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Long-Term Debt (Schedule of Long-Term Debt and Short-Term Loans) (Details) - USD ($)	Sep. 28, 2024	Sep. 30, 2023	Jun. 30, 2021
Debt Instrument [Line Items]
Less unamortized prepaid loan costs	$ (4,607,467)	$ (5,351,705)
Total long-term debt	532,622,438	550,158,249
Less current portion	17,520,876	17,526,289
Long-term debt, net of current portion	515,101,562	532,631,960
Senior Notes, Maturing 2031 [Member]
Debt Instrument [Line Items]
Bonds payable	$ 350,000,000	$ 350,000,000
Interest rate	4.00%	4.00%	4.00%
Recovery Zone Facility Bonds [Member]
Debt Instrument [Line Items]
Bonds payable	$ 49,910,000	$ 54,440,000
Notes Payable Due to Banks [Member]
Debt Instrument [Line Items]
Notes payable	$ 137,319,905	$ 151,069,954
Weighted average interest rate	7.49%	6.29%

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