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Short-Term Borrowings and Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Less: current portion | $ (33,766) | $ (33,767)
Less: unamortized portion of debt issuance costs | (1,707) | (1,901)
Long-term debt, net current portion and unamortized debt issuance costs | 372,624 | 389,231
Mortgage Facility [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 408,097 | 424,899
Mortgage Facility [Member] | Mortgage Facility Payable to Flagship Bank [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 5,659 | 5,907
Mortgage Facility [Member] | Mortgage Facility Payable to Seacoast National Bank [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 16,056 | 16,735
Mortgage Facility [Member] | Mortgage facility payable to Hancock Whitney Bank [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 22,322 | 23,279
Term Loan [Member] | Term loan payable to M&T Bank [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 362,500 | 377,500
Term Loan [Member] | Loan payable to TRANSPORT S.a.s di Taula Vittorio and C. [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,560 | $ 1,478

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