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Marketable Securities (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 30, 2017 | Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | $ (8,590) | $ (26,602)
Fair Value Less than 12 Consecutive Months | 749,831 | 1,133,944
Gross Unrealized Losses 12 Consecutive Months or Longer | (16,380) | (3,672)
Fair Value 12 Consecutive Months or Longer | 573,976 | 118,800
U.S.Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (111) | (288)
Fair Value Less than 12 Consecutive Months | 12,966 | 24,260
Gross Unrealized Losses 12 Consecutive Months or Longer | (143) |
Fair Value 12 Consecutive Months or Longer | 6,371 |
Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (168) | (991)
Fair Value Less than 12 Consecutive Months | 16,097 | 49,255
Gross Unrealized Losses 12 Consecutive Months or Longer | (663) |
Fair Value 12 Consecutive Months or Longer | 25,972 |
Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (503) | (3,702)
Fair Value Less than 12 Consecutive Months | 19,628 | 159,665
Gross Unrealized Losses 12 Consecutive Months or Longer | (5,365) | (1,870)
Fair Value 12 Consecutive Months or Longer | 153,835 | 64,645
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (4,562) | (18,856)
Fair Value Less than 12 Consecutive Months | 439,174 | 765,712
Gross Unrealized Losses 12 Consecutive Months or Longer | (9,228) | (1,699)
Fair Value 12 Consecutive Months or Longer | 347,052 | 40,910
Municipal Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (1,027) | (2,762)
Fair Value Less than 12 Consecutive Months | 125,819 | 130,994
Gross Unrealized Losses 12 Consecutive Months or Longer | (977) | (97)
Fair Value 12 Consecutive Months or Longer | 38,167 | 6,326
Other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (2,219) | (3)
Fair Value Less than 12 Consecutive Months | 136,147 | 4,058
Gross Unrealized Losses 12 Consecutive Months or Longer | (4) | (6)
Fair Value 12 Consecutive Months or Longer | $ 2,579 | $ 6,919

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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