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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 24, 2019 | Sep. 25, 2018 | Sep. 26, 2017 | Sep. 27, 2016 | Sep. 30, 2015 | Sep. 30, 2012
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Net operating loss carry forwards | $ 3,694,000 | $ 4,538,000 | $ 10,229,000 |  |  |
Operating loss carry-forwards utilization limit |  |  |  |  |  | $ 160,000
General business tax credits | $ 3,065,000 | $ 3,065,000 | $ 3,065,000 | $ 3,065,000 | $ 3,065,000 |
U.S. statutory rate | 21.00% | 28.10% | 35.00% |  |  |
Tax expense from remeasurement of existing deferred tax assets and liabilities | $ 1,300,000 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards, Expiration year | 2025 |  |  |  |  |
General business tax credits expiration year | 2034 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards, Expiration year | 2038 |  |  |  |  |
General business tax credits expiration year | 2039 |  |  |  |  |

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