ (2.8) $ 19.8 $ 4.0 $ 46.8 $ 23.8
Denominator:            
Shares, basic 34.8   33.5   34.5 33.2
Effect of dilutive share-based awards and convertible notes 1.7   0.9   1.9 0.9
Shares, diluted 36.5   34.4   36.4 34.1
Net income per share:            
Basic $ 1.43   $ 0.59   $ 1.36 $ 0.72
Diluted $ 1.36   $ 0.58   $ 1.29 $ 0.70