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Short-Term Borrowings and Long-Term Debt - Additional Information (Detail) - USD ($)
 1 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2022
Jul. 31, 2021
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Line Of Credit Facility [Line Items]          
Additional borrowings       $ 800,000  
Unamortized debt issuance costs     $ 100,000 100,000 $ 200,000
Long-term debt, net of current maturities     $ 45,301,000 45,301,000 47,498,000
Interest rate on floor plan facility     3.45%    
Long-term debt     $ 48,693,000 $ 48,693,000  
Mortgage Facility [Member]          
Line Of Credit Facility [Line Items]          
Debt instrument interest rate     2.20% 2.20%  
Long-term debt     $ 48,693,000 $ 48,693,000 51,680,000
Borrowing Base Amount and Aging Inventory [Member]          
Line Of Credit Facility [Line Items]          
Inventory and working capital needs     $ 100,000 $ 100,000 $ 24,100,000
Interest rate on short-term borrowings       6.00% 4.20%
Revolving Credit Facility [Member] | Minimum [Member]          
Line Of Credit Facility [Line Items]          
Debt instrument interest rate     1.50% 1.50%  
Revolving Credit Facility [Member] | Maximum [Member]          
Line Of Credit Facility [Line Items]          
Debt instrument interest rate     2.00% 2.00%  
Term Loan Facility | Minimum [Member]          
Line Of Credit Facility [Line Items]          
Debt instrument interest rate     1.50% 1.50%  
Term Loan Facility | Maximum [Member]          
Line Of Credit Facility [Line Items]          
Debt instrument interest rate     2.00% 2.00%  
Credit Facility [Member]          
Line Of Credit Facility [Line Items]          
Line of credit facility, term   1 year      
Line of Credit Facility, Description       we amended the Credit Facility to increase the borrowing availability to $500 million, extend the term to expire by one year to July 2024, with two one-year options to renew, subject to lender approval, and modify certain provisions to provide additional liquidity to the Company.  
Additional extension for two one-year periods   Jul. 31, 2024   Jul. 31, 2024  
Credit Facility [Member] | Borrowing Base Amount and Aging Inventory [Member]          
Line Of Credit Facility [Line Items]          
Amount of borrowing availability   $ 500,000,000      
Line of Credit Facility, Description       The Credit Facility was set to expire in July 2024, subject to extension for two one-year periods, with lender approval.  
New Credit Agreement [Member]          
Line Of Credit Facility [Line Items]          
Amount of borrowing availability $ 750,000,000        
Leverage ratio     3.35% 3.35%  
Debt instrument, covenant compliance       The covenants include provisions that our leverage ratio must not exceed 3.35 to 1.0 and that our consolidated fixed charge coverage ratio must be greater than 1.10 to 1.0. As of September 30, 2022, we were in compliance with all covenants under the New Credit Agreement. The New Credit Agreement is secured by the Company’s personal property assets, including inventory and related accounts receivable. The mortgage loans will also be secured by the real estate pledged as collateral for such loans.  
Credit facility interest rate description       The interest rate is (a) for amounts outstanding under the floor plan facility, 3.45% above the one month secured term rate as administered by the CME Group Benchmark Administration Limited (CBA) (“SOFR”), (b) for amounts outstanding under the revolving credit facility or the term loan facility, a range of 1.50% to 2.0%, depending on the total net leverage ratio, above the one month, three month, or six month term SOFR rate, and (c) for amounts outstanding under the mortgage loan facility, 2.20% above the one month, three month, or six month term SOFR rate. The alternate base rate with a margin is available for amounts outstanding under the revolving credit, term, and mortgage loan facilities and the Euro Interbank Offered Rate plus a margin is available for borrowings in Euro or other currencies other than dollars under the revolving credit facility.  
New Credit Agreement [Member] | Delayed Draw Term Loan Facility          
Line Of Credit Facility [Line Items]          
Long Term Debt Maturity 2027-08        
New Credit Agreement [Member] | Delayed Draw Mortgage Loan Facility [Member]          
Line Of Credit Facility [Line Items]          
Long Term Debt Maturity 2027-08        
Long-term debt $ 100,000,000        
New Credit Agreement [Member] | Maximum [Member]          
Line Of Credit Facility [Line Items]          
Fixed coverage ratio     110    
New Credit Agreement [Member] | Maximum [Member] | Delayed Draw Term Loan Facility          
Line Of Credit Facility [Line Items]          
Long-term debt 400,000,000        
New Credit Agreement [Member] | Revolving Credit Facility [Member]          
Line Of Credit Facility [Line Items]          
Amount of borrowing availability 100,000,000        
Swingline facility 20,000,000        
Letter of credit sublimit amount $ 20,000,000