Accounting Pronouncements Adopted and Critical Accounting Policies and Estimates - The cumulative effect of the changes made to our consolidated balance sheet (Details) - USD ($) $ in Thousands	Sep. 29, 2018	Dec. 31, 2017	Dec. 30, 2017
Assets [Abstract]
Prepaid expenses and other	$ 513,717	$ 454,261	$ 454,752
Investments and other	518,425	433,135	432,002
Liabilities [Abstract]
Accrued Expenses - Taxes	180,163	189,310	188,873
Accrued Expenses - Other	496,959	453,166	455,780
Deferred income taxes	45,947	50,902	50,431
Other Liabilities (Long term)	415,045	420,039	420,285
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings	$ 3,191,260	2,942,623	$ 2,940,029
Adjustments Due To Topic 606 [Member]
Assets [Abstract]
Prepaid expenses and other		119
Investments and other		1,133
Liabilities [Abstract]
Accrued Expenses - Taxes		437
Accrued Expenses - Other		(2,614)
Deferred income taxes		471
Other Liabilities (Long term)		(246)
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings		3,204
Adjustments Due To Topic 740 [Member]
Assets [Abstract]
Prepaid expenses and other		(610)
Investments and other		0
Liabilities [Abstract]
Accrued Expenses - Taxes		0
Accrued Expenses - Other		0
Deferred income taxes		0
Other Liabilities (Long term)		0
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings		$ (610)

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