Other expense (income) expense, net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Other Nonoperating Income (Expense) [Abstract]
Foreign currency losses (income), net	$ 5,008	$ (1,665)	$ 2,685	$ 3,377
All other, net	(2,006)	(4,142)	(2,515)	(5,755)
Total other expense (income), net	$ 3,002	$ (5,807)	$ 170	$ (2,378)