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Leases - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]    
Weighted average remaining lease term (years) 10 years  
Operating lease expense $ 10.3 $ 9.7
Operating lease renewal term 25 years  
Weighted average discount rate 7.30%