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Acquisitions - Additional Information (Detail) - Counsyl Inc [Member]
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Business Acquisition [Line Items]        
Business acquisition consideration $ 405.9      
Intangible assets reduction due to assumptions related to contributory asset charges   $ 2.0 $ 2.9  
Increase in deferred tax liabilities   1.2    
Change in NOL offset   1.8    
Reduction in deferred tax liabilities due to change in fair value of intangibles   0.6    
Increase in goodwill   3.2 3.2 $ 3.2
Acquired intangible assets $ 290.0      
Acquisition costs   6.8 $ 6.8 6.8
Revenue contributed by acquired entity   32.6   88.1
Operating expenses related to acquired entity   $ 43.7   $ 132.9
Measurement Input, Discount Rate [Member]        
Business Acquisition [Line Items]        
Estimated net cash flows, discount rate 12.5      
Developed Screening Processes [Member]        
Business Acquisition [Line Items]        
Acquired intangible assets $ 290.0      
Intangible assets estimated useful lives 12 years      
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