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Short-Term Borrowings and Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Debt Instrument [Line Items]    
Less: current portion $ (3,587) $ (3,587)
Less: unamortized portion of debt issuance costs (553) (595)
Long-term debt, net current portion and unamortized debt issuance costs 45,747 47,498
Mortgage Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt 49,887 51,680
Mortgage Facility [Member] | Mortgage Facility Payable to Flagship Bank [Member]    
Debt Instrument [Line Items]    
Long-term debt 6,652 6,899
Mortgage Facility [Member] | Mortgage Facility Payable to Seacoast National Bank [Member]    
Debt Instrument [Line Items]    
Long-term debt 17,086 17,675
Mortgage Facility [Member] | Mortgage facility payable to Hancock Whitney Bank [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 26,149 $ 27,106