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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%

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