Cash And Cash Equivalents And Advertising Accounting Policies (Effect Of Reclassification Of Consolidated Statements Of Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Cost of sales, including advertising, warehousing and distribution expenses	$ 636,736	$ 634,652	$ 1,908,740	$ 1,900,655
Gross profit on sales	232,340	219,609	707,542	682,404
Operating, general and administrative expenses	$ 214,798	213,415	$ 641,124	628,242
As Previously Reported [Member]
Cost of sales, including advertising, warehousing and distribution expenses		631,422		1,890,545
Gross profit on sales		222,839		692,514
Operating, general and administrative expenses		216,645		638,352
Reclassifications [Member]
Cost of sales, including advertising, warehousing and distribution expenses		3,230		10,110
Gross profit on sales		(3,230)		(10,110)
Operating, general and administrative expenses		$ (3,230)		$ (10,110)