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Investments in Associated Companies Summarized Financial Information (Details) - USD ($)
 3 Months Ended
Dec. 30, 2018
Dec. 24, 2017
Schedule of Equity Method Investments [Line Items]    
Equity in earnings of associated companies $ 2,129,000 $ 2,383,000
Equity Method Investee- TNI [Member]    
Schedule of Equity Method Investments [Line Items]    
Proceeds from Equity Method Investment, Distribution 549,000 1,567,000
Equity Method Investment, Summarized Financial Information, Revenue 12,164,000 13,230,000
Equity Method Investment, Summarized Financial Information, Operating Expenses Excluding Depreciation, Amortization And Workforce Adjustments 9,095,000 9,982,000
Equity Method Investment, Summarized Financial Information, Operating Income 3,069,000 3,248,000
Income (Loss) From Equity Method Investments Before Amortization 1,535,000 1,624,000
Amortization Of Intangible Assets- TNI 105,000 105,000
Equity in earnings of associated companies 1,430,000 1,519,000
Equity Method Investee- MNI [Member]    
Schedule of Equity Method Investments [Line Items]    
Proceeds from Equity Method Investment, Distribution 750,000  
Equity Method Investment, Summarized Financial Information, Revenue 14,826,000 16,065,000
Equity Method Investment, Summarized Financial Information, Operating Expenses Excluding Depreciation, Amortization And Workforce Adjustments 12,663,000 12,932,000
Equity Method Investment, Summarized Financial Information, Workforce Adjustments 30,000 64,000
Equity Method Investment, Summarized Financial Information, Depreciation And Amortization 280,000 279,000
Equity Method Investment, Summarized Financial Information, Operating Income 1,853,000 2,790,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss) 1,398,000 1,728,000
Equity in earnings of associated companies $ 699,000 $ 864,000