Organization, Consolidation, And Basis Of Presentation (Cumulative Effect Of The Changes To Financial Statement) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Inventories	$ 68,128	$ 62,918
Prepaid expenses and other current assets	31,801	30,110
Other current liabilities	113,687	129,396
Retained earnings	$ 315,672	288,070
Scenario, Adjustment [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Inventories		(350)
Prepaid expenses and other current assets		(1,147)
Other current liabilities		(2,491)
Retained earnings		994
Restatement Adjustment [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Inventories		62,568
Prepaid expenses and other current assets		28,963
Other current liabilities		126,905
Retained earnings		$ 289,064