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Investments in Associated Companies Summarized Financial Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 26, 2017
Mar. 27, 2016
Mar. 26, 2017
Mar. 27, 2016
Schedule of Equity Method Investments [Line Items]        
Equity in earnings of associated companies $ 1,729,000 $ 2,009,000 $ 4,417,000 $ 4,808,000
Equity Method Investee- TNI [Member]        
Schedule of Equity Method Investments [Line Items]        
Proceeds from Equity Method Investment, Dividends or Distributions 1,437,000 2,251,000 2,420,000 3,729,000
Share of TNI Operating Expenses 159,000 (43,000) 301,000 (162,000)
Equity Method Investment, Summarized Financial Information, Revenue 12,507,000 14,039,000 25,821,000 28,821,000
Equity Method Investment, Summarized Financial Information, Operating Expenses Excluding Depreciation, Amortization And Workforce Adjustments 9,770,000 11,102,000 19,770,000 22,443,000
Equity Method Investment, Summarized Financial Information, Operating Income 2,737,000 2,937,000 6,051,000 6,378,000
Income (Loss) From Equity Method Investments Before Amortization 1,368,000 1,468,000 3,026,000 3,189,000
Amortization Of Intangible Assets- TNI 104,000 104,000 209,000 209,000
Equity in earnings of associated companies 1,264,000 1,364,000 2,817,000 2,980,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 418,000   418,000  
Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Two 418,000   418,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 418,000   418,000  
Equity Method Investee- MNI [Member]        
Schedule of Equity Method Investments [Line Items]        
Proceeds from Equity Method Investment, Dividends or Distributions 1,000,000 2,250,000 2,250,000 4,000,000
Equity Method Investment, Summarized Financial Information, Revenue 14,382,000 15,550,000 31,424,000 33,339,000
Equity Method Investment, Summarized Financial Information, Operating Expenses Excluding Depreciation, Amortization And Workforce Adjustments 12,548,000 13,047,000 25,928,000 26,660,000
Equity Method Investment, Summarized Financial Information, Workforce Adjustments 129,000 19,000 155,000 19,000
Equity Method Investment, Summarized Financial Information, Depreciation And Amortization 348,000 483,000 696,000 893,000
Equity Method Investment, Summarized Financial Information, Operating Income 1,357,000 2,001,000 4,645,000 5,767,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss) 929,000 1,290,000 3,200,000 3,648,000
Equity in earnings of associated companies $ 465,000 $ 645,000 $ 1,600,000 $ 1,828,000