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Short-Term Borrowings and Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Debt Instrument [Line Items]    
Less: current portion $ (33,766) $ (33,767)
Less: unamortized portion of debt issuance costs (1,637) (1,901)
Long-term debt, net current portion and unamortized debt issuance costs 364,138 389,231
Mortgage Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt 399,541 424,899
Mortgage Facility [Member] | Mortgage Facility Payable to Flagship Bank [Member]    
Debt Instrument [Line Items]    
Long-term debt 5,535 5,907
Mortgage Facility [Member] | Mortgage Facility Payable to Seacoast National Bank [Member]    
Debt Instrument [Line Items]    
Long-term debt 15,717 16,735
Mortgage Facility [Member] | Mortgage facility payable to Hancock Whitney Bank [Member]    
Debt Instrument [Line Items]    
Long-term debt 21,844 23,279
Term Loan [Member] | Term loan payable to M&T Bank [Member]    
Debt Instrument [Line Items]    
Long-term debt 355,000 377,500
Term Loan [Member] | Loan payable to TRANSPORT S.a.s di Taula Vittorio and C. [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 1,445 $ 1,478