Investments in Associated Companies Summarized Financial Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 25, 2018	Mar. 31, 2019	Mar. 25, 2018
Schedule of Equity Method Investments [Line Items]
Equity in earnings of associated companies	$ 1,717,000	$ 1,608,000	$ 3,846,000	$ 3,991,000
Equity Method Investee- TNI [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from Equity Method Investment, Distribution	1,957,000	1,631,000	2,506,000	3,198,000
Equity Method Investment, Summarized Financial Information, Revenue	11,480,000	11,851,000	23,644,000	25,081,000
Equity Method Investment, Summarized Financial Information, Operating Expenses Excluding Depreciation, Amortization And Workforce Adjustments	8,832,000	9,354,000	17,928,000	19,338,000
Equity Method Investment, Summarized Financial Information, Operating Income	2,648,000	2,497,000		5,743,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)			5,716,000
Income (Loss) From Equity Method Investments Before Amortization	1,323,000	1,248,000	2,858,000	2,872,000
Amortization Of Intangible Assets- TNI	105,000	104,000	209,000	209,000
Equity in earnings of associated companies	1,218,000	1,144,000	2,649,000	2,663,000
Equity Method Investee- MNI [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from Equity Method Investment, Distribution	750,000		1,500,000	$ 1,250,000
Equity Method Investment, Summarized Financial Information, Revenue	13,092,000	13,838,000	27,918,000
Equity Method Investment, Summarized Financial Information, Operating Expenses Excluding Depreciation, Amortization And Workforce Adjustments	11,579,000	12,016,000	24,272,000
Equity Method Investment, Summarized Financial Information, Workforce Adjustments	38,000	146,000	68,000
Equity Method Investment, Summarized Financial Information, Depreciation And Amortization	280,000	280,000	559,000
Equity Method Investment, Summarized Financial Information, Operating Income	1,195,000	1,396,000	3,019,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	996,000	928,000	2,394,000
Equity in earnings of associated companies	$ 499,000	$ 464,000	$ 1,197,000