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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, 2021 | Sep. 30, 2020 | Sep. 30, 2019
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% |  |
New Boat Sales [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 70.50% | 70.20% | 70.10%
New Boat Sales [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 70.30% | 70.20% | 70.10%
New Boat Sales [Member] | Product Manufacturing [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 100.00% |  |
Used Boat Sales [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 10.90% | 15.10% | 14.90%
Used Boat Sales [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 11.00% | 15.10% | 14.90%
Maintenance, Repair, Storage and Charter Services [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 7.10% | 6.40% | 6.90%
Maintenance, Repair, Storage and Charter Services [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 7.10% | 6.40% | 6.90%
Finance and Insurance Products [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 2.70% | 2.70% | 2.60%
Finance and Insurance Products [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 2.70% | 2.70% | 2.60%
Parts and Accessories [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 3.20% | 3.00% | 3.60%
Parts and Accessories [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 3.20% | 3.00% | 3.60%
Brokerage Sales [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 5.60% | 2.60% | 1.90%
Brokerage Sales [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 5.70% | 2.60% | 1.90%

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