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Marketable Securities (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 1,446,428 | $ 1,509,924
Gross Unrealized Gains | 262 | 587
Gross Unrealized Losses | (24,970) | (30,274)
Fair Value | 1,421,720 | 1,480,237
U.S.Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 19,591 | 29,291
Gross Unrealized Gains |  | 31
Gross Unrealized Losses | (254) | (288)
Fair Value | 19,337 | 29,034
Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 44,191 | 60,513
Gross Unrealized Gains | 1 | 19
Gross Unrealized Losses | (831) | (991)
Fair Value | 43,361 | 59,541
Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 180,470 | 236,354
Gross Unrealized Gains | 13 | 41
Gross Unrealized Losses | (5,868) | (5,572)
Fair Value | 174,615 | 230,823
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 830,447 | 914,028
Gross Unrealized Gains | 136 | 252
Gross Unrealized Losses | (13,790) | (20,555)
Fair Value | 816,793 | 893,725
Municipal Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 187,999 | 178,804
Gross Unrealized Gains | 110 | 224
Gross Unrealized Losses | (2,004) | (2,859)
Fair Value | 186,105 | 176,169
Other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 183,730 | 90,934
Gross Unrealized Gains | 2 | 20
Gross Unrealized Losses | (2,223) | (9)
Fair Value | $ 181,509 | $ 90,945

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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