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Notes Payable - Floor Plan (Details) - Inventory Financing Facility [Member] - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Dec. 29, 2021
Sep. 30, 2021
Line of Credit Facility [Abstract]      
Maximum borrowing capacity   $ 500.0  
Outstanding balance of facility $ 267.1   $ 114.2
Credit facility, available borrowing capacity $ 232.9   $ 278.3
New Inventory [Member] | Minimum [Member]      
Line of Credit Facility [Abstract]      
Credit facility, interest rate 5.33%   3.08%
New Inventory [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Credit facility, interest rate 7.58%   5.33%
Pre-owned Inventory [Member] | Minimum [Member]      
Line of Credit Facility [Abstract]      
Credit facility, interest rate 5.58%   3.33%
Pre-owned Inventory [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Credit facility, interest rate 7.83%   5.58%
SOFR [Member]      
Line of Credit Facility [Abstract]      
Debt instrument, term of variable rate 30 days    
SOFR [Member] | New Boats [Member] | Minimum [Member]      
Line of Credit Facility [Abstract]      
Debt instrument, variable interest rate 2.75%    
SOFR [Member] | New Boats [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Debt instrument, variable interest rate 5.00%    
Boat Rate [Member] | New Boats [Member]      
Line of Credit Facility [Abstract]      
Debt instrument, variable interest rate 0.25%    
Wells Fargo [Member]      
Line of Credit Facility [Abstract]      
Percentage of finance provided of vendor invoice price 100.00%