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Inventories - Summary of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Inventory [Line Items]    
Inventories, net $ 244,151 $ 228,041
New Boats, Motors, and Trailers [Member]
   
Inventory [Line Items]    
Inventories, gross 200,318 189,618
Used Boats, Motors, and Trailers [Member]
   
Inventory [Line Items]    
Inventories, gross 37,191 31,701
Parts, Accessories, and Other [Member]
   
Inventory [Line Items]    
Inventories, gross $ 6,642 $ 6,722