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Revenue Recognition - Summary of Revenue Disaggregated Into Categories Depict the Nature, Amount, Timing, and Uncertainty of Revenue and Cash Flows Affected by Economic Factor (Details) - Sales [Member] - Product Concentration Risk [Member]	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	100.00%	100.00%	100.00%	100.00%
Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	100.00%	100.00%	100.00%	100.00%
Product Manufacturing [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	100.00%	100.00%	100.00%	100.00%
New Boat Sales [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	64.30%	65.00%	62.30%	65.70%
New Boat Sales [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	63.80%	64.80%	61.60%	65.40%
New Boat Sales [Member] | Product Manufacturing [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	98.90%	98.90%	98.90%	98.90%
Used Boat Sales [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	14.00%	11.60%	12.70%	9.80%
Used Boat Sales [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	14.10%	11.60%	12.80%	9.90%
Maintenance and Repair Services [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.90%	4.20%	4.90%	5.00%
Maintenance and Repair Services [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.90%	4.20%	5.00%	5.00%
Storage and Charter Rentals [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	7.40%	7.80%	8.10%	7.80%
Storage and Charter Rentals [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	7.80%	7.90%	8.50%	7.80%
Finance and Insurance Products [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.40%	3.20%	3.20%	2.80%
Finance and Insurance Products [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.40%	3.20%	3.30%	2.80%
Parts and Accessories [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.90%	4.60%	4.70%	4.80%
Parts and Accessories [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.90%	4.60%	4.70%	4.90%
Parts and Accessories [Member] | Product Manufacturing [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	1.10%	1.10%	1.10%	1.10%
Brokerage Sales [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.10%	3.60%	4.10%	4.10%
Brokerage Sales [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.10%	3.70%	4.10%	4.20%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
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- Definition

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