Leases - Rental Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Leases [Abstract]
Rental equipment, primarily wireless recording equipment	$ 117,210	$ 107,645
Accumulated depreciation and impairment	(50,225)	(45,583)
Rental equipment, net	$ 66,985	$ 62,062