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Inventories
 6 Months Ended
Mar. 31, 2024
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following at:
($ in thousands)March 31, 2024September 30, 2023
New vessels$536,126 $471,147 
Pre-owned vessels78,425 61,627 
Work in process, parts and accessories72,926 76,842 
Total inventories, net$687,477 $609,616