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Short-Term Borrowings - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Oct. 31, 2015 | Jun. 30, 2013
Line Of Credit Facility [Line Items] |  |  |  |
Additional borrowings | $ 54,500,000 |  |  |
Long-term debt | $ 0 |  |  |
Minimum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Current ratio | 120.00% |  |  |
Borrowing Base Amount and Aging Inventory [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Inventory and working capital needs | $ 137,200,000 | $ 124,400,000 |  |
Interest rate on short-term borrowings | 3.60% | 3.60% |  |
Amended Credit Facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Subject to additional extension for two one-year periods | Oct. 31, 2018 |  |  |
Interest rate for amounts outstanding under the Amended Credit Facility | 3.45% |  |  |
Amended Credit Facility [Member] | Borrowing Base Amount and Aging Inventory [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Amount of borrowing availability |  |  |  | $ 235,000,000
Line of Credit Facility, Description | The October 2015 amendment extended the maturity date of the Credit Facility to October 2018, subject to additional extension for two one-year periods, with lender approval. |  |  |
Leverage ratio | 275.00% |  |  |
Credit Facility interest rate description | The interest rate for amounts outstanding under the Amended Credit Facility is 345 basis points above the one-month London Inter-Bank Offering Rate (“LIBOR”). |  |  |
Debt instrument, covenant compliance | The covenants include provisions that our leverage ratio must not exceed 2.75 to 1.0 and that our current ratio must be greater than 1.2 to 1.0. |  |  |
Unused line fee on the unused portion of the amended Credit Facility | 0.10% |  |  |
Advances on new inventory mature date | 1080 days |  |  |
Advances on used inventory maturity period | 361 days |  |  |
Advance is subject to a curtailment schedule, periodic basis | 6 months |  |  |
Real estate property pledged for collateral | $ 0 |  |  |
Amended Credit Facility [Member] | Borrowing Base Amount and Aging Inventory [Member] | Subsequent Event [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Amount of borrowing availability |  |  | $ 260,000,000 |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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