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Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	$ 1,421,720	$ 1,480,237
U.S.Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	19,337	29,034
Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	43,361	59,541
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	174,615	230,823
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	816,793	893,725
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	186,105	176,169
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	181,509	90,945
Recurring Basis [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	1,421,720	1,480,237
Recurring Basis [Member] | U.S.Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	19,337	29,034
Recurring Basis [Member] | Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	43,361	59,541
Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	174,615	230,823
Recurring Basis [Member] | Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	816,793	893,725
Recurring Basis [Member] | Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	186,105	176,168
Recurring Basis [Member] | Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	181,509	90,946
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	1,421,720	1,480,237
Recurring Basis [Member] | Level 2 [Member] | U.S.Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	19,337	29,034
Recurring Basis [Member] | Level 2 [Member] | Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	43,361	59,541
Recurring Basis [Member] | Level 2 [Member] | Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	174,615	230,823
Recurring Basis [Member] | Level 2 [Member] | Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	816,793	893,725
Recurring Basis [Member] | Level 2 [Member] | Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	186,105	176,168
Recurring Basis [Member] | Level 2 [Member] | Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, total	181,509	90,946
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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