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Short-Term Borrowings - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2012
Short-term Debt [Line Items] |  |  |
Maturity date | Jun. 30, 2013 |  |
Subject to additional extension for two one-year periods | Jun. 30, 2016 |  |
Credit Facility interest rate description |  | Interest rate for amounts outstanding under the CGI Facility is 350 basis points above the one month London Inter-Bank Offering Rate. |
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. |
Interest rate for amounts outstanding under the Amended Credit Facility |  | 3.50% |
Advances on new inventory mature date |  | 1081 days |
Advances on used inventory maturity period |  | 361 days |
Payment of used inventory |  | 6 months |
Payment of new inventory |  | 6 months |
Floor plan financing commitment |  | $ 30 |
CGI Facility advances outstanding period |  | 18 months |
Inventory and working capital needs |  | 122.5 | 120.6
Interest rate on short-term borrowings |  | 3.70% | 4.00%
Additional borrowings |  | 34.8 |
Long-term debt |  | 0 |
CGI Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Expiration date of CGI facility |  | 2013-08 |
Short-Term Debt [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Current amount of borrowing availability | 205 |  |
Previous amount of borrowing availability | $ 150 |  |
Credit Facility interest rate description |  | The interest rate for amounts outstanding under the Amended Credit Facility is now 355 basis points above the one-month London Inter-Bank Offering Rate ("LIBOR"). |
Reduction of basis points from the prior amendment |  | 0.28% |
Unused line fee on the unused portion of the amended Credit Facility |  | 0.10% |
Interest rate for amounts outstanding under the Amended Credit Facility |  | 3.55% |
Short-Term Debt [Member] | Maximum [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Leverage ratio |  | 2.75 |
Current ratio |  | 1.2 |
Short-Term Debt [Member] | Minimum [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Leverage ratio |  | 1.00 |
Current ratio |  | 1.0 |

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