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Goodwill Other Intangible Assets and Other Long Term Assets - Additional Information (Detail)
 12 Months Ended
Sep. 30, 2025
USD ($)
Segment
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Schedule Of Goodwill And Other Assets [Line Items]      
Accounts receivable, net $ 108,288,000 $ 106,409,000  
Inventories 867,328,000 906,641,000  
Short-term borrowings (Floor Plan) 715,679,000 708,994,000  
Accrued expenses 121,042,000 197,295,000  
Accounts payable $ 56,378,000 54,481,000  
Weighted average amortization period 4 years    
Contract liabilities $ 45,699,000 64,845,000  
Goodwill 526,931,000 592,293,000 $ 559,820,000
Other identifiable intangibles 35,416,000 37,458,000  
Revenue 2,309,288,000 2,431,008,000 2,394,706,000
Income (Loss) before taxes (37,141,000) 54,331,000 147,435,000
Other intangible assets, net 35,416,000 37,458,000  
Goodwill and other intangible assets decreased, due to impairments 67,400,000    
Goodwill and other intangible assets increased from acquisitions   30,200,000  
Goodwill expected to be deductible for tax purposes   700,000  
Non-cash, pre-tax goodwill impairment charge $ 69,055,000    
Number of reportable segments | Segment 2    
Other long-term assets $ 36,751,000 32,741,000  
Product Manufacturing [Member]      
Schedule Of Goodwill And Other Assets [Line Items]      
Goodwill 0 69,055,000 69,055,000
Non-cash, pre-tax goodwill impairment charge 69,055,000    
Product Manufacturing [Member] | Operating Segments [Member]      
Schedule Of Goodwill And Other Assets [Line Items]      
Goodwill 0    
Revenue 138,947,000 $ 154,753,000 $ 222,289,000
Non-cash, pre-tax goodwill impairment charge 69,055,000    
Retail Operations Reportable Segment [Member]      
Schedule Of Goodwill And Other Assets [Line Items]      
Non-cash, pre-tax goodwill impairment charge $ 0