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Investments in Associated Companies Summarized Financial Information (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2018 | Sep. 24, 2017 | Sep. 25, 2016
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in earnings of associated companies | $ 9,249,000 | $ 7,609,000 | $ 8,533,000
Associated companies | 29,216,000 | 29,181,000 |
Equity Method Investee- TNI [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Proceeds from Equity Method Investment, Distribution | 5,814,000 | 4,644,000 | 6,636,000
Equity Method Investment, Summarized Financial Information, Current Assets | 3,615,000 | 4,457,000 |
Equity Method Investment, Summarized Financial Information, Revenue | 47,165,000 | 48,297,000 | 52,761,000
Equity Method Investment, Summarized Financial Information, Cost of Sales | 37,090,000 | 38,150,000 | 41,804,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | 10,075,000 | 10,147,000 | 10,957,000
Income (Loss) From Equity Method Investments Before Amortization | 5,038,000 | 5,073,000 | 5,478,000
Amortization Of Intangible Assets- TNI | 418,000 | 418,000 | 418,000
Equity in earnings of associated companies | 4,620,000 | 4,655,000 | 5,060,000
Associated companies | 14,749,000 |  |
Equity Method Investment, Summarized Financial Information, Noncurrent Assets | 0 | 12,000 |
Equity Method Investment, Summarized Financial Information, Assets | 3,615,000 | 4,469,000 |
Equity Method Investment, Summarized Financial Information, Current Liabilities | 5,213,000 | 5,485,000 |
Equity Method Investment Summarized Financial Information, Equity | (1,598,000) | (1,016,000) |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | 3,615,000 | 4,469,000 |
Equity Method Investee- MNI [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Proceeds from Equity Method Investment, Distribution | 3,400,000 | 3,500,000 | 7,250,000
Equity Method Investment, Summarized Financial Information, Current Assets | 10,173,000 | 11,297,000 |
Editorial Fees | 6,718,000 | 7,021,000 | 7,099,000
Equity Method Investment, Summarized Financial Information, Revenue | 59,670,000 | 61,396,000 | 65,172,000
Equity Method Investment, Summarized Financial Information, Operating Expenses Excluding Depreciation, Amortization And Workforce Adjustments | 49,598,000 |  |
Equity Method Investment, Summarized Financial Information, Cost of Sales |  | 51,392,000 | 52,646,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | 9,257,000 | 5,908,000 | 6,947,000
Equity in earnings of associated companies | 4,629,000 | 2,954,000 | 3,473,000
Associated companies | 14,467,000 |  |
Equity Method Investment, Summarized Financial Information, Noncurrent Assets | 33,295,000 | 32,530,000 |
Equity Method Investment, Summarized Financial Information, Assets | 43,468,000 | 43,827,000 |
Equity Method Investment, Summarized Financial Information, Current Liabilities | 7,274,000 | 7,852,000 |
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities | 7,261,000 | 9,500,000 |
Equity Method Investment Summarized Financial Information, Equity | 28,933,000 | 26,475,000 |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | 43,468,000 | 43,827,000 |
Equity Method Investment, Summarized Financial Information, Workforce Adjustments | 383,000 | 296,000 | 39,000
Equity Method Investment, Summarized Financial Information, Depreciation And Amortization | 1,149,000 | 1,295,000 | 1,684,000
Equity Method Investment, Summarized Financial Information, Operating Income | 8,540,000 | $ 8,413,000 | $ 10,803,000
Goodwill [Member] | Equity Method Investee- TNI [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 12,366,000 |  |
Finite Lived Intangible Assets [Member] | Equity Method Investee- TNI [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | $ 3,717,000 |  |

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