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Commitments and Contingencies - Narratives (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Loss contingency    
Accrued liability for the outcomes of non-income based tax audits $ 4,500 $ 2,500
Indemnification liability 2,600 2,800
Loss Contingencies    
Benefit from tax audit 11,300  
Tax refund receivable 15,262 $ 0
Accrued liabilities    
Loss Contingencies    
Accrued income taxes 4,000  
Cost of sales excluding depreciation and amortization    
Loss Contingencies    
Benefit from tax audit 1,800  
SG&A    
Loss Contingencies    
Benefit from tax audit 8,900  
Interest expense    
Loss Contingencies    
Benefit from tax audit 100  
Other income    
Loss Contingencies    
Benefit from tax audit $ 500