Stockholders' Equity (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Cumulative Translation Adjustment Summary [Roll Forward]
Foreign currency translation adjustment, net of tax, beginning of year	$ (176,459)	$ (46,582)	$ (100,923)
Current year change	(23,978)	(123,388)	54,341
Foreign currency translation adjustment, net of tax, end of year	(200,437)	(176,459)	(46,582)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax		0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(6,489)
Other Comprehensive Income (Loss), after Reclassifications, Net of Tax	(23,165)	(123,474)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustments Reclassification From AOCI to Earnings Due to ASU 2018-02	0	6,489	0
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustments Reclassification From AOCI to Earnings, Net of Tax		(6,489)
Unrecognized prior service costs, net of tax	1,052	245	322	$ 399
Unrecognized prior service costs, net of tax, current year change	807	(77)	(77)
Unrealized (losses) gains on securities, net of tax	(261)	(267)	(258)	(337)
Unrealized (losses) gains on securities, net of tax, current year change	6	(9)	79
Other comprehensive (loss) income	(23,165)	(129,963)	54,343
Accumulated other comprehensive income (loss)	$ (199,646)	$ (176,481)	$ (46,518)	$ (100,861)