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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 |  |

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