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Business Acquisitions - Pro Forma Results of Acquisitions (Detail) - Counsyl Inc [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Revenue	$ 861.3	$ 881.8
Income from operations	17.9	74.3
Net income	$ 13.8	$ 73.0
Net income per share, basic	$ 0.19	$ 1.01
Net income per share, diluted	$ 0.18	$ 0.98

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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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