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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, 2023 | Sep. 30, 2022 | Sep. 30, 2021
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% | 100.00%
New Boat Sales [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 68.70% | 73.20% | 70.50%
New Boat Sales [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 67.30% | 71.90% | 70.30%
New Boat Sales [Member] | Product Manufacturing [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 95.80% | 95.00% | 98.80%
Used Boat Sales [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 7.90% | 7.30% | 10.90%
Used Boat Sales [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 8.30% | 7.70% | 11.00%
Used Boat Sales [Member] | Product Manufacturing [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 2.80% | 3.80% |
Maintenance and Repair Services [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 4.40% | 4.10% | 4.10%
Maintenance and Repair Services [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 4.60% | 4.70% | 4.10%
Storage and Charter Rentals [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 6.70% | 3.30% | 3.00%
Storage and Charter Rentals [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 7.10% | 3.00% | 3.00%
Finance and Insurance Products [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 2.80% | 3.00% | 2.70%
Finance and Insurance Products [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 2.90% | 3.10% | 2.70%
Parts and Accessories [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 4.70% | 3.30% | 3.20%
Parts and Accessories [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 4.90% | 3.50% | 3.20%
Parts and Accessories [Member] | Product Manufacturing [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 0.80% | 0.70% | 1.20%
Brokerage Sales [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 4.80% | 5.80% | 5.60%
Brokerage Sales [Member] | Retail Operations [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 4.90% | 6.10% | 5.70%
Brokerage Sales [Member] | Product Manufacturing [Member] |  |  |
Product Information [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 0.60% | 0.50% |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-21 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-20 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-18 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-20 + Details
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