Consolidated Statement of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 29, 2012	$ (193,697)	$ (559)	$ (33,923)	$ (159,195)	$ (20)
Balance (in shares) at Dec. 29, 2012	55,903	55,903
Net income	33,397	0	0	33,397	0
Other comprehensive loss:
Unrealized loss on available-for-sale marketable debt securities, net of tax	(45)	0	0	0	(45)
Exercise of common stock options	6,595	5	6,590	0	0
Exercise of common stock options (in shares)		542
Tax effect from stock-based compensation	484	0	484	0	0
Stock-based compensation	1,992	2	1,990	0	0
Stock-based compensation (in shares)		178
Repurchases of common stock	(22,031)	(10)	(22,021)	0	0
Repurchases of common stock (in shares)		(1,020)
Balance at Jun. 29, 2013	$ (214,089)	$ (556)	$ (20,966)	$ (192,592)	$ (25)
Balance (in shares) at Jun. 29, 2013	55,603	55,603