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Collaborative Arrangement - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]            
Deferred revenue, total $ 1.6 $ 6.8        
Abbott Agreement [Member]            
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]            
Collaborative arrangement payment received 87.8          
Deferred revenue, total $ 1.5          
Abbott Agreement [Member] | Upfront Payment [Member]            
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]            
Collaborative arrangement payment received           $ 25.0
Abbott Agreement [Member] | Milestone Payment [Member]            
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]            
Collaborative arrangement payment received   $ 27.0 $ 15.0 $ 10.8 $ 10.0