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Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2021
Estimated Life of Property and Equipment | Useful lives for purposes of computing depreciation are as follows:
|  | Years
Buildings and improvements |  | 5-40
Machinery and equipment |  | 3-10
Furniture and fixtures |  | 5-10
Vehicles |  | 3-5
Summary of Percentage on Timing of Revenue Recognition by Reportable Segment | The following table sets forth percentages on the timing of revenue recognition by reportable segment for the fiscal years ended September 30,
| Retail Operations |  |  | Product Manufacturing |
| 2019 |  |  | 2020 |  |  | 2021 |  |  | 2019 |  |  | 2020 |  |  | 2021 |
Goods and services transferred at a point in time |  | 90.8 | % |  |  | 92.7 | % |  |  | 91.6 | % |  |  | — |  |  |  | — |  |  |  | 100.0 | %
Goods and services transferred over time |  | 9.2 | % |  |  | 7.3 | % |  |  | 8.4 | % |  |  | — |  |  |  | — |  |  |  | — |
Revenue |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | % |  |  | — |  |  |  | — |  |  |  | 100.0 | %
Product Concentration Risk [Member] | Sales [Member] |
Summary of Revenue Disaggregated Into Categories Depict the Nature, Amount, Timing, and Uncertainty of Revenue and Cash Flows Affected by Economic Factor | The following tables set forth our revenue disaggregated into categories that depict the nature, amount, timing, and uncertainty of revenue and cash flows affected by economic factors for the fiscal years ended September 30,
|  | 2021 |
|  | Retail Operations |  |  | Product Manufacturing |  |  | Total |
New boat sales |  |  | 70.3 | % |  |  | 100.0 | % |  |  | 70.5 | %
Used boat sales |  |  | 11.0 | % |  |  | — |  |  |  | 10.9 | %
Maintenance, repair, storage, and charter services |  |  | 7.1 | % |  |  | — |  |  |  | 7.1 | %
Finance and insurance products |  |  | 2.7 | % |  |  | — |  |  |  | 2.7 | %
Parts and accessories |  |  | 3.2 | % |  |  | — |  |  |  | 3.2 | %
Brokerage sales |  |  | 5.7 | % |  |  | — |  |  |  | 5.6 | %
Revenue |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %
|  | 2020 |
|  | Retail Operations |  |  | Product Manufacturing |  |  | Total |
New boat sales |  |  | 70.2 | % |  |  | — |  |  |  | 70.2 | %
Used boat sales |  |  | 15.1 | % |  |  | — |  |  |  | 15.1 | %
Maintenance, repair, storage, and charter services |  |  | 6.4 | % |  |  | — |  |  |  | 6.4 | %
Finance and insurance products |  |  | 2.7 | % |  |  | — |  |  |  | 2.7 | %
Parts and accessories |  |  | 3.0 | % |  |  | — |  |  |  | 3.0 | %
Brokerage sales |  |  | 2.6 | % |  |  | — |  |  |  | 2.6 | %
Revenue |  |  | 100.0 | % |  |  | — |  |  |  | 100.0 | %
|  | 2019 |
|  | Retail Operations |  |  | Product Manufacturing |  |  | Total |
New boat sales |  |  | 70.1 | % |  |  | — |  |  |  | 70.1 | %
Used boat sales |  |  | 14.9 | % |  |  | — |  |  |  | 14.9 | %
Maintenance, repair, storage, and charter services |  |  | 6.9 | % |  |  | — |  |  |  | 6.9 | %
Finance and insurance products |  |  | 2.6 | % |  |  | — |  |  |  | 2.6 | %
Parts and accessories |  |  | 3.6 | % |  |  | — |  |  |  | 3.6 | %
Brokerage sales |  |  | 1.9 | % |  |  | — |  |  |  | 1.9 | %
Revenue |  |  | 100.0 | % |  |  | — |  |  |  | 100.0 | %

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