Commitments and Contingencies - Insurance Proceeds Impact on Consolidated Condensed Statements of Operation (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Gain on insurance proceeds received	$ (2,495)	$ 0
Cost of goods sold	21,155	22,883
Income (loss) before income tax (benefit) expense	2,088	(1,437)
Balance without insurance proceeds
Loss Contingencies [Line Items]
Cost of goods sold, balance without insurance proceeds	21,759	24,053
Gain on insurance proceeds received	0
Income (loss) before income tax (benefit) expense, balance without insurance proceeds	(1,011)	(2,607)
Insurance recoveries
Loss Contingencies [Line Items]
Gain on insurance proceeds received	(2,495)
Insurance recoveries | Cost of goods sold
Loss Contingencies [Line Items]
Gain on insurance proceeds received	(604)	(1,170)
Insurance recoveries | Income (loss) before income tax (benefit) expense
Loss Contingencies [Line Items]
Gain on insurance proceeds received	$ (3,099)	$ (1,170)