Commitments and Contingencies - Insurance Proceeds Impact On Consolidated Condensed Statements Of Operation (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Loss Contingencies [Line Items]
Gain on insurance recoveries	$ (2,397)	$ (5,874)
Cost of goods sold	88,386	93,611
Income (loss) before income tax benefit	(1,965)	8,980
Balance without insurance proceeds
Loss Contingencies [Line Items]
Cost of goods sold, balance without insurance proceeds	88,990	96,711
Gain on insurance recoveries	0	0
Income (loss) before income tax (benefit) expense, balance without insurance proceeds	(4,966)	6
Insurance recoveries
Loss Contingencies [Line Items]
Gain on insurance recoveries	(2,397)	(5,874)
Insurance recoveries | Cost of goods sold
Loss Contingencies [Line Items]
Gain on insurance recoveries	(604)	(3,100)
Insurance recoveries | Income (loss) before income tax benefit
Loss Contingencies [Line Items]
Gain on insurance recoveries	$ (3,001)	$ (8,974)