Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 29, 2018	Jun. 30, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Taxes [Abstract]
Increase in liabilities for unrecognized tax benefits				$ 3,486
TCJA income tax expense Abstract [Abstract]
TCJA tax on unremitted foreign earnings	$ 6,214					$ 215,558
TCJA foreign taxes on assumed repatriation				19,282		213,000
Expected TCJA tax payment, net	184,468			184,468
Additional expected repatriation	1,200,000					$ 1,100,000
Cash repatriated during the current period	450,000	$ 274,000
Repatriation taxes paid	64,674	92,093
TCJA transition taxes paid		14,400
Future cash repatriation [Abstract]
Future cash repatriation following next fiscal quarter	300,000			300,000
Remeasurement of repatriation deferred tax liability [Member]
Effect on Income Tax Expense (Benefit) [Line Items]
Deferred Other Tax Expense (Benefit)	$ 680		$ 892	$ (7,010)	$ 3,100
Remeasurement of deferred tax liability debt extinguishment [Member]
Effect on Income Tax Expense (Benefit) [Line Items]
Deferred Other Tax Expense (Benefit)		$ (33,963)