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Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	$ 1,476,930	$ 1,421,720
U.S.Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	29,058	19,337
Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	41,745	43,361
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	158,839	174,615
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	892,848	816,793
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	185,585	186,105
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	168,855	181,509
Recurring Basis [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	1,476,930	1,421,720
Recurring Basis [Member] | U.S.Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	29,058	19,337
Recurring Basis [Member] | Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	41,744	43,361
Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	158,839	174,615
Recurring Basis [Member] | Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	892,848	816,793
Recurring Basis [Member] | Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	185,586	186,105
Recurring Basis [Member] | Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	168,855	181,509
Recurring Basis [Member] | Level 1 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total
Recurring Basis [Member] | Level 1 [Member] | U.S.Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total
Recurring Basis [Member] | Level 1 [Member] | Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total
Recurring Basis [Member] | Level 1 [Member] | Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total
Recurring Basis [Member] | Level 1 [Member] | Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total
Recurring Basis [Member] | Level 1 [Member] | Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total
Recurring Basis [Member] | Level 1 [Member] | Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total
Recurring Basis [Member] | Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	1,476,930	1,421,720
Recurring Basis [Member] | Level 2 [Member] | U.S.Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	29,058	19,337
Recurring Basis [Member] | Level 2 [Member] | Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	41,744	43,361
Recurring Basis [Member] | Level 2 [Member] | Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	158,839	174,615
Recurring Basis [Member] | Level 2 [Member] | Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	892,848	816,793
Recurring Basis [Member] | Level 2 [Member] | Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	185,586	186,105
Recurring Basis [Member] | Level 2 [Member] | Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	168,855	181,509
Recurring Basis [Member] | Level 3 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total
Recurring Basis [Member] | Level 3 [Member] | U.S.Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total
Recurring Basis [Member] | Level 3 [Member] | Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total
Recurring Basis [Member] | Level 3 [Member] | Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total
Recurring Basis [Member] | Level 3 [Member] | Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total
Recurring Basis [Member] | Level 3 [Member] | Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total
Recurring Basis [Member] | Level 3 [Member] | Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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- Definition

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+ References

No definition available.

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