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Debt (Details) - USD ($) $ in Thousands | 12 Months Ended
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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 |  |

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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Description of the conditions for borrowing under the credit facility including the nature of any restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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