Investments in Associated Companies - Summarized Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 24, 2023	Sep. 25, 2022	Sep. 26, 2021
ASSETS
Current assets	$ 106,529	$ 109,123
Total assets	711,617	744,042
LIABILITIES AND MEMBERS' EQUITY (DEFICIT)
Liabilities	687,911	726,805
Current liabilities	114,336	131,136
Members' equity	21,240	15,005	$ 41,097
Total liabilities and members' equity (deficit)	711,617	744,042
Operating revenue	691,138	780,969	794,649
Operating expenses	660,496	761,775	744,505
Restructuring costs and other	12,673	22,720	7,182
Operating income	37,169	24,851	56,556
Net income	(5,267)	(2,017)	22,745
Less amortization of intangible assets	19,000	22,200	24,900
Equity in earnings	6,527	5,657	6,412
TNI Partners
LIABILITIES AND MEMBERS' EQUITY (DEFICIT)
Company's 50% share	3,571	4,354	4,731
Less amortization of intangible assets	0	0	0
Equity in earnings	3,571	4,354	4,731
MNI
LIABILITIES AND MEMBERS' EQUITY (DEFICIT)
Equity in earnings	2,956	1,303	1,681
TNI Partners
ASSETS
Current assets	1,901	2,801
Investments and other assets	1,240	1,584
Total assets	3,141	4,385
LIABILITIES AND MEMBERS' EQUITY (DEFICIT)
Liabilities	3,837	5,005
Members' equity	(696)	(620)
Total liabilities and members' equity (deficit)	3,141	4,385
Operating revenue	31,076	34,153	34,782
Operating expenses	24,446	25,445	25,320
Operating income	6,630	8,708	9,462
Net income	7,142	8,708	9,462
MNI
ASSETS
Current assets	8,916	5,837
Investments and other assets	29,267	29,903
Total assets	38,183	35,740
LIABILITIES AND MEMBERS' EQUITY (DEFICIT)
Current liabilities	6,352	5,922
Other liabilities	6,303	5,696
Members' equity	25,528	24,122
Total liabilities and members' equity (deficit)	38,183	35,740
Operating revenue	44,109	47,621	46,015
Operating expenses	30,654	37,922	35,583
Restructuring costs and other	143	169	107
Depreciation and amortization	539	672	711
Operating income	12,773	8,858	9,614
Net income	$ 5,911	$ 2,605	$ 3,362