Consolidated Statement of Shareholders' Equity - 6 months ended Jul. 02, 2016 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance (in shares) at Jan. 02, 2016	49,402,000	49,402,000
Balance at Jan. 02, 2016	$ 222,339	$ 494	$ 0	$ 221,859	$ (14)
Net income	14,385	0	0	14,385	0
Other comprehensive income:
Unrealized gain on available-for-sale marketable debt securities, net of tax	14	$ 0	0	0	14
Exercise of common stock options (in shares)		148,000
Exercise of common stock options	1,623	$ 1	1,622	0	0
Tax effect from stock-based compensation	(794)	$ 0	(794)	0	0
Stock-based compensation (in shares)		5,000
Stock-based compensation	7,606	$ 0	7,606	0	0
Repurchases of common stock (in shares)		(3,626,000)
Repurchases of common stock	$ (71,366)	$ (36)	(8,434)	(62,896)	0
Balance (in shares) at Jul. 02, 2016	45,929,000	45,929,000
Balance at Jul. 02, 2016	$ 173,807	$ 459	$ 0	$ 173,348	$ 0