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Acquisitions - Additional Information (Detail) - Counsyl Inc [Member] $ / shares in Units, $ in Millions | Jul. 31, 2018 USD ($) $ / shares shares
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Business Acquisition [Line Items] |
Business acquisition consideration | $ 405.9
Acquisition costs | 6.8
Acquired intangible assets | 290.0
Developed Screening Processes [Member] |
Business Acquisition [Line Items] |
Acquired intangible assets | $ 290.0
Intangible assets estimated useful lives | 12 years
Developed Screening Processes [Member] | Measurement Input, Discount Rate [Member] |
Business Acquisition [Line Items] |
Estimated net cash flows, discount rate | 12.5
Agreement and Plan of Merger [Member] |
Business Acquisition [Line Items] |
Effective date of business acquisition | Jul. 31, 2018
Business acquisition consideration | $ 405.9
Cash payment on business acquisition | 278.5
Amount of cash consideration deposited in escrow account | $ 5.0
Agreement and Plan of Merger [Member] | Common Stock [Member] |
Business Acquisition [Line Items] |
Business acquisition, shares issued | shares | 2,994,251
Business acquisition, shares issued, value | $ 127.4
Business acquisition, per share market closing price | $ / shares | $ 42.53

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