Significant Accounting Policies (Schedule of consolidated statements of cash flows) (Details) - USD ($) $ in Thousands	3 Months Ended							6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Jun. 29, 2024	Jul. 01, 2023	Sep. 28, 2024	Sep. 30, 2023	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Consolidated Statements of Cash Flows
Net loss												$ (17,393)	$ (178,789)	$ (6,433)
Net loss from discontinued operations	$ 0	$ (897)	$ (917)	$ (10,482)	$ (140,143)	$ (7,187)	$ 4,204	$ (1,814)	$ (2,983)	$ (1,814)	$ (143,126)	(5,919)	(153,608)	(8,722)
Earnings (loss) from continuing operations												(11,474)	(25,181)	2,289
Items not affecting cash:
Stock-based compensation												11,190	12,432	13,830
Changes in operating assets and liabilities, net of divestitures												17,711	(22,382)	(13,550)
Net cash provided by operating activities of continuing operations												52,339	3,575	30,746
Net cash provided by operating activities of discontinued operations												(2,310)	11,269	29,829
Net cash provided by operating activities												$ 50,029	14,844	60,575
As Previously Reported [Member]
Consolidated Statements of Cash Flows
Net loss													(175,018)	(4,841)
Net loss from discontinued operations	0	(897)	(1,417)	(9,982)	(140,143)	(7,187)	4,204	(2,314)	(2,983)	(2,314)	(143,126)		(153,108)	(8,722)
Earnings (loss) from continuing operations													(21,910)	3,881
Items not affecting cash:
Stock-based compensation													11,778	13,830
Changes in operating assets and liabilities, net of divestitures													(24,999)	(15,142)
Net cash provided by operating activities of continuing operations													3,575	30,746
Net cash provided by operating activities of discontinued operations													11,269	29,829
Net cash provided by operating activities													14,844	60,575
Adjustments [Member]
Consolidated Statements of Cash Flows
Net loss													(3,771)	(1,592)
Net loss from discontinued operations	$ 0	$ 0	$ 500	$ (500)	$ 0	$ 0	$ 0	$ 500	$ 0	$ 500	$ 0		(500)	0
Earnings (loss) from continuing operations													(3,271)	(1,592)
Items not affecting cash:
Stock-based compensation													654	0
Changes in operating assets and liabilities, net of divestitures													2,617	1,592
Net cash provided by operating activities of continuing operations													0	0
Net cash provided by operating activities of discontinued operations													0	0
Net cash provided by operating activities													$ 0	$ 0