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Short-Term Borrowings and Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Debt Instrument [Line Items]
Less: current portion	$ (33,766)	$ (33,766)
Less: unamortized portion of debt issuance costs	(1,288)	(1,514)
Long-term debt, net current portion and unamortized debt issuance costs	339,054	355,906
Mortgage Facility [Member]
Debt Instrument [Line Items]
Long-term debt	374,108	391,186
Mortgage Facility [Member] | Mortgage Facility Payable to Flagship Bank [Member]
Debt Instrument [Line Items]
Long-term debt	5,163	5,411
Mortgage Facility [Member] | Mortgage Facility Payable to Seacoast National Bank [Member]
Debt Instrument [Line Items]
Long-term debt	14,699	15,378
Mortgage Facility [Member] | Mortgage facility payable to Hancock Whitney Bank [Member]
Debt Instrument [Line Items]
Long-term debt	20,409	21,366
Term Loan [Member] | Term loan payable to M&T Bank [Member]
Debt Instrument [Line Items]
Long-term debt	332,500	347,500
Term Loan [Member] | Loan payable to TRANSPORT S.a.s di Taula Vittorio and C. [Member]
Debt Instrument [Line Items]
Long-term debt	$ 1,337	$ 1,531

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