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Supporting Financial Information - Long-term Debt (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2017
Sep. 30, 2016
Debt Instrument [Line Items]    
Document Fiscal Year Focus 2017  
Long-term Debt $ 20,625  
Long-term Debt, Excluding Current Maturities 16,215  
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 20,625 $ 23,438
Unamortized Debt Issuance Expense 1,028 1,222
Long-term Debt 19,597 22,216
Long-term Debt, Current Maturities (3,590) (3,560)
Long-term Debt, Excluding Current Maturities 16,007 $ 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 $ 5,625