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Notes Payable - Floor Plan (Details) - Inventory Financing Facility - USD ($) $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 | Nov. 13, 2024 | Sep. 30, 2024 | Nov. 14, 2023
Line of Credit Facility [Abstract] |  |  |  |
Maximum borrowing capacity |  | $ 595.0 |  | $ 650.0
Outstanding balance of facility | $ 435.8 |  | $ 443.4 |
Line of credit facility, remaining borrowing capacity | $ 159.2 |  | $ 206.6 |
Minimum | New Inventory |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Credit facility, interest rate | 7.18% |  | 8.03% |
Minimum | Pre-owned Inventory |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Credit facility, interest rate | 7.43% |  | 8.28% |
Maximum | New Inventory |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Credit facility, interest rate | 9.43% |  | 10.28% |
Maximum | Pre-owned Inventory |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Credit facility, interest rate | 9.68% |  | 10.53% |
Wells Fargo |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Percentage of finance provided of vendor invoice price | 100.00% |  |  |
SOFR |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Debt instrument, term of variable rate | 30 days |  |  |
SOFR | Minimum | New Boats |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Debt instrument, variable interest rate | 2.75% |  |  |
SOFR | Maximum | New Boats |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Debt instrument, variable interest rate | 5.00% |  |  |
Boat Rate | Pre-owned Inventory |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Debt instrument, variable interest rate | 0.25% |  |  |

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- Definition Term of the interest rate that fluctuates over time as a result of an underlying benchmark interest rate or index in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition The percentage of finance provided of vendor invoice price for new boats, engines and trailers. + References No definition available. + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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