Reorganization and Reorganization Costs Summary (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 – May 2017 Plan
Restructuring Cost and Reserve
Reorganization and realignment costs								8,785	21,663	0
G&A Realignment - November 2014 Plan
Restructuring Cost and Reserve
Reorganization and realignment costs								0	0	692
System Optimization
Restructuring Cost and Reserve
Reorganization and realignment costs								$ 283	$ 911	$ 9,391