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. 28, 2013	$ 225,220	$ 549	$ 5,382	$ 219,276	$ 13
Balance (in shares) at Dec. 28, 2013	54,901	54,901
Net income	16,992	0	0	16,992	0
Other comprehensive income:
Unrealized gain on available-for-sale marketable debt securities, net of tax	10	0	0	0	10
Exercise of common stock options	411	0	411	0	0
Exercise of common stock options (in shares)		32
Tax effect from stock-based compensation	(166)	0	(166)	0	0
Stock-based compensation	(108)	0	(108)	0	0
Stock-based compensation (in shares)		(80)
Repurchases of common stock	(10,236)	(6)	(5,519)	(4,711)	0
Repurchases of common stock (in shares)		(580)
Balance at Mar. 29, 2014	$ 232,123	$ 543	$ 0	$ 231,557	$ 23
Balance (in shares) at Mar. 29, 2014	54,273	54,273