Restructuring and Impairment Charges (Schedule of Restructuring Reserve by Type of Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Restructuring Reserve [Roll Forward]
Restructuring reserve at beginning of period	$ 286	$ 1,859	$ 2,704
Restructuring charges	2,371	2,325	6,205
Cash payments	(1,723)	(3,898)	(7,050)
Restructuring reserve at end of period	934	286	1,859
Severance Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve at beginning of period	136	1,343	2,704
Restructuring charges	1,977	355	1,436
Cash payments	(1,451)	(1,562)	(2,797)
Restructuring reserve at end of period	662	136	1,343
Facility Exit Costs & Other
Restructuring Reserve [Roll Forward]
Restructuring reserve at beginning of period	150	516	0
Restructuring charges	394	1,970	4,769
Cash payments	(272)	(2,336)	(4,253)
Restructuring reserve at end of period	$ 272	$ 150	$ 516