Investments and Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified	Jan. 01, 2012	Jan. 02, 2011
Financial assets measured at fair value on a recurring basis
Marketable Securities, Current	$ 1,681,492	$ 2,018,565
Marketable Securities, Noncurrent	2,766,263	2,494,972
Other current assets and other non-current assets	25,594	23,841
Total assets	5,454,454	5,151,076
Financial Liabilities measured at fair value on a recurring basis
Other current accrued liabilities fair value disclosure	40,045	33,606
Non-current liabilities	5,790	43,156
Total financial liabilities	45,835	76,762
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets measured at fair value on a recurring basis
Marketable Securities, Current	155,538	112,906
Marketable Securities, Noncurrent	33,399	8,322
Other current assets and other non-current assets	0	0
Total assets	1,115,931	709,201
Financial Liabilities measured at fair value on a recurring basis
Other current accrued liabilities fair value disclosure	0	0
Non-current liabilities	0	0
Total financial liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Financial assets measured at fair value on a recurring basis
Marketable Securities, Current	1,525,954	1,905,659
Marketable Securities, Noncurrent	2,732,864	2,486,650
Other current assets and other non-current assets	25,594	23,841
Total assets	4,338,523	4,441,875
Financial Liabilities measured at fair value on a recurring basis
Other current accrued liabilities fair value disclosure	40,045	33,606
Non-current liabilities	5,790	43,156
Total financial liabilities	45,835	76,762
Significant Unobservable Inputs (Level 3) [Member]
Financial assets measured at fair value on a recurring basis
Marketable Securities, Current	0	0
Marketable Securities, Noncurrent	0	0
Other current assets and other non-current assets	0	0
Total assets	0	0
Financial Liabilities measured at fair value on a recurring basis
Other current accrued liabilities fair value disclosure	0	0
Non-current liabilities	0	0
Total financial liabilities	0	0
Cash Equivalents [Member]
Financial assets measured at fair value on a recurring basis
Cash equivalents	981,105	613,698
Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets measured at fair value on a recurring basis
Cash equivalents	926,994	587,973
Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets measured at fair value on a recurring basis
Cash equivalents	54,111	25,725
Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets measured at fair value on a recurring basis
Cash equivalents	$ 0	$ 0