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Short-Term Borrowings - Additional Information (Detail) - USD ($)
 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Oct. 31, 2015
Aug. 31, 2014
Line Of Credit Facility [Line Items]        
Additional borrowings $ 27,100,000      
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 $ 219,000,000      
Interest rate on short-term borrowings 3.90% 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     $ 260,000,000 $ 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