Leases - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Leases [Line Items]
Operating lease, right-of-use asset	$ 100,000
Sales-type leases	0
Lease receivables from customers, net of reserves	9,300,000
Rental revenue	53,699,000	$ 49,962,000
Future minimum lease payments to be received	0
Rental equipment depreciation expense	$ 17,945,000	$ 13,713,000
Maximum
Leases [Line Items]
Lease term	6 months