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Notes Payable - Floor Plan (Details) - Inventory Financing Facility - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2023
Feb. 14, 2023
Sep. 30, 2022
Line of Credit Facility [Abstract]      
Maximum borrowing capacity   $ 550.0  
Outstanding balance of facility $ 444.8   $ 267.1
Line of credit facility, remaining borrowing capacity $ 105.2   $ 232.9
Minimum | New Inventory      
Line of Credit Facility [Abstract]      
Credit facility, interest rate 7.93%   5.33%
Minimum | Pre-owned Inventory      
Line of Credit Facility [Abstract]      
Credit facility, interest rate 8.18%   5.58%
Maximum | New Inventory      
Line of Credit Facility [Abstract]      
Credit facility, interest rate 10.18%   7.58%
Maximum | Pre-owned Inventory      
Line of Credit Facility [Abstract]      
Credit facility, interest rate 10.43%   7.83%
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 | New Boats      
Line of Credit Facility [Abstract]      
Debt instrument, variable interest rate 0.25%