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Notes Payable - Floor Plan (Details) - Inventory Financing Facility - USD ($)
12 Months Ended
Sep. 30, 2024
Nov. 13, 2024
Sep. 30, 2023
Feb. 14, 2023
Line of Credit Facility [Abstract]        
Maximum borrowing capacity       $ 650,000,000.0
Outstanding balance of facility $ 443,400,000   $ 489,000,000.0  
Debt instrument, term of variable rate 30 days      
Borrowing capacity $ 206,600,000   $ 61,000,000.0  
Subsequent Event        
Line of Credit Facility [Abstract]        
Maximum borrowing capacity   $ 595,000,000    
New Inventory | Minimum        
Line of Credit Facility [Abstract]        
Credit facility, interest rate 8.03%   8.18%  
New Inventory | Maximum        
Line of Credit Facility [Abstract]        
Credit facility, interest rate 10.28%   10.43%  
Pre-owned Inventory | Minimum        
Line of Credit Facility [Abstract]        
Credit facility, interest rate 8.28%   8.43%  
Pre-owned Inventory | Maximum        
Line of Credit Facility [Abstract]        
Credit facility, interest rate 10.53%   10.68%  
SOFR | New Boats | Minimum        
Line of Credit Facility [Abstract]        
Debt instrument, variable interest rate 2.75%      
SOFR | New Boats | Maximum        
Line of Credit Facility [Abstract]        
Debt instrument, variable interest rate 5.00%      
Boat Rate | New Boats        
Line of Credit Facility [Abstract]        
Debt instrument, variable interest rate 0.25%      
Wells Fargo        
Line of Credit Facility [Abstract]        
Percentage of finance provided of vendor invoice price 100.00%