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Debt (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2017
Sep. 30, 2016
Debt [Abstract]    
Long-term Debt, Excluding Current Maturities $ 29,407 $ 29,257
Revolving Credit Facility [Member]    
Line Of Credit Facility [Line Items]    
Line Of Credit Facility Interest Rate At Period End 3.04% 2.76%
Letters of Credit Outstanding, Amount $ 6,493  
Excess Availability 43,821  
Maximum Revolver Amount $ 100,000  
Credit Facility Expiration Date Aug. 09, 2021  
Credit Facility Covenant Terms new covenant that requires the Company to maintain a minimum EBITDA (as defined in the Amended Credit Agreement) that will be tested quarterly on a trailing twelve month basis; increasing the minimum liquidity requirement applicable to the Company from 12.5% to 30% of the maximum revolver amount; raising the Company’s required fixed charge coverage ratio (the “FCCR”) to 1.1:1.0 from 1.0:1.0; and requiring that the FCCR be tested quarterly regardless of the Company’s liquidity levels.