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Investments in Associated Companies Summarized Financial Information (Details) - USD ($)
 12 Months Ended
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