Commitments and Contingencies - Insurance Proceeds Impact on Consolidated Condensed Statements of Operation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Loss Contingencies [Line Items]
Gain on insurance proceeds received	$ 0	$ (1,683)	$ (2,495)	$ (2,683)
Cost of goods sold	22,040	23,628	65,317	70,771
Income (loss) before income tax (benefit) expense	$ 218	$ 2,283	980	4,067
Balance without insurance proceeds
Loss Contingencies [Line Items]
Cost of goods sold, balance without insurance proceeds			65,921	73,374
Gain on insurance proceeds received			0	0
Income (loss) before income tax (benefit) expense, balance without insurance proceeds			(2,119)	(1,219)
Insurance recoveries
Loss Contingencies [Line Items]
Gain on insurance proceeds received			(2,495)	(2,683)
Insurance recoveries | Cost of goods sold
Loss Contingencies [Line Items]
Gain on insurance proceeds received			(604)	(2,603)
Insurance recoveries | Income (loss) before income tax (benefit) expense
Loss Contingencies [Line Items]
Gain on insurance proceeds received			$ (3,099)	$ (5,286)