Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 146,341	$ 144,082
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	128,952	121,924
U.S. Government and prime contractors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 17,389	$ 22,158