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Short-Term Borrowings - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Short-term Debt [Line Items]    
Subject to additional extension for two one-year periods Jun. 30, 2016  
Line of Credit Facility, Description The June 2013 amendment extended the maturity date of the Credit Facility to June 2016, subject to additional extension for two one-year periods, with lender approval.  
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.  
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  
Inventory and working capital needs $ 125.9  
Interest rate on short-term borrowings 3.60% 4.00%
Additional borrowings 35.1  
Long-term debt 0  
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