Leases - Weighted-Average Remaining Lease Term and Discount Rate Schedule (Details)	Jun. 30, 2021	Sep. 30, 2020
Weighted-average remaining lease term (years):
Finance leases	1 year 1 month 6 days	1 year 7 months 6 days
Operating leases	14 years 7 months 6 days	15 years 2 months 12 days
Weighted-average discount rate:
Finance leases	3.90%	4.80%
Operating leases	5.90%	5.90%