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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