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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Goodwill And Intangible Assets [Line Items]        
Total amortization expense related to intangible assets $ 1.4   $ 2.3  
iGenomX        
Goodwill And Intangible Assets [Line Items]        
Increase in goodwill     63.2  
Increase in intangible assets     $ 46.5  
Maximum        
Goodwill And Intangible Assets [Line Items]        
Total amortization expense related to intangible assets   $ 0.1   $ 0.1