Reorganization and Reorganization Costs G&A Realignment Costs - May 2017 Plan (Details) $ in Thousands	3 Months Ended							12 Months Ended
	Dec. 30, 2018 USD ($) Pension_Plans	Sep. 30, 2018 USD ($)	Jul. 01, 2018 USD ($)	Apr. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)	Oct. 01, 2017 USD ($)	Jul. 02, 2017 USD ($)	Dec. 30, 2018 USD ($) Pension_Plans	Dec. 31, 2017 USD ($)	Jan. 01, 2017 USD ($)
Restructuring Cost and Reserve
Reorganization and realignment costs	$ 2,377	$ 941	$ 3,124	$ 2,626	$ 1,806	$ 2,888	$ 17,699	$ 9,068	$ 22,574	$ 10,083
G&A Realignment – May 2017 Plan
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost								5,893	16,536
Restructuring Charges, Incurred to Date	30,448							30,448
Restructuring and Related Cost, Cost Incurred to Date	22,429							22,429
Reorganization and realignment costs								8,785	21,663	$ 0
Restructuring and Related Cost, Expected Cost Remaining	4,500							4,500
Employee Severance | G&A Realignment – May 2017 Plan
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost								3,797	14,956
Restructuring and Related Cost, Cost Incurred to Date	18,753							18,753
Restructuring and Related Cost, Expected Cost Remaining	1,000							1,000
Recruitment and relocation | G&A Realignment – May 2017 Plan
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost								1,077	489
Restructuring and Related Cost, Cost Incurred to Date	1,566							1,566
Restructuring and Related Cost, Expected Cost Remaining	1,500							1,500
Other Restructuring | G&A Realignment – May 2017 Plan
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost								1,019	1,091
Restructuring and Related Cost, Cost Incurred to Date	2,110							2,110
Restructuring and Related Cost, Expected Cost Remaining	500							500
Share Based Compensation Expense | G&A Realignment – May 2017 Plan
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost								1,557	5,127
Restructuring Charges, Incurred to Date	6,684							6,684
Restructuring and Related Cost, Expected Cost Remaining	1,500							1,500
Termination of defined benefit plans | G&A Realignment – May 2017 Plan
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost								1,335	$ 0
Restructuring Charges, Incurred to Date	1,335							1,335
Minimum | G&A Realignment – May 2017 Plan
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	32,000							32,000
Maximum | G&A Realignment – May 2017 Plan
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	$ 35,000							$ 35,000
Pension Plans, Defined Benefit
Restructuring Cost and Reserve
Defined Benefit Plans, Number of Plans | Pension_Plans	2							2