Leases - Rental Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Rental Equipment [Abstract]
Rental equipment, primarily wireless recording equipment	$ 114,783	$ 107,645
Accumulated depreciation and impairment	(60,466)	(45,583)
Rental equipment, net	$ 54,317	$ 62,062