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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
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 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 | 63.60% | 69.90% | 62.70% | 67.40%
New Boat Sales [Member] | Retail Operations [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 63.20% | 69.50% | 62.30% | 67.20%
New Boat Sales [Member] | Product Manufacturing [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 98.40% | 98.40% | 98.70% | 98.70%
Used Boat Sales [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 12.20% | 8.90% | 12.50% | 9.40%
Used Boat Sales [Member] | Retail Operations [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 12.20% | 9.00% | 12.60% | 9.50%
Maintenance and Repair Services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 5.10% | 4.10% | 5.00% | 4.60%
Maintenance and Repair Services [Member] | Retail Operations [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 5.20% | 4.20% | 5.00% | 4.70%
Storage and Charter Rentals [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 6.40% | 5.60% | 7.50% | 6.90%
Storage and Charter Rentals [Member] | Retail Operations [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 6.70% | 5.70% | 7.80% | 6.90%
Finance and Insurance Products [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 3.60% | 3.00% | 3.40% | 2.90%
Finance and Insurance Products [Member] | Retail Operations [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 3.60% | 3.00% | 3.40% | 2.90%
Parts and Accessories [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 4.60% | 4.00% | 4.60% | 4.50%
Parts and Accessories [Member] | Retail Operations [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 4.60% | 4.00% | 4.60% | 4.50%
Parts and Accessories [Member] | Product Manufacturing [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 1.60% | 1.60% | 1.30% | 1.30%
Brokerage Sales [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 4.50% | 4.50% | 4.30% | 4.30%
Brokerage Sales [Member] | Retail Operations [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 4.50% | 4.60% | 4.30% | 4.30%

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