Value Creation Plan (Disclosure of costs incurred under 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
Restructuring Reserve [Roll Forward]
Balance payable (receivable), beginning of year	$ 913	$ 3,727	$ 3,460
Costs incurred and charged to expense	9,649	2,374	49,912	$ 80,261
Cash receipts (payments), net	(10,466)	(3,933)	(38,614)	(56,091)
Non-cash adjustments	4,131	1,255	(11,031)	(19,943)
Balance payable (receivable), end of year	4,227	913	3,727	4,227
Asset impairments and facility closure costs [Member]
Restructuring Reserve [Roll Forward]
Balance payable (receivable), beginning of year	477	(700)	0
Costs incurred and charged to expense	308	1,364	21,766	34,960
Cash receipts (payments), net	(584)	1,068	(10,746)	(10,262)
Non-cash adjustments	0	(1,255)	(11,720)	24,497
Balance payable (receivable), end of year	201	477	(700)	201
Employee recruitment, retention and termination costs [Member]
Restructuring Reserve [Roll Forward]
Balance payable (receivable), beginning of year	436	4,427	1,803
Costs incurred and charged to expense	7,988	600	11,618	22,969
Cash receipts (payments), net	(8,529)	(4,591)	(9,683)	(23,497)
Non-cash adjustments	4,131	0	689	4,554
Balance payable (receivable), end of year	4,026	436	4,427	4,026
Consulting fees and temporary labor costs [Member]
Restructuring Reserve [Roll Forward]
Balance payable (receivable), beginning of year	0	0	1,657
Costs incurred and charged to expense	1,353	410	16,528	22,332
Cash receipts (payments), net	(1,353)	(410)	(18,185)	(22,332)
Non-cash adjustments	0	0	0	0
Balance payable (receivable), end of year	$ 0	$ 0	$ 0	$ 0