Investments In Associated Companies - Summarized Financial Results (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 25, 2023	Jun. 26, 2022	Jun. 25, 2023	Jun. 26, 2022
Schedule of Equity Method Investments [Line Items]
Operating revenue	$ 171,310	$ 195,037	$ 527,129	$ 587,333
Operating expenses	160,296	189,648	504,418	563,219
Restructuring costs	3,780	6,072	8,120	19,862
Depreciation and amortization	7,478	8,818	23,097	27,445
Operating income	12,208	6,439	26,245	28,325
Net income	2,134	196	(1,407)	6,701
Equity in earnings	1,194	1,050	3,534	4,211
TNI Partners
Schedule of Equity Method Investments [Line Items]
Equity in earnings	791	869	2,624	3,220
MNI
Schedule of Equity Method Investments [Line Items]
Equity in earnings	404	181	911	991
TNI Partners
Schedule of Equity Method Investments [Line Items]
Operating revenue	7,244	8,229	23,954	25,805
Operating expenses	5,677	6,492	19,041	19,365
Operating income	1,567	1,737	4,913	6,440
Net income	1,581	1,737	5,247	6,440
MNI
Schedule of Equity Method Investments [Line Items]
Operating revenue	10,963	11,921	33,470	35,677
Operating expenses	8,470	9,682	26,496	28,402
Restructuring costs	10	122	137	122
Depreciation and amortization	129	167	402	507
Operating income	2,354	1,950	6,435	6,646
Net income	$ 807	$ 362	$ 1,821	$ 1,982