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Income Taxes (Details 3) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 30, 2017 | Dec. 31, 2016 | Dec. 26, 2015
Income Tax Disclosure [Abstract] |  |  |
Balance beginning of year | $ 115,090 | $ 97,904 | $ 77,495
Additions based on tax positions related to prior years | 8,564 | 489 | 89
Reductions based on tax positions related to prior years | 983 | (940) | (1,671)
Additions based on tax positions related to current period | 26,295 | 28,859 | 29,019
Reductions related to settlements with tax authorities |  | (134) | (364)
Expiration of statute of limitations | 18,168 | (11,088) | (6,664)
Balance at end of year | $ 130,798 | $ 115,090 | $ 97,904

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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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