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Notes Payable - Floor Plan (Details) - Inventory Financing Facility [Member] - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Dec. 29, 2021
Line of Credit Facility [Abstract]      
Maximum borrowing capacity     $ 500.0
Outstanding balance of facility $ 425.4 $ 267.1  
Credit facility, available borrowing capacity $ 74.6 $ 232.9  
New Inventory [Member] | Minimum [Member]      
Line of Credit Facility [Abstract]      
Credit facility, interest rate 6.93% 5.33%  
New Inventory [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Credit facility, interest rate 9.18% 7.58%  
Pre-owned Inventory [Member] | Minimum [Member]      
Line of Credit Facility [Abstract]      
Credit facility, interest rate 7.18% 5.58%  
Pre-owned Inventory [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Credit facility, interest rate 9.43% 7.83%  
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%