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Marketable Securities (Details 2) - USD ($) $ in Thousands	12 Months Ended
	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

X

- 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

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+ 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

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+ References

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-Publisher FASB
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+ References

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