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Supporting Financial Information - Long-term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Debt Instrument [Line Items]    
Document Fiscal Year Focus 2017  
Long-term Debt $ 22,500  
Long-term Debt, Excluding Current Maturities 17,768  
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 22,500 $ 23,438
Unamortized Debt Issuance Expense 1,162 1,222
Long-term Debt 21,338 22,216
Long-term Debt, Current Maturities (3,570) (3,560)
Long-term Debt, Excluding Current Maturities 17,768 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 7,500  
Line of Credit    
Debt Instrument [Line Items]    
Long-term Debt 0  
Term Loans | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 22,500 $ 23,438