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Long-Term Debt (Schedule of Long-Term Debt And Short-Term Loans) (Details) - USD ($)	Sep. 28, 2019	Sep. 29, 2018
Debt Instrument [Line Items]
Less unamortized prepaid loan costs	$ (5,270,760)	$ (6,038,125)
Total long-term debt	852,237,822	865,587,773
Less current portion	12,600,131	12,848,013
Long-term debt, net of current portion	839,637,691	852,739,760
Senior Notes, Interest Rate of 5.75%, Maturing 2023 [Member]
Debt Instrument [Line Items]
Bonds payable	$ 700,000,000	$ 700,000,000
Interest rate	5.75%	5.75%
Recovery Zone Facility Bonds [Member]
Debt Instrument [Line Items]
Bonds payable	$ 72,560,000	$ 77,090,000
Line of Credit Payable [Member]
Debt Instrument [Line Items]
Weighted average interest rate	5.75%
Notes payable due to banks, weighted average interest rate of 4.43% for 2019
Debt Instrument [Line Items]
Notes payable	$ 84,948,582	$ 94,535,898
Weighted average interest rate	4.43%	3.68%

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