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Company Background - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2024 Location	Mar. 31, 2023	Mar. 31, 2024 Location	Mar. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2024 RetailDealership	Mar. 31, 2024 Marina
Concentration Risk [Line Items]
Number of retail locations	130		130					83	66
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					24.00%
Product Concentration Risk [Member] | Brunswick Sea Ray Boat [Member] | Brunswick [Member] | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats					11.00%
Product Concentration Risk [Member] | Brunswick Boston Whaler Boats [Member] | Brunswick [Member] | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats					11.00%
Product Concentration Risk [Member] | Azimut Benetti Groups and Yachts | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats					11.00%
Geographic Concentration Risk [Member] | Sales [Member] | Florida [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats					53.00%	51.00%	50.00%

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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