Summary Of Significant Accounting Policies (Schedule Of Movement Of Warranty Reserves) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014
Accounting Policies [Abstract]
Balance at beginning of year	$ 4,379	$ 4,521
Accruals for warranties issued	2,459	4,044
Settlements made	(3,205)	(3,867)
Foreign currency translation adjustment	(223)	(319)
Balance at end of period	$ 3,410	$ 4,379