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Revenue Recognition - Accounts Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Accounts receivable        
Billed $ 109,604 $ 109,604   $ 161,473
Allowance for doubtful accounts (1,450) (1,450)   (1,498)
Accounts receivable - net 108,154 108,154   159,975
Trade receivables sold to a financial institution   0   18,400
Receipt of withheld proceeds from sale of trade receivables 641 2,483 $ 5,521  
U.S. federal government contracts        
Accounts receivable        
Amounts billed $ 21,800 $ 21,800   $ 82,200