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Acquisitions, Walker Marine Group Acquisition (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Location
Sep. 30, 2021
USD ($)
Store
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Acquisition [Abstract]        
Number of stores | Store   70    
Payment of contingent consideration   $ 0 $ 1,456 $ 0
Summary of Assets Acquired and Liabilities Assumed [Abstract]        
Goodwill   $ 168,491 $ 113,059 $ 113,059
Walker Marine Group [Member]        
Acquisition [Abstract]        
Number of stores | Location 5      
Cash paid for acquisition $ 29,700      
Payment of contingent consideration 4,100      
Minimum payout due of contingent consideration 200      
Summary of Assets Acquired and Liabilities Assumed [Abstract]        
Accounts receivable 129      
Inventories 8,481      
Prepaid expenses 39      
Property and equipment 503      
Identifiable intangible assets 8,520      
Goodwill 26,927      
Accounts payable (213)      
Customer deposits (3,033)      
Notes payable - floor plan (7,563)      
Total purchase price $ 33,790