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Notes Payable - Floor Plan (Details) - Inventory Financing Facility - USD ($)
12 Months Ended
Nov. 14, 2023
Sep. 30, 2023
Feb. 14, 2023
Sep. 30, 2022
Line of Credit Facility [Abstract]        
Maximum borrowing capacity     $ 550,000,000  
Outstanding balance of facility   $ 489,000,000   $ 267,100,000
Borrowing capacity   $ 61,000,000   $ 232,900,000
Subsequent Event        
Line of Credit Facility [Abstract]        
Maximum borrowing capacity $ 650,000,000      
New Inventory | Minimum        
Line of Credit Facility [Abstract]        
Credit facility, interest rate   8.18%   5.33%
New Inventory | Maximum        
Line of Credit Facility [Abstract]        
Credit facility, interest rate   10.43%   7.58%
Pre-owned Inventory | Minimum        
Line of Credit Facility [Abstract]        
Credit facility, interest rate   8.43%   5.58%
Pre-owned Inventory | Maximum        
Line of Credit Facility [Abstract]        
Credit facility, interest rate   10.68%   7.83%
Term SOFR        
Line of Credit Facility [Abstract]        
Debt instrument, term of variable rate   30 days    
Term SOFR | Subsequent Event        
Line of Credit Facility [Abstract]        
Debt instrument, term of variable rate 30 days      
Term SOFR | New Boats | Minimum        
Line of Credit Facility [Abstract]        
Debt instrument, variable interest rate   2.75%    
Term 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%