Significant Accounting Policies (Schedule of consolidated statements of cash flows) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Oct. 01, 2022	Jul. 02, 2022	Apr. 02, 2022	Jan. 01, 2022	Oct. 02, 2021	Jul. 03, 2021	Apr. 03, 2021	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Consolidated Statements of Cash Flows
Earnings (loss) from continuing operations	$ (871)	$ (11,934)	$ 2,285	$ 1,002	$ (6,078)	$ (2,909)	$ 5,531	$ 2,284	$ (9,518)	$ (1,172)	$ (42,392)
Items not affecting cash:
Deferred income taxes	(3,188)	(3,630)	2,341	(178)	1,380	3,190	(10,780)	225	(4,655)	(5,985)	2,643
Changes in operating assets and liabilities	$ 15,854	2,003	(22,452)	3,191	13,807	(5,494)	(50,322)	(21,656)	(1,404)	(63,665)	17,131
Net cash provided by (used in) operating activities of continuing operations									$ 60,575	(21,432)	52,663
As Previously Reported [Member]
Consolidated Statements of Cash Flows
Earnings (loss) from continuing operations		(12,639)	2,498	654	(1,864)	(3,034)	(918)	1,672		(4,144)	(47,302)
Items not affecting cash:
Deferred income taxes		(2,925)	2,128	80	(2,744)	3,315	(4,331)	837		(2,923)	7,553
Changes in operating assets and liabilities		2,003	(22,452)	3,281	13,717	(5,494)	(50,322)	(21,656)		(63,755)	17,131
Net cash provided by (used in) operating activities of continuing operations										(21,432)	52,663
Adjustment [Member]
Consolidated Statements of Cash Flows
Earnings (loss) from continuing operations		705	(213)	348	(4,214)	125	6,449	612		2,972	4,910
Items not affecting cash:
Deferred income taxes		(705)	213	(258)	4,124	(125)	(6,449)	(612)		(3,062)	(4,910)
Changes in operating assets and liabilities		$ 0	$ 0	$ (90)	$ 90	$ 0	$ 0	$ 0		90	0
Net cash provided by (used in) operating activities of continuing operations										$ 0	$ 0