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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
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Dec. 31, 2024 | Dec. 31, 2023
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 100.00% | 100.00%
Retail Operations [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 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 | 58.80% | 66.40%
New Boat Sales [Member] | Retail Operations [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 58.70% | 66.30%
New Boat Sales [Member] | Product Manufacturing [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 98.80% | 98.90%
Used Boat Sales [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 11.10% | 7.80%
Used Boat Sales [Member] | Retail Operations [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 11.10% | 7.90%
Maintenance and Repair Services [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 6.40% | 5.90%
Maintenance and Repair Services [Member] | Retail Operations [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 6.40% | 5.90%
Storage and Charter Rentals [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 9.30% | 7.70%
Storage and Charter Rentals [Member] | Retail Operations [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 9.40% | 7.70%
Finance and Insurance Products [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 3.10% | 2.40%
Finance and Insurance Products [Member] | Retail Operations [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 3.10% | 2.40%
Parts and Accessories [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 5.70% | 5.10%
Parts and Accessories [Member] | Retail Operations [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 5.70% | 5.10%
Parts and Accessories [Member] | Product Manufacturing [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 1.20% | 1.10%
Brokerage Sales [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 5.60% | 4.70%
Brokerage Sales [Member] | Retail Operations [Member] |  |
Product Information [Line Items] |  |
Sales Revenue Goods And Services Net Percentage | 5.60% | 4.70%

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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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