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Company Background - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2025 Location	Mar. 31, 2024	Mar. 31, 2025 Location	Mar. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2025 RetailDealership	Mar. 31, 2025 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					20.00%
Product Concentration Risk [Member] | Brunswick Sea Ray Boat [Member] | Brunswick [Member] | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats					9.00%
Product Concentration Risk [Member] | Brunswick Boston Whaler Boats [Member] | Brunswick [Member] | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats					9.00%
Product Concentration Risk [Member] | Azimut Benetti Groups and Yachts | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats					8.00%
Geographic Concentration Risk [Member] | Sales [Member] | Florida [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats					53.00%	53.00%	51.00%

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