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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Leases, Operating [Abstract]      
Deferred rent charges included in other long-term liabilities $ 400 $ 600  
Rent expense 5,900 $ 10,700 $ 10,800
Operating Lease Payments      
2020 5,572    
2021 3,551    
2022 2,279    
2023 1,500    
2024 545    
Total future minimum lease payments 13,447    
Capital Lease Payments      
2020 52    
2021 53    
2022 53    
2023 54    
2024 160    
Total future minimum lease payments 372    
Total      
2020 5,624    
2021 3,604    
2022 2,332    
2023 1,554    
2024 705    
Total future minimum lease payments 13,819    
Tax liability accrued $ 600