v3.26.1
Company Background - Additional Information (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2026
Location
Mar. 31, 2025
Mar. 31, 2026
Location
Mar. 31, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Mar. 31, 2026
RetailDealership
Mar. 31, 2026
Marina
Concentration Risk [Line Items]                  
Number of retail locations 120   120         70 65
Product Concentration Risk [Member] | Sales [Member]                  
Concentration Risk [Line Items]                  
Revenue percentage from sale of boats 100.00% 100.00% 100.00% 100.00%          
Product Concentration Risk [Member] | Brunswick [Member] | Sales [Member]                  
Concentration Risk [Line Items]                  
Revenue percentage from sale of boats         18.00%        
Product Concentration Risk [Member] | Brunswick Sea Ray Boat [Member] | Brunswick [Member] | Sales [Member]                  
Concentration Risk [Line Items]                  
Revenue percentage from sale of boats         54.00%        
Product Concentration Risk [Member] | Brunswick Boston Whaler Boats [Member] | Brunswick [Member] | Sales [Member]                  
Concentration Risk [Line Items]                  
Revenue percentage from sale of boats         8.00%        
Product Concentration Risk [Member] | Azimut Benetti Groups and Yachts | Sales [Member]                  
Concentration Risk [Line Items]                  
Revenue percentage from sale of boats         9.00%        
Geographic Concentration Risk [Member] | Sales [Member] | Florida [Member]                  
Concentration Risk [Line Items]                  
Revenue percentage from sale of boats         6.00% 53.00% 53.00%