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Investments in Associated Companies Summarized Financial Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 25, 2018 | Mar. 31, 2019 | Mar. 25, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity in earnings of associated companies | $ 1,717,000 | $ 1,608,000 | $ 3,846,000 | $ 3,991,000
Equity Method Investee- TNI [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Proceeds from Equity Method Investment, Distribution | 1,957,000 | 1,631,000 | 2,506,000 | 3,198,000
Equity Method Investment, Summarized Financial Information, Revenue | 11,480,000 | 11,851,000 | 23,644,000 | 25,081,000
Equity Method Investment, Summarized Financial Information, Operating Expenses Excluding Depreciation, Amortization And Workforce Adjustments | 8,832,000 | 9,354,000 | 17,928,000 | 19,338,000
Equity Method Investment, Summarized Financial Information, Operating Income | 2,648,000 | 2,497,000 |  | 5,743,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss) |  |  | 5,716,000 |
Income (Loss) From Equity Method Investments Before Amortization | 1,323,000 | 1,248,000 | 2,858,000 | 2,872,000
Amortization Of Intangible Assets- TNI | 105,000 | 104,000 | 209,000 | 209,000
Equity in earnings of associated companies | 1,218,000 | 1,144,000 | 2,649,000 | 2,663,000
Equity Method Investee- MNI [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Proceeds from Equity Method Investment, Distribution | 750,000 |  | 1,500,000 | $ 1,250,000
Equity Method Investment, Summarized Financial Information, Revenue | 13,092,000 | 13,838,000 | 27,918,000 |
Equity Method Investment, Summarized Financial Information, Operating Expenses Excluding Depreciation, Amortization And Workforce Adjustments | 11,579,000 | 12,016,000 | 24,272,000 |
Equity Method Investment, Summarized Financial Information, Workforce Adjustments | 38,000 | 146,000 | 68,000 |
Equity Method Investment, Summarized Financial Information, Depreciation And Amortization | 280,000 | 280,000 | 559,000 |
Equity Method Investment, Summarized Financial Information, Operating Income | 1,195,000 | 1,396,000 | 3,019,000 |
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | 996,000 | 928,000 | 2,394,000 |
Equity in earnings of associated companies | $ 499,000 | $ 464,000 | $ 1,197,000 |

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