Stockholders' Equity (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Cumulative Translation Adjustment Summary [Roll Forward]
Foreign currency translation adjustment, net of tax, beginning of year	$ (100,923)	$ (46,846)	$ 23,332
Current year change	54,341	(54,077)	(70,178)
Foreign currency translation adjustment, net of tax, end of year	(46,582)	(100,923)	(46,846)
Unrecognized prior service costs, net of tax	322	399	1,259	$ 1,575
Unrecognized prior service costs, net of tax, current year change	(77)	(860)	(316)
Unrealized (losses) gains on securities, net of tax	(258)	(337)	(369)	(107)
Unrealized (losses) gains on securities, net of tax, current year change	79	32	(262)
Other comprehensive income (loss)	54,343	(54,905)	(70,756)
Accumulated other comprehensive income (loss)	$ (46,518)	$ (100,861)	$ (45,956)	$ 24,800