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Long-Term Debt (Schedule Of Long-Term Debt And Short-Term Loans) (Details) - USD ($)
Sep. 24, 2022
Sep. 25, 2021
Jun. 30, 2021
Jun. 20, 2020
Debt Instrument [Line Items]        
Less unamortized prepaid loan costs $ (6,083,304) $ (6,845,074)    
Total long-term debt 571,908,209 589,513,943    
Less current portion 17,620,789 17,600,739    
Long-term debt, net of current portion 554,287,420 571,913,204    
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member]        
Debt Instrument [Line Items]        
Interest rate       5.75%
Senior Notes, Interest Rate of 4.00%, 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 $ 58,970,000 63,500,000    
Notes payable due to banks, weighted average interest rate of 2.31% for 2022 and 1.74% for 2021 [Member]        
Debt Instrument [Line Items]        
Notes payable $ 169,021,513 $ 182,859,017    
Weighted average interest rate 2.31% 1.74%