Restructuring Costs Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 01, 2017 USD ($)	Oct. 02, 2016 USD ($)	Oct. 01, 2017 USD ($)	Oct. 02, 2016 USD ($)	Jan. 01, 2017 employee
Restructuring Cost and Reserve [Line Items]
Restructuring costs, net	$ 1,393	$ 215	$ 986	$ 131
2016 Plan
Restructuring Cost and Reserve [Line Items]
Expected number of positions to be eliminated | employee					140
Restructuring costs, net	1,378		2,152
2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs, net	$ (1)		$ (1,132)