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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		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
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	69.90%	70.90%	67.40%	70.00%
New Boat Sales [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	69.50%	69.30%	67.20%	68.40%
New Boat Sales [Member] | Product Manufacturing [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	98.40%	93.10%	98.70%	95.60%
Used Boat Sales [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	8.90%	7.70%	9.40%	6.60%
Used Boat Sales [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	9.00%	8.10%	9.50%	7.00%
Used Boat Sales [Member] | Product Manufacturing [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage		5.30%		3.10%
Maintenance and Repair Services [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	4.10%	4.40%	4.60%	4.70%
Maintenance and Repair Services [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	4.20%	4.70%	4.70%	5.00%
Storage and Charter Rentals [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	5.60%	5.40%	6.90%	6.70%
Storage and Charter Rentals [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	5.70%	5.70%	6.90%	7.10%
Finance and Insurance Products [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.00%	2.80%	2.90%	2.80%
Finance and Insurance Products [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	3.00%	2.90%	2.90%	2.90%
Parts and Accessories [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	4.00%	4.20%	4.50%	4.80%
Parts and Accessories [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	4.00%	4.50%	4.50%	5.00%
Parts and Accessories [Member] | Product Manufacturing [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	1.60%	0.90%	1.30%	0.60%
Brokerage Sales [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	4.50%	4.60%	4.30%	4.40%
Brokerage Sales [Member] | Retail Operations [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage	4.60%	4.80%	4.30%	4.60%
Brokerage Sales [Member] | Product Manufacturing [Member]
Product Information [Line Items]
Sales Revenue Goods And Services Net Percentage		0.70%		0.70%

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.

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