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Notes Payable - Floor Plan (Details) - Inventory Financing Facility - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2025
Nov. 13, 2024
Sep. 30, 2024
Nov. 14, 2023
Line of Credit Facility [Abstract]        
Maximum borrowing capacity   $ 595.0   $ 650.0
Outstanding balance of facility $ 435.8   $ 443.4  
Line of credit facility, remaining borrowing capacity $ 159.2   $ 206.6  
Minimum | New Inventory        
Line of Credit Facility [Abstract]        
Credit facility, interest rate 7.18%   8.03%  
Minimum | Pre-owned Inventory        
Line of Credit Facility [Abstract]        
Credit facility, interest rate 7.43%   8.28%  
Maximum | New Inventory        
Line of Credit Facility [Abstract]        
Credit facility, interest rate 9.43%   10.28%  
Maximum | Pre-owned Inventory        
Line of Credit Facility [Abstract]        
Credit facility, interest rate 9.68%   10.53%  
Wells Fargo        
Line of Credit Facility [Abstract]        
Percentage of finance provided of vendor invoice price 100.00%      
SOFR        
Line of Credit Facility [Abstract]        
Debt instrument, term of variable rate 30 days      
SOFR | Minimum | New Boats        
Line of Credit Facility [Abstract]        
Debt instrument, variable interest rate 2.75%      
SOFR | Maximum | New Boats        
Line of Credit Facility [Abstract]        
Debt instrument, variable interest rate 5.00%      
Boat Rate | Pre-owned Inventory        
Line of Credit Facility [Abstract]        
Debt instrument, variable interest rate 0.25%