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Supplementary Balance Sheet Information (Schedule Of Other Long-Term Liabilities) (Details) - USD ($) | Sep. 24, 2016 | Sep. 26, 2015
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Supplementary Balance Sheet Information [Line Items] |  |
Advance payments on purchases contracts | $ 1,624,792 | $ 1,704,061
Deferred lease expense | 1,884,501 | 1,906,317
Nonqualified investment plan liability | 10,692,707 | 8,866,880
Other | 1,655,285 | 1,484,815
Total other long-term liabilities | 37,659,479 | 35,513,775
Less current portion | 883,892 | 952,661
Other long-term liabilities, net of current portion | 36,775,587 | 34,561,114
Workers' Compensation Insurance [Member] |  |
Supplementary Balance Sheet Information [Line Items] |  |
Self-insurance liabilities | 18,101,931 | 17,819,587
General Liability Insurance [Member] |  |
Supplementary Balance Sheet Information [Line Items] |  |
Self-insurance liabilities | $ 3,700,263 | $ 3,732,115

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