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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
May 06, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Oct. 01, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Proceeds From Pay Check Program   $ 6,488      
Net operating lease right-of-use assets   14,566     $ 4,800
Operating lease liabilities   14,727      
Additional operating lease right use of assets   10,800      
Additional operating right use of liabilities   $ 10,800      
Paycheck Protection Program          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Proceeds From Pay Check Program $ 6,500        
Restatement          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Net operating lease right-of-use assets         4,800
Restatement | ASU 2016-02          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Net operating lease right-of-use assets         4,800
Operating lease liabilities         $ 4,800
Revenue From Products And Services Transferred Over Time Risk | Revenue Benchmark          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Revenue from products and services transferred over time, as percentage of overall revenue (percentage)   100.00% 100.00% 100.00%  
Transferred over time | Revenue From Products And Services Transferred Over Time Risk | Revenue Benchmark          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Revenue from products and services transferred over time, as percentage of overall revenue (percentage)   5.00% 4.00% 1.00%