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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
	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income	$ 4.0	$ 3.8
Denominator:
Shares, basic	33.0	35.1
Effect of dilutive share-based awards	0.6	1.0
Shares, diluted	33.6	36.1
Net income per share:
Basic	$ 0.12	$ 0.11
Diluted	$ 0.12	$ 0.11

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- Definition

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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