Accounts Receivable (Schedule Of Accounts Receivable Net Of Allowance For Doubtful Accounts) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, Total	$ 163,740	$ 160,580
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, Total	146,049	152,265
U.S. Government and prime contractors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, Total	$ 17,691	$ 8,315