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Significant Accounting Policies - Summary of Revenue Disaggregated Into Categories Depict the Nature, Amount, Timing, and Uncertainty of Revenue and Cash Flows Affected by Economic Factor (Detail) - Product Concentration Risk [Member] - Sales [Member] | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 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%
Product Manufacturing [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 100.00% | 100.00% |
New Boat Sales [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 73.20% | 70.50% | 70.20%
New Boat Sales [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 71.90% | 70.30% | 70.20%
New Boat Sales [Member] | Product Manufacturing [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 100.00% | 100.00% |
Used Boat Sales [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 7.30% | 10.90% | 15.10%
Used Boat Sales [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 7.70% | 11.00% | 15.10%
Maintenance, Repair, Storage, Rental, and Charter Services [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 7.40% | 7.10% | 6.40%
Maintenance, Repair, Storage, Rental, and Charter Services [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 7.70% | 7.10% | 6.40%
Finance and Insurance Products [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 3.00% | 2.70% | 2.70%
Finance and Insurance Products [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 3.10% | 2.70% | 2.70%
Parts and Accessories [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 3.30% | 3.20% | 3.00%
Parts and Accessories [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 3.50% | 3.20% | 3.00%
Brokerage Sales [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 5.80% | 5.60% | 2.60%
Brokerage Sales [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 6.10% | 5.70% | 2.60%

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