Restructuring Costs and Other Income - Changes in Accrued Restructuring (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Jan. 02, 2016
Restructuring Reserve [Roll Forward]
Provision		$ 515
Restructuring Plan 2015
Restructuring Reserve [Roll Forward]
Provision		344
Restructuring Plan 2014
Restructuring Reserve [Roll Forward]
Provision		171
Severance Costs | Restructuring Plan 2017
Restructuring Reserve [Roll Forward]
Provision	$ 203
Balance at end of period	$ 203
Severance Costs | Restructuring Plan 2015
Restructuring Reserve [Roll Forward]
Provision		344
Usage		(323)
Currency translation		(21)
Balance at end of period		0
Severance Costs | Restructuring Plan 2014
Restructuring Reserve [Roll Forward]
Balance at beginning of period		47
Provision		171
Usage		(214)
Currency translation		(4)
Balance at end of period		$ 0