Investments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010	Jan. 03, 2009
Classified as Cash and cash equivalents:
Cash and interest bearing deposits, Cost	$ 117,500	$ 93,728
Cash equivalents - Money market funds, Cost	484,102	463,681
Total Cash and cash equivalents, Cost	601,602	557,409	569,115	568,255
Cash and interest bearing deposits, Gross Unrealized Gains	0	0
Cash equivalents - Money market funds, Gross Unrealized Gains	0	0
Total Cash and Cash Equivalents ,Gross Unrealized Gains	0	0
Cash and interest bearing deposits, Gross Unrealized Losses	0	0
Cash equivalents - Money market funds, Gross Unrealized Losses	0	0
Total Cash and cash equivalents, Gross Unrealized Losses	0	0
Cash and interest bearing deposits, fair value	117,500	93,728
Cash equivalents - Money market funds, fair value	484,102	463,681
Total Cash and cash equivalents, fair value	601,602	557,409
Classified as Short-term investments:
Available-for-sale securities , cost	1,830	3,262
Available-for-sale securities , Gross Unrealized Gains	1,207	9,453
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale securities, Fair Value	$ 3,037	$ 12,715