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Investments in Associated Companies Summarized Financial Information (Details) - USD ($) | 12 Months Ended
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Sep. 25, 2016 | Sep. 27, 2015 | Sep. 28, 2014
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in earnings of associated companies | $ 8,533,000 | $ 8,254,000 | $ 8,297,000
Associated companies | 29,716,000 | 35,069,000 |
Equity Method Investee- TNI [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Proceeds from Equity Method Investment, Dividends or Distributions | 6,636,000 | 5,475,000 | 5,246,000
Equity Method Investment, Summarized Financial Information, Accounts Receivable, Net | 5,107,000 | 5,761,000 |
Share of TNI Operating Expenses | 149,000 | (254,000) | (60,000)
Editorial Fees | 5,599,000 | 5,492,000 | 5,908,000
Equity Method Investment, Summarized Financial Information, Revenue | 52,761,000 | 55,926,000 | 57,892,000
Equity Method Investment, Summarized Financial Information, Cost of Sales | 41,804,000 | 45,413,000 | 47,229,000
Equity Method Investment, Summarized Financial Information, Operating Income | 10,957,000 | 10,513,000 | 10,663,000
Income (Loss) From Equity Method Investments Before Amortization | 5,478,000 | 5,256,000 | 5,331,000
Amortization Of Intangible Assets- TNI | 418,000 | 418,000 | 418,000
Equity in earnings of associated companies | 5,060,000 | 4,838,000 | 4,913,000
Associated companies | 15,933,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 418,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Two | 418,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 418,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 280,000 |  |
Equity Method Investment, Summarized Financial Information, Noncurrent Assets | 12,000 | 33,000 |
Equity Method Investment, Summarized Financial Information, Assets | 5,119,000 | 5,794,000 |
Equity Method Investment, Summarized Financial Information, Liabilities | 6,484,000 | 4,787,000 |
Equity Method Investment Summarized Financial Information, Equity | (1,365,000) | 1,007,000 |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | 5,119,000 | 5,794,000 |
Equity Method Investee- MNI [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Proceeds from Equity Method Investment, Dividends or Distributions | 7,250,000 | 5,500,000 | 4,750,000
Equity Method Investment, Summarized Financial Information, Current Assets | 12,320,000 | 18,255,000 |
Editorial Fees | 7,099,000 | 7,242,000 | 7,050,000
Equity Method Investment, Summarized Financial Information, Depreciation And Amortization |  |  | 1,626,000
Equity Method Investment, Summarized Financial Information, Cost of Sales | 52,646,000 | 54,795,000 | 55,393,000
Equity Method Investment, Summarized Financial Information, Operating Income | 10,803,000 | 10,380,000 |
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | 6,947,000 | 6,832,000 |
Equity in earnings of associated companies |  |  | $ 3,384,000
Associated companies | 13,896,000 |  |
Equity Method Investment, Summarized Financial Information, Noncurrent Assets | 33,364,000 | 34,209,000 |
Equity Method Investment, Summarized Financial Information, Assets | 45,684,000 | 52,464,000 |
Equity Method Investment, Summarized Financial Information, Current Liabilities | 8,391,000 | 8,100,000 |
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities | 9,500,000 | 9,235,000 |
Equity Method Investment Summarized Financial Information, Equity | 27,793,000 | 35,129,000 |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | $ 45,684,000 | 52,464,000 |
Equity Method Investee- MNI [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Less Than 100% Owned Subsidiaries, Percentage Owned | 50.00% |  |
Goodwill [Member] | Equity Method Investee- TNI [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | $ 12,366,000,000 |  |
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 |  | $ 4,554,000 |

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