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Leases - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2020
Oct. 01, 2019
Lessee, Lease, Description [Line Items]    
Cash paid for amounts included in operating lease liabilities $ 2,506  
Cash paid for amounts included in finance lease liabilities 17  
Non-cash: lease liabilities arising from new operating lease assets obtained 12,188  
Non-cash: lease liabilities arising from new finance lease assets obtained 10  
Non-cash: adjustments to lease assets and liabilities 1,675  
Total lease liabilities $ 11,174  
ASU 2016-02    
Lessee, Lease, Description [Line Items]    
Total lease liabilities   $ 12,200