Cash and Cash Equivalents and Advertising Accounting Policies, and Prior Year Reclassifications (Effect Of Reclassification Of Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Cash and cash equivalent	$ 37,808	$ 47,917	$ 46,818	$ 52,278
Accounts receivable, net	$ 57,285	56,265
As Previously Reported [Member]
Cash and cash equivalent		21,305	14,653	17,596
Accounts receivable, net		82,877
Reclassifications [Member]
Cash and cash equivalent		26,612	$ 32,165	$ 34,682
Accounts receivable, net		$ (26,612)