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Commitments and Contingencies - Insurance Receivable Balance Sheet Rollforward (Details)
$ in Thousands
6 Months Ended
Mar. 31, 2020
USD ($)
Loss Contingencies [Line Items]  
Business interruption $ 915
Quality Aluminum Forge, LLC Manufacturing Facility Fire  
Loss Contingencies [Line Items]  
Other receivable, beginning balance 3,500
Cash proceeds (6,787)
Other expenses 1,372
Business interruption 915
Other receivable, ending balance 0
Quality Aluminum Forge, LLC Manufacturing Facility Fire | Equipment  
Loss Contingencies [Line Items]  
Capital expenditures $ 1,000