Reorganization and Realignment Costs Summary (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Restructuring Cost and Reserve
Reorganization and realignment costs	$ 2,888	$ 2,129	$ 20,768	$ 7,866
System Optimization
Restructuring Cost and Reserve
Reorganization and realignment costs	232	2,091	867	6,895
G&A Realignment – November 2014 Plan
Restructuring Cost and Reserve
Reorganization and realignment costs	0	38	0	971
G&A Realignment – May 2017 Plan
Restructuring Cost and Reserve
Reorganization and realignment costs	$ 2,656	$ 0	$ 19,901	$ 0