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Receivables, net (Allowance for Uncollectible Accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance at Beginning of Period $ 579 $ 951 $ 1,820
Additions to Bad Debt Expense 1,511 827 1,153
Write-offs of Uncollectible Accounts (1,091) (1,199) (2,022)
Balance at End of Period 999 579 951
Trade Accounts Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Additions to Bad Debt Expense $ 1,511 $ 827 $ 1,153