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Supporting Financial Information - Long-term Debt (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2017
Sep. 30, 2016
Debt Instrument [Line Items]    
Document Fiscal Year Focus 2017  
Long-term Debt $ 21,563  
Long-term Debt, Excluding Current Maturities 17,096  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 3,750  
Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 21,563 $ 23,438
Unamortized Debt Issuance Expense 1,095 1,222
Long-term Debt 20,468 22,216
Long-term Debt, Current Maturities (3,580) (3,560)
Long-term Debt, Excluding Current Maturities 16,888 $ 18,656
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 3,750  
Long-term Debt, Maturities, Repayments of Principal in Year Two 3,750  
Long-term Debt, Maturities, Repayments of Principal in Year Three 3,750  
Long-term Debt, Maturities, Repayments of Principal in Year Four 3,750  
Long-term Debt, Maturities, Repayments of Principal in Year Five $ 6,563