Leases - Additional Information (Details)	9 Months Ended
	Jun. 30, 2020 extension_option
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term for operating leases (in years)	5 years 6 months 29 days
Weighted average incremental borrowing rate used to measure lease liabilities	8.25%
Minimum
Lessee, Lease, Description [Line Items]
Initial term of lease (in years)	3 years
Renewable term of lease (in years)	3 years
Maximum
Lessee, Lease, Description [Line Items]
Initial term of lease (in years)	10 years
Renewable term of lease (in years)	5 years
Corporate Office Lease, Two Five-Year Extension Options
Lessee, Lease, Description [Line Items]
Number of extensions	2
Renewable term of lease (in years)	5 years