Consolidated Statements of Changes in Shareholders' Equity and Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balances at Jan. 03, 2009	$ 254,939	$ 1,155	$ 617,572		$ (363,255)	$ (533)
Shares, Issued at Jan. 03, 2009		115,469
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(6,957)				(6,957)
Unrealized gain (loss), net, related to marketable securities	1,031					1,031
Tax effect of change in fair market value of auction rate securities	0
Recognized gain on redemption of marketable securities, previously unrealized	(284)					(284)
Translation adjustments	(56)					(56)
Comprehensive Income (Loss)	(6,266)
Common stock issued, Shares, in connection with exercise of stock options, ESPP and net vested RSUs		386
Common stock issued, Value, in connection with exercise of stock options, ESPP and net vested RSUs	202	4	198
Stock repurchase, shares		(263)
Stock repurchase	(329)	(3)		(326)
Retirement of treasury stock			(326)	326
Stock-based compensation	4,576		4,576
Distribution of stock held by deferred stock compensation plan	238		238
Balances at Jan. 02, 2010	253,360	1,156	622,258		(370,212)	158
Shares, Issued at Jan. 02, 2010		115,592
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	57,072				57,072
Unrealized gain (loss), net, related to marketable securities	581					581
Tax effect of change in fair market value of auction rate securities	(304)					(304)
Translation adjustments	64					64
Comprehensive Income (Loss)	57,413
Common stock issued, Shares, in connection with exercise of stock options, ESPP and net vested RSUs		2,750
Common stock issued, Value, in connection with exercise of stock options, ESPP and net vested RSUs	5,368	27	5,341
Stock repurchase, shares		(371)
Stock repurchase	(1,970)	(4)		(1,966)
Retirement of treasury stock			(1,966)	1,966
Stock-based compensation	4,551		4,551
Balances at Jan. 01, 2011	318,722	1,179	630,184		(313,140)	499
Shares, Issued at Jan. 01, 2011		117,971
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	78,232				78,232
Unrealized gain (loss), net, related to marketable securities	(526)					(526)
Tax effect of change in fair market value of auction rate securities	0
Recognized gain on redemption of marketable securities, previously unrealized	(133)					(133)
Translation adjustments	(185)					(185)
Comprehensive Income (Loss)	77,388
Common stock issued, Shares, in connection with exercise of stock options, ESPP and net vested RSUs		2,145
Common stock issued, Value, in connection with exercise of stock options, ESPP and net vested RSUs	5,531	23	5,508
Stock repurchase, shares		(2,441)
Stock repurchase	(14,436)	(25)		(14,411)
Retirement of treasury stock			(14,411)	14,411
Stock-based compensation	6,356		6,356
Balances at Dec. 31, 2011	$ 393,561	$ 1,177	$ 627,637		$ (234,908)	$ (345)
Shares, Issued at Dec. 31, 2011		117,675