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Leases - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Weighted average remaining lease term (years) 13 years  
Operating lease expense $ 5.8 $ 3.3
Operating lease renewal term 25 years  
Weighted average discount rate 5.70%