Revenue Recognition (Details 1) - USD ($) $ in Thousands	Jun. 28, 2018	Dec. 29, 2017	Dec. 28, 2017
Refundable income taxes	$ 3,400		$ 15,335
Other accrued liabilities	49,272		53,291
Deferred compensation and other	59,285		56,662
Retained earnings	420,910		$ 403,206
Accounting Standards Update 2014-09 [Member]
Refundable income taxes		$ 16,280
Other accrued liabilities		56,587
Deferred compensation and other		56,879
Retained earnings		400,638
Restatement Adjustment [Member]
Refundable income taxes	945	945
Other accrued liabilities	3,572	3,296
Deferred compensation and other	99	217
Retained earnings	$ (2,726)	$ (2,568)