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Investments in Associated Companies Summarized Financial Information (Details) - USD ($) | 12 Months Ended
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Sep. 24, 2017 | Sep. 25, 2016 | Sep. 27, 2015
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in earnings of associated companies | $ 7,609,000 | $ 8,533,000 | $ 8,254,000
Associated companies | 29,181,000 | 29,716,000 |
Equity Method Investee- TNI [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Proceeds from Equity Method Investment, Distribution | 4,644,000 | 6,636,000 | 5,475,000
Equity Method Investment, Summarized Financial Information, Current Assets | 4,457,000 | 5,107,000 |
Equity Method Investment, Summarized Financial Information, Revenue | 48,297,000 | 52,761,000 | 55,926,000
Equity Method Investment, Summarized Financial Information, Cost of Sales | 38,150,000 | 41,804,000 | 45,413,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | 10,147,000 | 10,957,000 | 10,513,000
Income (Loss) From Equity Method Investments Before Amortization | 5,073,000 | 5,478,000 | 5,256,000
Amortization Of Intangible Assets- TNI | 418,000 | 418,000 | 418,000
Equity in earnings of associated companies | 4,655,000 | 5,060,000 | 4,838,000
Associated companies | 15,943,000 |  |
Equity Method Investment, Summarized Financial Information, Noncurrent Assets | 12,000 | 12,000 |
Equity Method Investment, Summarized Financial Information, Assets | 4,469,000 | 5,119,000 |
Equity Method Investment, Summarized Financial Information, Current Liabilities | 5,485,000 | 6,484,000 |
Equity Method Investment Summarized Financial Information, Equity | (1,016,000) | (1,365,000) |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | 4,469,000 | 5,119,000 |
Equity Method Investee- MNI [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Proceeds from Equity Method Investment, Distribution | 3,500,000 | 7,250,000 | 7,050,000
Equity Method Investment, Summarized Financial Information, Current Assets | 11,297,000 | 12,320,000 |
Editorial Fees | 7,021,000 | 7,099,000 | 7,242,000
Equity Method Investment, Summarized Financial Information, Revenue | 61,396,000 | 65,172,000 | 67,264,000
Equity Method Investment, Summarized Financial Information, Cost of Sales | 51,392,000 | 52,646,000 | 54,795,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | 5,908,000 | 6,947,000 | 6,832,000
Equity in earnings of associated companies | 2,954,000 | 3,473,000 | 3,416,000
Associated companies | 13,238,000 |  |
Equity Method Investment, Summarized Financial Information, Noncurrent Assets | 32,530,000 | 33,364,000 |
Equity Method Investment, Summarized Financial Information, Assets | 43,827,000 | 45,684,000 |
Equity Method Investment, Summarized Financial Information, Current Liabilities | 7,852,000 | 8,391,000 |
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities | 9,500,000 | 9,500,000 |
Equity Method Investment Summarized Financial Information, Equity | 26,475,000 | 27,793,000 |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | 43,827,000 | 45,684,000 |
Equity Method Investment, Summarized Financial Information, Workforce Adjustments | 296,000 | 39,000 | 459,000
Equity Method Investment, Summarized Financial Information, Depreciation And Amortization | 1,295,000 | 1,684,000 | 1,630,000
Equity Method Investment, Summarized Financial Information, Operating Income | 8,413,000 | $ 10,803,000 | $ 10,380,000
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 | $ 4,136,000 |  |

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