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Debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Debt [Abstract]      
Interest expense $ 1,946 $ 1,702 $ 1,282
Line Of Credit Facility [Line Items]      
Letters of Credit Outstanding, Amount 6,609    
Maximum Revolver Amount $ 100,000    
Line Of Credit Facility Covenant Terms • a Fixed Charge Coverage Ratio (as defined in the Amended Credit Agreement), measured quarterly on a trailing four-quarter basis at the end of each quarter, of at least 1.1 to 1.0; and • minimum Liquidity (as defined in the Amended Credit Agreement) of at least thirty percent (30%) of the Maximum Revolver Amount (as defined in the Amended Credit Agreement), or $30,000; with, for purposes of this covenant, at least fifty percent (50%) of our Liquidity comprised of Excess Availability (as defined in the Amended Credit Agreement).    
Weighted Average Annual Interest Rate 3.86% 3.04%  
Revolving Loan [Member]      
Line Of Credit Facility [Line Items]      
Excess Availability $ 48,144    
Line Of Credit Facility, Expiration Date Aug. 09, 2021    
Liquidity $ 74,391    
EBITDA $ 36,964