Investments and Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Jan. 01, 2012
Financial assets measured at fair value on a recurring basis
Marketable Securities, Current	$ 1,575,339	$ 1,681,492
Marketable Securities, Noncurrent	2,803,622	2,766,263
Other current assets and other non-current assets	13,226	25,594
Total assets	5,238,278	5,454,454
Financial Liabilities measured at fair value on a recurring basis
Other current accrued liabilities fair value disclosure	102,003	40,045
Non-current liabilities	1,039	5,790
Total financial liabilities	103,042	45,835
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets measured at fair value on a recurring basis
Marketable Securities, Current	61,584	155,538
Marketable Securities, Noncurrent	3,470	33,399
Other current assets and other non-current assets	0	0
Total assets	767,645	1,115,931
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	1,513,755	1,525,954
Marketable Securities, Noncurrent	2,800,152	2,732,864
Other current assets and other non-current assets	13,226	25,594
Total assets	4,470,633	4,338,523
Financial Liabilities measured at fair value on a recurring basis
Other current accrued liabilities fair value disclosure	102,003	40,045
Non-current liabilities	1,039	5,790
Total financial liabilities	103,042	45,835
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	846,091	981,105
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	702,591	926,994
Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets measured at fair value on a recurring basis
Cash equivalents	143,500	54,111
Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets measured at fair value on a recurring basis
Cash equivalents	$ 0	$ 0