Net Sales by Major Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 29, 2018		Sep. 30, 2017		Sep. 29, 2018	Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 713,331	[1]	$ 593,043	[1]	$ 1,966,259	$ 1,702,683

[1] Non-operating expenses are not allocated to the operating segments. Non-operating expenses consist of interest expense and deferred financing amortization, foreign exchange gains and losses and other income and expense items outside of income from operations.