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Short-Term Borrowings - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Oct. 31, 2018
May 31, 2017
Line Of Credit Facility [Line Items]        
Additional borrowings $ 71,600,000      
Long-term debt $ 0      
Minimum [Member]        
Line Of Credit Facility [Line Items]        
Current ratio 1.20%      
Borrowing Base Amount and Aging Inventory [Member]        
Line Of Credit Facility [Line Items]        
Inventory and working capital needs $ 212,900,000 $ 254,200,000    
Interest rate on short-term borrowings 5.50% 4.70%    
Amended Credit Facility [Member]        
Line Of Credit Facility [Line Items]        
Additional extension for two one-year periods Oct. 31, 2021      
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       $ 350,000,000
Line of Credit Facility, Description The October 2018 amendment and restatement extended the maturity date of the Credit Facility to October 2021, and the Amended Credit Facility includes two additional one-year extension periods, with lender approval.      
Leverage ratio 2.75%      
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      
Amended Credit Facility [Member] | Borrowing Base Amount and Aging Inventory [Member] | Subsequent Event [Member]        
Line Of Credit Facility [Line Items]        
Amount of borrowing availability     $ 400,000,000