Leases - Weighted-Average Remaining Lease Term and Discount Rate Schedule (Details)	Mar. 31, 2021	Sep. 30, 2020
Weighted-average remaining lease term (years):
Finance leases	1 year 2 months 12 days	1 year 7 months 6 days
Operating leases	14 years 9 months 18 days	15 years 2 months 12 days
Weighted-average discount rate:
Finance leases	4.40%	4.80%
Operating leases	5.90%	5.90%