Cash And Cash Equivalents And Advertising Accounting Policies (Effect Of Reclassification Of Consolidated Statements Of Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Cost of sales, including advertising, warehousing and distribution expenses	$ 630,805	$ 642,811	$ 1,272,004	$ 1,266,004
Gross profit on sales	240,295	233,758	475,202	462,794
Operating, general and administrative expenses	$ 214,258	206,040	$ 426,326	414,826
As Previously Reported [Member]
Cost of sales, including advertising, warehousing and distribution expenses		636,690		1,259,123
Gross profit on sales		239,879		469,675
Operating, general and administrative expenses		212,161		421,707
Reclassifications [Member]
Cost of sales, including advertising, warehousing and distribution expenses		6,121		6,881
Gross profit on sales		(6,121)		(6,881)
Operating, general and administrative expenses		$ (6,121)		$ (6,881)