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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
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 | 70.80% | 73.50% | 69.90% | 73.50%
New Boat Sales [Member] | Retail Operations [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 69.30% | 72.30% | 68.50% | 72.30%
New Boat Sales [Member] | Product Manufacturing [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 93.10% | 94.80% | 95.60% | 96.20%
Used Boat Sales [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 7.70% | 7.60% | 6.60% | 7.50%
Used Boat Sales [Member] | Retail Operations [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 8.10% | 8.00% | 7.00% | 7.90%
Used Boat Sales [Member] | Product Manufacturing [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 5.30% | 3.70% | 3.10% | 2.70%
Maintenance, Repair, Storage, Rental, and Charter Services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 9.90% | 6.90% | 11.50% | 7.30%
Maintenance, Repair, Storage, Rental, and Charter Services [Member] | Retail Operations [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 10.40% | 7.20% | 12.00% | 7.60%
Finance and Insurance Products [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 2.80% | 3.10% | 2.80% | 3.00%
Finance and Insurance Products [Member] | Retail Operations [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 2.90% | 3.20% | 2.90% | 3.10%
Parts and Accessories [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 4.20% | 3.60% | 4.80% | 3.10%
Parts and Accessories [Member] | Retail Operations [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 4.50% | 3.80% | 5.00% | 3.30%
Parts and Accessories [Member] | Product Manufacturing [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 0.90% | 0.80% | 0.60% | 0.70%
Brokerage Sales [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 4.60% | 5.30% | 4.40% | 5.60%
Brokerage Sales [Member] | Retail Operations [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 4.80% | 5.50% | 4.60% | 5.80%
Brokerage Sales [Member] | Product Manufacturing [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sales Revenue Goods And Services Net Percentage | 0.70% | 0.70% | 0.70% | 0.40%

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