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Supplementary Balance Sheet Information (Schedule Of Other Long-Term Liabilities) (Details) - USD ($) | Sep. 29, 2018 | Sep. 30, 2017
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Supplementary Balance Sheet Information [Line Items] |  |
Advance payments on purchases contracts | $ 3,115,106 | $ 3,185,034
Deferred lease expense | 1,941,708 | 1,913,811
Nonqualified investment plan liability | 15,033,318 | 13,303,318
Other | 2,124,800 | 1,867,015
Other long-term liabilities | 43,324,934 | 42,080,066
Less current portion | 1,166,773 | 967,518
Total other long-term liabilities | 42,158,161 | 41,112,548
Workers' Compensation Insurance [Member] |  |
Supplementary Balance Sheet Information [Line Items] |  |
Self-insurance liabilities | 16,333,768 | 17,147,541
General Liability Insurance [Member] |  |
Supplementary Balance Sheet Information [Line Items] |  |
Self-insurance liabilities | $ 4,776,234 | $ 4,663,347

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