Cash and Cash Equivalents and Advertising Accounting Policies, and Prior Year Reclassifications (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Cash and Cash Equivalents [Line Items]
Cash and cash equivalent	$ 37,808	$ 47,917	$ 46,818	$ 52,278
Accounts receivable, net	57,285	56,265
Advertising Expense	30,500	31,000	26,300
Cost of sales, including advertising, warehousing and distribution expenses	2,574,269	2,554,284	2,273,182
Credit Card Receivable [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalent	23,600	26,600
Reclassifications [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalent		26,612	32,165	$ 34,682
Accounts receivable, net		(26,612)
Advertising Expense	$ 11,100	13,900	8,600
Cost of sales, including advertising, warehousing and distribution expenses		$ 13,936	$ 8,617