Commitments and Contingencies - Insurance Proceeds Impact On Consolidated Condensed Statements Of Operation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Loss Contingencies [Line Items]
Cost of goods sold	$ 23,486	$ 25,402	$ 75,119	$ 72,889
Loss (gain) on insurance proceeds received	(3,304)	0	(4,468)	0
Net loss	(7,370)	$ (1,532)	(9,911)	$ (4,481)
Balance without insurance proceeds
Loss Contingencies [Line Items]
Cost of goods sold	24,560		77,789
Loss (gain) on insurance proceeds received	0		1,106
Net loss	(11,748)		(18,155)
Insurance recoveries
Loss Contingencies [Line Items]
Cost of goods sold	(1,074)		(2,670)
Loss (gain) on insurance proceeds received	(3,304)		(5,574)
Net loss	$ (4,378)		$ (8,244)