Commitments and Contingencies - Insurance Proceeds Impact on Consolidated Condensed Statements of Operation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Loss Contingencies [Line Items]
Gain on insurance proceeds received	$ (1,683)	$ (3,304)	$ (2,683)	$ (4,468)
Cost of goods sold	23,628	23,486	70,771	75,119
Income (loss) before income tax (benefit) expense	2,283	$ (7,706)	4,067	$ (10,727)
Balance without insurance proceeds
Loss Contingencies [Line Items]
Cost of goods sold, balance without insurance proceeds	23,944		73,374
Gain on insurance proceeds received	0		0
Income (loss) before income tax (benefit) expense, balance without insurance proceeds	284		(1,219)
Insurance recoveries
Loss Contingencies [Line Items]
Gain on insurance proceeds received	(1,683)		(2,683)
Cost of goods sold | Insurance recoveries
Loss Contingencies [Line Items]
Gain on insurance proceeds received	(316)		(2,603)
Income (loss) before income tax (benefit) expense | Insurance recoveries
Loss Contingencies [Line Items]
Gain on insurance proceeds received	$ (1,999)		$ (5,286)