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Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2015
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
Product Concentration Risk [Member] | Sales [Member] |
Summary of Percentages of Revenue Generated by Products and Services | The following table sets forth percentages of our revenue generated by certain products and services, for each of last three fiscal years.
|  | 2013 |  |  | 2014 |  |  | 2015 |
New boat sales |  |  | 61.9 | % |  |  | 65.2 | % |  |  | 64.3 | %
Used boat sales |  |  | 19.4 | % |  |  | 16.8 | % |  |  | 19.9 | %
Maintenance, repair, storage, and charter services |  |  | 8.0 | % |  |  | 7.8 | % |  |  | 6.9 | %
Finance and insurance products |  |  | 2.8 | % |  |  | 2.6 | % |  |  | 2.5 | %
Parts and accessories |  |  | 5.5 | % |  |  | 5.1 | % |  |  | 4.1 | %
Brokerage sales |  |  | 2.4 | % |  |  | 2.5 | % |  |  | 2.3 | %
Total revenue |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %

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