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Acquisitions - Pro Forma Results of Acquisitions (Detail) - Counsyl Inc [Member] - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Revenue	$ 186.3	$ 212.5
Income (loss) from operations	(20.9)	11.5
Net income (loss)	$ (20.6)	$ 8.6
Earnings (loss) per share, basic	$ (0.28)	$ 0.11
Earnings (loss) per share, diluted	$ (0.28)	$ 0.11

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