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Short-Term Borrowings - Additional Information (Detail) - USD ($)
 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Aug. 31, 2014
Jun. 30, 2013
Short Term Debt [Line Items]        
Line of Credit Facility, Description The August 2014 amendment extended the maturity date of the Credit Facility to August 2017, subject to additional extension for two one-year periods, with lender approval.      
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      
Additional borrowings $ 30,900,000      
Long-term debt $ 0      
Maximum [Member]        
Short Term Debt [Line Items]        
Leverage ratio 275.00%      
Minimum        
Short Term Debt [Line Items]        
Leverage ratio 100.00%      
Current ratio 120.00%      
Borrowing Base Amount and Aging Inventory [Member]        
Short Term Debt [Line Items]        
Inventory and working capital needs $ 137,400,000      
Interest rate on short-term borrowings 3.60% 3.60%    
Amended Credit Facility [Member]        
Short Term Debt [Line Items]        
Subject to additional extension for two one-year periods Aug. 31, 2017      
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      
Interest rate for amounts outstanding under the Amended Credit Facility 3.45%      
Unused line fee on the unused portion of the amended Credit Facility 0.10%      
Amended Credit Facility [Member] | Borrowing Base Amount and Aging Inventory [Member]        
Short Term Debt [Line Items]        
Amount of borrowing availability     $ 235,000,000 $ 205,000,000