Leases - Rental Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Rental Equipment [Abstract]
Rental equipment, primarily wireless recording equipment	$ 94,194	$ 95,827
Accumulated depreciation and impairment	(58,379)	(56,922)
Rental equipment, net	$ 35,815	$ 38,905