Reorganization and Reorganization Costs G&A Realignment Accrual Rollforward - May 2017 Plan (Details) - G&A Realignment – May 2017 Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017
Restructuring Cost and Reserve
Beginning balance	$ 12,270	$ 0
Charges	5,893	16,536
Payments	(10,839)	(4,266)
Ending balance	7,324	12,270
Employee Severance
Restructuring Cost and Reserve
Beginning balance	12,093	0
Charges	3,797	14,956
Payments	(8,649)	(2,863)
Ending balance	7,241	12,093
Recruitment and relocation
Restructuring Cost and Reserve
Beginning balance	177	0
Charges	1,077	489
Payments	(1,171)	(312)
Ending balance	83	177
Other Restructuring
Restructuring Cost and Reserve
Beginning balance	0	0
Charges	1,019	1,091
Payments	(1,019)	(1,091)
Ending balance	0	0
Accrued Liabilities
Restructuring Cost and Reserve
Beginning balance	8,467
Ending balance	6,280	8,467
Other liabilities
Restructuring Cost and Reserve
Beginning balance	3,803
Ending balance	$ 1,044	$ 3,803