Commitments and Contingencies - Insurance Proceeds Impact On Consolidated Condensed Statements Of Operation (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Loss Contingencies [Line Items]
Cost of goods sold	$ 101,817	$ 101,110
Loss (gain) on disposal and impairment of assets	(7,535)	(905)
Net loss	(7,506)	$ (7,170)
Balance without insurance proceeds
Loss Contingencies [Line Items]
Cost of goods sold	105,448
Loss (gain) on disposal and impairment of assets	820
Net loss	(19,492)
Insurance recoveries
Loss Contingencies [Line Items]
Cost of goods sold	(3,631)
Loss (gain) on disposal and impairment of assets	(8,355)
Net loss	$ (11,986)