Reorganization and Reorganization Costs G&A Realignment Costs - November 2014 Plan (Details) - USD ($) $ in Thousands	3 Months Ended							12 Months Ended
	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
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 - November 2014 Plan
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost										692
Restructuring and Related Cost, Cost Incurred to Date	17,624							17,624
Reorganization and realignment costs								0	$ 0	692
Restructuring Charges, Incurred to Date	23,960							23,960
Employee Severance | G&A Realignment - November 2014 Plan
Restructuring Cost and Reserve
Restructuring Reserve, Accrual Adjustment										(387)
Restructuring and Related Cost, Incurred Cost										(344)
Restructuring and Related Cost, Cost Incurred to Date	14,584							14,584
Recruitment and relocation | G&A Realignment - November 2014 Plan
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost										992
Restructuring and Related Cost, Cost Incurred to Date	2,859							2,859
Other Restructuring | G&A Realignment - November 2014 Plan
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost										44
Restructuring and Related Cost, Cost Incurred to Date	181							181
Share Based Compensation Expense | G&A Realignment - November 2014 Plan
Restructuring Cost and Reserve
Reorganization and realignment costs										$ 0
Restructuring Charges, Incurred to Date	$ 6,336							$ 6,336