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Leases - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Weighted average remaining lease term (years) 13 years   13 years  
Operating lease expense $ 6.0 $ 3.6 $ 18.3 $ 10.3
Operating lease renewal term 25 years   25 years  
Weighted average discount rate 5.70%   5.70%