XML 88 R60.htm IDEA: XBRL DOCUMENT v3.21.2
Leases - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]      
Weighted average remaining lease term (years) 12 years    
Operating lease expense $ 24.1 $ 13.9 $ 12.8
Variable lease expense $ 0.7 $ 0.5 $ 0.4
Operating lease renewal term 25 years    
Weighted average discount rate 5.60%