Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Comprehensive Income
Balance at Jan. 03, 2009	$ 502,460	$ 4	$ 75,711	$ 432,793	$ (6,048)
Balance (in shares) at Jan. 03, 2009		44,613
Comprehensive income:
Net income	73,092			73,092		73,092
Unrealized gains on available-for-sale securities, net of tax of $(1), $(143) and $(522) for the year ended 2011, 2010 and 2009, respectively	969				969	969
Unrealized gains on cash flow hedges, net of tax of $(635), $(238) and $(389) for the year ended 2011, 2010 and 2009, respectively	723				723	723
Total comprehensive income	74,784					74,784
Stock issuances under employee plans, net of shares withheld for taxes	25,187	1	25,186
Stock issuances under employee plans, net of shares withheld for taxes (in shares)		1,669
Income tax benefit from employee stock-based awards	3,890		3,890
Repurchases of common stock	(20,181)		(20,181)
Repurchases of common stock (in shares)	(600)	(633)
Stock-based compensation	43,656		43,656
Stock-based compensation (in shares)		123
Balance at Jan. 02, 2010	629,796	5	128,262	505,885	(4,356)
Balance (in shares) at Jan. 02, 2010		45,772
Comprehensive income:
Net income	73,242			73,242		73,242
Unrealized gains on available-for-sale securities, net of tax of $(1), $(143) and $(522) for the year ended 2011, 2010 and 2009, respectively	266				266	266
Unrealized gains on cash flow hedges, net of tax of $(635), $(238) and $(389) for the year ended 2011, 2010 and 2009, respectively	442				442	442
Total comprehensive income	73,950					73,950
Stock issuances under employee plans, net of shares withheld for taxes	18,055		18,055
Stock issuances under employee plans, net of shares withheld for taxes (in shares)		1,453
Income tax benefit from employee stock-based awards	3,277		3,277
Repurchases of common stock	(140,332)	(1)	(140,331)
Repurchases of common stock (in shares)	(3,300)	(3,292)
Stock-based compensation	40,684		40,684
Balance at Jan. 01, 2011	625,430	4	49,947	579,127	(3,648)
Balance (in shares) at Jan. 01, 2011	43,933	43,933
Comprehensive income:
Net income	35,472			35,472		35,472
Unrealized gains on available-for-sale securities, net of tax of $(1), $(143) and $(522) for the year ended 2011, 2010 and 2009, respectively	3				3	3
Unrealized gains on cash flow hedges, net of tax of $(635), $(238) and $(389) for the year ended 2011, 2010 and 2009, respectively	1,178				1,178	1,178
Total comprehensive income	36,653
Stock issuances under employee plans, net of shares withheld for taxes	7,660		7,660
Stock issuances under employee plans, net of shares withheld for taxes (in shares)	1,300	1,290
Income tax benefit from employee stock-based awards	2,707		2,707
Repurchases of common stock	(110,063)		(82,117)	(27,946)
Repurchases of common stock (in shares)	(3,200)	(3,155)
Stock-based compensation	36,552		36,552
Balance at Dec. 31, 2011	$ 598,939	$ 4	$ 14,749	$ 586,653	$ (2,467)
Balance (in shares) at Dec. 31, 2011	42,068	42,068