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Debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Debt [Abstract]      
Interest expense $ 1,282 $ 1,130 $ 1,574
Letters of Credit Outstanding $ 6,944    
Revolving Loan [Member]      
Line Of Credit Facility [Line Items]      
Line of Credit Facility, Description We maintain a revolving credit facility with Wells Fargo Bank, N.A. (the “Credit Facility”), which is evidenced by an Amended and Restated Credit and Security Agreement (as amended, the “Credit Agreement”). During fiscal 2016, we amended the maximum revolver amount under the Credit Facility from $60,000 to $70,000 and extended the maturity date by one year to August 9, 2019. In addition, as further described below, we amended the Credit Facility to reduce the interest rate charged, modify the calculation of amounts available, resulting in an increase in available borrowing capacity, create new minimum thresholds for Liquidity and Excess Availability (as defined in the Credit Agreement), and modify the thresholds of Liquidity (which, as defined in the Credit Agreement, is the aggregate amount of unrestricted cash and cash equivalents on hand plus Excess Availability) and Excess Availability below which the Company must maintain a specified Fixed Charge Coverage Ratio (as defined in the Credit Agreement).    
Line Of Credit Facility, Expiration Date Aug. 09, 2019    
Line of Credit Facility, Maximum Borrowing Capacity $ 70,000    
Line Of Credit Facility Covenant Terms at any time that our Liquidity is less than $14,000 or our Excess Availability is less than $7,000, that we maintain a Fixed Charge Coverage Ratio of not less than 1.0:1.0    
Line of Credit Facility, Interest Rate Description amounts outstanding bear interest at a per annum rate equal to a Daily Three Month LIBOR (as defined in the Credit Agreement), plus an interest rate margin, which is determined quarterly    
Liquidity $ 66,291    
Excess Availability $ 33,070    
Unused commitment fee 0.375%    
Line Of Credit Facility Collateral Fees a collateral monitoring fee ranging from $1 to $2, based on the then-applicable interest rate margin