Commitments and Contingencies - Insurance Proceeds Impact On Consolidated Condensed Statements Of Operation (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Cost of goods sold, balance without insurance proceeds	$ 24,053
Cost of goods sold	22,883	$ 26,330
Net loss, balance without insurance proceeds	(2,512)
Net loss	(1,342)	$ (1,282)
Cost of goods sold
Loss Contingencies [Line Items]
Gain on insurance proceeds received	(1,170)
Net loss
Loss Contingencies [Line Items]
Gain on insurance proceeds received	$ (1,170)