Investments and Fair Value Measurements-Cash and Mkt Securities (Details 1) - USD ($) $ in Thousands	Jun. 28, 2015	Dec. 28, 2014	Jun. 29, 2014	Dec. 29, 2013
Cash, Cash Equivalents and Marketable Securities [Abstract]
Cash and Cash Equivalents	$ 685,790	$ 809,003	$ 885,115	$ 986,246
Short-term marketable securities	1,078,221	1,455,509
Long-term marketable securities	2,239,072	2,758,475
Total cash, cash equivalents and marketable securities	$ 4,003,083	$ 5,022,987