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Supplementary Balance Sheet Information (Schedule Of Other Long-Term Liabilities) (Details) - USD ($)	Sep. 25, 2021	Sep. 26, 2020
Supplementary Balance Sheet Information [Line Items]
Advance payments on purchases contracts	$ 2,264,784	$ 2,826,171
Nonqualified investment plan liability	22,736,980	18,049,600
Interest rate swap liability	4,531,140	13,562,296
Other	3,211,513	2,570,453
Other long-term liabilities	51,532,388	57,045,546
Less current portion	1,113,441	1,385,603
Total other long-term liabilities	50,418,947	55,659,943
Workers Compensation Insurance [Member]
Supplementary Balance Sheet Information [Line Items]
Self-insurance liabilities	14,501,624	16,003,064
General Liability [Member]
Supplementary Balance Sheet Information [Line Items]
Self-insurance liabilities	$ 4,286,347	$ 4,033,962

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Carrying value as of the balance sheet date of obligations incurred through that date and due beyond one year (or beyond one operating cycle if longer) to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverages to employees.

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