Leases - Lease Cost - Other Information (Details)	Sep. 30, 2021	Sep. 30, 2020
Leases
Weighted-average remaining lease term - finance lease (in years)	3 years 9 months 18 days	3 years 10 months 24 days
Weighted-average remaining lease term - operating leases (in years)	3 years 4 months 24 days	2 years 4 months 24 days
Weighted-average discount rate - finance lease (as a percent)	4.60%	5.00%
Weighted-average discount rate - operating leases (as a percent)	4.90%	5.00%