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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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