Balance Sheet Items (Schedule Of Inventory) (Details) (USD $)	Sep. 27, 2014	Dec. 28, 2013
Balance Sheet Items [Abstract]
Work-in-progress	$ 17,865,000	$ 15,847,000
Finished goods	16,723,000	15,227,000
Inventory, net	34,588,000	31,074,000
Inventory reserves	$ 7,300,000	$ 6,600,000