Condensed Consolidated Statement of Shareholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Jan. 01, 2011	$ 57,977	$ 555	$ 36,799	$ 20,623	$ 0
Balance (in shares) at Jan. 01, 2011	55,455	55,455
Comprehensive income:
Net income	27,872	0	0	27,872	0
Unrealized loss on available-for-sale marketable debt securities	(27)	0	0	0	(27)
Total comprehensive income	27,845
Exercise of common stock options	870	3	867	0	0
Exercise of common stock options (in shares)		297
Tax effect from stock-based compensation	958	0	958	0	0
Stock-based compensation	2,256	2	2,254	0	0
Stock-based compensation (in shares)		222
Repurchases of common stock	(309)	0	(309)	0	0
Repurchases of common stock (in shares)		(26)
Other	90		90	0	0
Other (in shares)		43
Balance at Jul. 02, 2011	$ 89,687	$ 560	$ 40,659	$ 48,495	$ (27)
Balance (in shares) at Jul. 02, 2011	55,991	55,991