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Revenue from Contracts with Customers - Contract Balances - Receivables (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]      
Billed Receivables $ 198,305 $ 211,776  
Unbilled Receivables 155,408 181,550  
Receivables Gross 353,713 393,326  
Allowance for doubtful accounts (4,154) (5,072) $ (2,568)
Net receivables 349,559 388,254  
Accounts Receivable, net , noncurrent (37,452) (54,074)  
Accounts receivable, net 312,107 334,180  
Expense, Allowance for Credit Loss 652 3,199  
Write-off $ (1,570) $ (695)