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Commitments and Contingencies - Insurance Receivable Balance Sheet Rollforward (Details) - Insurance recoveries
$ in Thousands
12 Months Ended
Sep. 30, 2019
USD ($)
Loss Contingencies [Line Items]  
Other receivable, beginning balance $ 0
Cash received (8,486)
Other expenses 2,463
Business interruption 1,168
Other receivable, ending balance 3,500
Equipment  
Loss Contingencies [Line Items]  
Capital expenditures (equipment) $ 8,355