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Long-Term Debt (Schedule of Long-Term Debt and Short-Term Loans) (Details) - USD ($)
Sep. 30, 2023
Sep. 24, 2022
Jun. 30, 2021
Debt Instrument [Line Items]      
Less unamortized prepaid loan costs $ (5,351,705) $ (6,083,304)  
Total long-term debt 550,158,249 571,908,209  
Less current portion 17,526,289 17,620,789  
Long-term debt, net of current portion 532,631,960 554,287,420  
Senior Notes, Maturing 2031 [Member]      
Debt Instrument [Line Items]      
Bonds payable $ 350,000,000 350,000,000  
Interest rate 4.00%   4.00%
Recovery Zone Facility Bonds [Member]      
Debt Instrument [Line Items]      
Bonds payable $ 54,440,000 58,970,000  
Notes Payable Due to Banks [Member]      
Debt Instrument [Line Items]      
Notes payable $ 151,069,954 $ 169,021,513  
Weighted average interest rate 6.29% 2.31%