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Business Acquisitions - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jul. 31, 2018
Jun. 30, 2020
Jun. 30, 2019
Business Acquisition [Line Items]      
Measurement period increase to goodwill   $ 0.0 $ 4.4
Counsyl Inc      
Business Acquisition [Line Items]      
Business acquisition consideration $ 405.9    
Cash payment on business acquisition 278.5    
Amount of cash consideration deposited in escrow account 5.0    
Return of escrow as result of working capital adjustment     1.1
Reduction of intangible assets related to updated assumptions     2.9
Decrease in deferred tax liability     1.9
Reduction of equipment related to updated assumptions     0.7
Measurement period increase to goodwill     (4.4)
Acquisition costs 6.8    
Revenue contributed by acquired entity     104.9
Operating expenses related to acquired entity     $ 67.6
Counsyl Inc | Developed screening processes      
Business Acquisition [Line Items]      
Acquired intangible assets $ 290.0    
Acquired intangible assets, valuation assumptions discount rate 12.50%    
Acquired intangible assets, estimated useful life 12 years    
Counsyl Inc | Common stock      
Business Acquisition [Line Items]      
Business acquisition, shares issued 3.0    
Business acquisition, value of shares issued $ 127.4    
Business acquisition, per share market closing price $ 42.53