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Short-Term Borrowings and Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Debt Instrument [Line Items]    
Less current portion $ (2,802)  
Less unamortized portion of debt issuance costs (643)  
Long-term debt 49,440 $ 7,343
Mortgage Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt 52,885  
Mortgage Facility [Member] | Mortgage Facility Payable to Flagship Bank [Member]    
Debt Instrument [Line Items]    
Long-term debt 7,148  
Mortgage Facility [Member] | Mortgage Facility Payable to Seacoast National Bank [Member]    
Debt Instrument [Line Items]    
Long-term debt 17,675  
Mortgage Facility [Member] | Mortgage facility payable to Hancock Whitney Bank [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 28,062