Leases - Weighted Average Remaining Lease Term and Discount Rate (Details)	Sep. 30, 2021	Sep. 30, 2020
Weighted average remaining lease term (in years):
Finance lease, weighted average remaining lease term	7 years 7 months 6 days	8 years 7 months 6 days
Operating lease, weighted average remaining lease term	1 year 10 months 24 days	2 years 9 months 18 days
Weighted average discount rate:
Finance lease, weighted average discount rate, percent	5.04%	5.04%
Operating lease, weighted average discount rate, percent	5.75%	5.75%