Consolidated Statement of Shareholders' Equity - 6 months ended Jul. 04, 2015 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Jan. 03, 2015	$ 256,907	$ 528	$ 0	$ 256,413	$ (34)
Balance (in shares) at Jan. 03, 2015	52,798,000	52,798,000
Net income	$ 39,837	$ 0	0	39,837	0
Other comprehensive income:
Unrealized gain on available-for-sale marketable debt securities, net of tax	52	0	0	0	52
Exercise of common stock options	2,458	$ 2	2,456	0	0
Exercise of common stock options (in shares)		198,000
Tax effect from stock-based compensation	1,939	$ 0	1,939	0	0
Stock-based compensation (in shares)		52,000
Stock-based compensation	5,828	$ 1	5,827	0	0
Repurchases of common stock	(51,629)	$ (17)	(10,222)	(41,390)	0
Repurchases of common stock (in shares)		(1,634,000)
Balance at Jul. 04, 2015	$ 255,392	$ 514	$ 0	$ 254,860	$ 18
Balance (in shares) at Jul. 04, 2015	51,414,000	51,414,000