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Long-term Debt and Line of Credit - Summary of Long-term Debt and Line of Credit (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Sep. 30, 2023
Debt Instrument [Line Items] |  |
Total debt outstanding | $ 426,432,000 | $ 465,140,000
Less current portion (net of debt issuance costs) | (8,640,000) | (29,324,000)
Less unamortized portion of debt issuance costs | (7,100,000) | (7,377,000)
Long-term debt, net of current portion and unamortized debt issuance costs | 410,692,000 | 428,439,000
Term note payable to Truist Bank, secured and bearing interest at 7.83% at March 31, 2024 and 7.53% at September 30, 2023. The note requires quarterly principal payments commencing on December 31, 2022 and maturing with a full repayment on August 9, 2027 |  |
Debt Instrument [Line Items] |  |
Total debt outstanding | $ 392,156,000 | $ 428,313,000
Debt instrument, interest rate, stated percentage | 7.83% | 7.53%
Revolving note payable for an amount up to $65.0 million to Truist Bank, secured and bearing interest at 7.83% at March 31, 2024 and 7.50% at September 30, 2023. The note requires full repayment on August 9, 2027 |  |
Debt Instrument [Line Items] |  |
Total debt outstanding | $ 30,000,000 | $ 30,000,000
Debt instrument, interest rate, stated percentage | 7.83% | 7.50%
Line of credit facility, maximum borrowing capacity | $ 65,000,000 |
Notes payable to commercial vehicle lenders secured by the value of the vehicles bearing interest at rates ranging from 0.0% to 10.8% per annum. The notes require monthly installment payments of principal and interest ranging from $200 to $3,100 through April 2029 |  |
Debt Instrument [Line Items] |  |
Total debt outstanding | $ 3,150,000 | $ 3,645,000
Notes payable to commercial vehicle lenders secured by the value of the vehicles bearing interest at rates ranging from 0.0% to 10.8% per annum. The notes require monthly installment payments of principal and interest ranging from $200 to $3,100 through April 2029 | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 0.00% |
Debt instrument, periodic payment | $ 200,000 |
Notes payable to commercial vehicle lenders secured by the value of the vehicles bearing interest at rates ranging from 0.0% to 10.8% per annum. The notes require monthly installment payments of principal and interest ranging from $200 to $3,100 through April 2029 | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 10.80% |
Debt instrument, periodic payment | $ 3,100,000 |
Note payable to Norfolk Marine Company, unsecured and bearing interest at 4.0% per annum. The note requires quarterly interest payments, with a balloon payment of principal due on December 1, 2024 |  |
Debt Instrument [Line Items] |  |
Total debt outstanding | $ 1,126,000 | 1,126,000
Debt instrument, interest rate, stated percentage | 4.00% |
Note payable to Tom George Yacht Group, unsecured and bearing interest at 5.5% per annum. The note requires quarterly interest payments, with a balloon payment of principal due on December 1, 2023 |  |
Debt Instrument [Line Items] |  |
Total debt outstanding | $ 0 | $ 2,056,000
Debt instrument, interest rate, stated percentage | 5.50% |

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