Value Creation Plan (Disclosure of costs incurred since the inception of the Value Creation Plan) (Details) - Value Creation Plan [Member] - USD ($) $ in Thousands	12 Months Ended			39 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017	Dec. 28, 2019	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense	$ 9,649	$ 2,374	$ 49,912	$ 80,261
Cash payments, net	(10,466)	(3,933)	(38,614)	(56,091)
Non-cash adjustments	4,131	1,255	(11,031)	(19,943)
Balance payable, December 28, 2019	4,227	913	3,727	4,227	$ 3,460
Asset impairments and facility closure costs [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense	308	1,364	21,766	34,960
Cash payments, net	(584)	1,068	(10,746)	(10,262)
Non-cash adjustments	0	(1,255)	(11,720)	24,497
Balance payable, December 28, 2019	201	477	(700)	201	0
Employee recruitment, retention and termination costs [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense	7,988	600	11,618	22,969
Cash payments, net	(8,529)	(4,591)	(9,683)	(23,497)
Non-cash adjustments	4,131	0	689	4,554
Balance payable, December 28, 2019	4,026	436	4,427	4,026	1,803
Consulting fees and temporary labor costs [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense	1,353	410	16,528	22,332
Cash payments, net	(1,353)	(410)	(18,185)	(22,332)
Non-cash adjustments	0	0	0	0
Balance payable, December 28, 2019	$ 0	$ 0	$ 0	$ 0	$ 1,657