Leases - Summary of Lease Term and Incremental Borrowing Rates for Leases (Details)	Dec. 31, 2021	Sep. 30, 2021
Weighted-average remaining lease term (in months):
Operating leases	46 months 27 days	52 months 6 days
Finance leases	44 months 18 days	47 months 3 days
Weighted-average discount rate:
Operating leases	4.50%	5.10%
Finance leases	4.40%	4.40%