Consolidated Statement of Shareholders' Equity - 3 months ended Apr. 02, 2016 - USD ($) shares in Thousands, $ 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	49,402
Balance at Jan. 02, 2016	$ 222,339	$ 494	$ 0	$ 221,859	$ (14)
Net income	12,969	0	0		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)		0
Exercise of common stock options	6	$ 0	6	0	0
Tax effect from stock-based compensation	(670)	$ 0	(670)	0	0
Stock-based compensation (in shares)		(12)
Stock-based compensation	3,766	$ 0	3,766	0	0
Repurchases of common stock (in shares)		(2,704)
Repurchases of common stock	$ (51,240)	$ (27)	$ (3,102)	$ (48,111)	$ 0
Balance (in shares) at Apr. 02, 2016	46,686
Balance at Apr. 02, 2016	$ 187,184