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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, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net income	$ 19.8	$ 4.0	$ 12.8	$ 3.8	$ 23.8	$ 16.6
Denominator:
Shares, basic	33.5		34.5		33.2	34.8
Effect of dilutive share-based awards	0.9		0.6		0.9	0.8
Shares, diluted	34.4		35.1		34.1	35.6
Net income per share:
Basic	$ 0.59		$ 0.37		$ 0.72	$ 0.48
Diluted	$ 0.58		$ 0.36		$ 0.70	$ 0.47

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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