Changes in Stockholders' Equity and Accumulated Other Comprehensive Loss (Details) (USD $)	3 Months Ended		1 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended				3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Feb. 27, 2013 Share Repurchase Program approved on Feb 27, 2013	Dec. 28, 2013 Share Repurchase Program approved on Feb 27, 2013	Mar. 03, 2014 Share Repurchase Program approved on Feb 27, 2014	Mar. 29, 2014 Common stock	Mar. 29, 2014 Paid-in capital	Mar. 29, 2014 Accumulated deficit	Dec. 28, 2013 Accumulated deficit	Mar. 29, 2014 Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 385,680,000					$ 1,157,000	$ 626,861,000	$ (230,209,000)	$ (242,193,000)	$ (145,000)
Net Income for the period	11,984,000	1,890,000
Unrealized loss related to marketable securities, net	(51,000)									(51,000)
Redemption Premium	(9,000)									(9,000)
Translation adjustments	(176,000)	(165,000)								(176,000)
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs (net of taxes)	4,225,000					16,000	4,209,000
Stock-based compensation expense related to stock options, ESPP and RSUs	3,090,000						3,090,000
Ending balance	404,743,000					1,173,000	634,160,000	(230,209,000)	(242,193,000)	(381,000)
Stock repurchase program, authorized amount			20,000,000.0		20,000,000.0
Shares repurchased (in shares)	0			800,000
Shares repurchased				$ 3,700,000