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