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Acquisitions - Pro Forma Results of Acquisitions (Detail) - Counsyl Inc [Member] - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Revenue	$ 195.1	$ 216.8	$ 381.4	$ 429.3
Income (loss) from operations	(8.8)	6.1	(29.7)	17.6
Net income (loss)	$ (8.3)	$ 2.6	$ (28.9)	$ 11.2
Earnings (loss) per share, basic	$ (0.11)	$ 0.04	$ (0.39)	$ 0.15
Earnings (loss) per share, diluted	$ (0.11)	$ 0.03	$ (0.39)	$ 0.15

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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