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Investments in Associated Companies Summarized Financial Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 25, 2018
Mar. 26, 2017
Mar. 25, 2018
Mar. 26, 2017
Schedule of Equity Method Investments [Line Items]        
Equity in earnings of associated companies $ 1,608,000 $ 1,729,000 $ 3,991,000 $ 4,417,000
Equity Method Investee- TNI [Member]        
Schedule of Equity Method Investments [Line Items]        
Proceeds from Equity Method Investment, Distribution 1,631,000 1,437,000 3,198,000 2,420,000
Share of TNI Operating Expenses 127,000 159,000 261,000 301,000
Equity Method Investment, Summarized Financial Information, Revenue 11,851,000 12,507,000 25,081,000 25,821,000
Equity Method Investment, Summarized Financial Information, Operating Expenses Excluding Depreciation, Amortization And Workforce Adjustments 9,354,000 9,770,000 19,338,000 19,770,000
Equity Method Investment, Summarized Financial Information, Operating Income 2,497,000 2,737,000   6,051,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)     5,743,000  
Income (Loss) From Equity Method Investments Before Amortization 1,248,000 1,368,000 2,872,000 3,026,000
Amortization Of Intangible Assets- TNI 104,000 104,000 209,000 209,000
Equity in earnings of associated companies 1,144,000 1,264,000 2,663,000 2,817,000
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  
Equity Method Investee- MNI [Member]        
Schedule of Equity Method Investments [Line Items]        
Proceeds from Equity Method Investment, Distribution 1,250,000 1,000,000 2,000,000 2,250,000
Equity Method Investment, Summarized Financial Information, Revenue 13,838,000 14,382,000 29,903,000 31,424,000
Equity Method Investment, Summarized Financial Information, Operating Expenses Excluding Depreciation, Amortization And Workforce Adjustments 12,016,000 12,548,000 24,948,000 25,928,000
Equity Method Investment, Summarized Financial Information, Workforce Adjustments 146,000 129,000 210,000 155,000
Equity Method Investment, Summarized Financial Information, Depreciation And Amortization 280,000 348,000 558,000 696,000
Equity Method Investment, Summarized Financial Information, Operating Income 1,396,000 1,357,000 4,187,000 4,645,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss) 928,000 929,000 2,656,000 3,200,000
Equity in earnings of associated companies $ 464,000 $ 465,000 $ 1,328,000 $ 1,600,000