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Business Acquisitions - Summary of Changes to Goodwill Balance (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Goodwill [Line Items]      
Beginning balance   $ 318.6 [1] $ 316.1
Working capital adjustment   4.4 1.9
Ending balance $ 417.2 417.2 $ 318.6 [1]
Counsyl Inc [Member]      
Goodwill [Line Items]      
Beginning balance 94.9    
Fair value adjustment to equipment 0.7 0.7  
Intangible adjustment 2.9 2.9  
Working capital adjustment (1.1) (1.1)  
Change in deferred tax liability 1.9 1.9  
Ending balance $ 99.3 $ 99.3  
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.