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Accounts Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Accounts Receivable |  |
Accounts receivable, Total | $ 144,082 | $ 158,715
Commercial |  |
Accounts Receivable |  |
Accounts receivable, Total | 121,924 | 137,553
U.S. Government and prime contractors |  |
Accounts Receivable |  |
Accounts receivable, Total | $ 22,158 | $ 21,162

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