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Commitments and contingencies - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Feb. 06, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Operating lease expense   $ 7.9    
Operating lease payment   $ 9.0    
Operating lease rental expenses     $ 4.9 $ 2.5
Operating lease prepaid rent     1.6  
Operating lease deferred rent     $ 0.0  
Lease weighted-average remaining lease term   5 years 6 months    
Lease weighted average discount rate   7.00%    
Agilent [Member]        
Litigation settlement amount $ 22.5      
Number of days from the settlement agreement pursuant to which litigation claims are to be settled 14 days