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Business Acquisitions - Additional Information (Detail)
$ / shares in Units, $ in Millions
 12 Months Ended 21 Months Ended
Jul. 31, 2018
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Business Acquisition [Line Items]      
Goodwill, working capital adjustment reduction   $ 4.4  
Counsyl Inc [Member]      
Business Acquisition [Line Items]      
Business acquisition consideration $ 405.9    
Goodwill, working capital adjustment reduction     $ (1.1)
Intangible assets reduction due to assumptions related to contributory asset charges   2.9  
Decrease in deferred tax liabilities   1.9 1.9
Fair value equipment reduction   0.7 0.7
Increase in goodwill   4.4  
Acquired intangible assets 290.0    
Acquisition costs     $ 6.8
Revenue contributed by acquired entity   104.9  
Operating expenses related to acquired entity   67.6  
Counsyl Inc [Member] | Developed Screening Processes [Member]      
Business Acquisition [Line Items]      
Acquired intangible assets $ 290.0    
Intangible assets estimated useful lives 12 years    
Counsyl Inc [Member] | Developed Screening Processes [Member] | Measurement Input, Discount Rate [Member]      
Business Acquisition [Line Items]      
Estimated net cash flows, discount rate 12.5    
Counsyl Inc [Member] | 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    
Goodwill, working capital adjustment reduction   $ 1.1  
Counsyl Inc [Member] | 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