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Employee Benefit Plans (Assumptions) (Details) | 12 Months Ended
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Dec. 26, 2018 | Dec. 27, 2017 | Dec. 28, 2016
Weighted-average assumptions used to determine benefit obligations |  |  |
Discount rate | 3.83% | 3.08% |
Weighted-average assumptions used to determine net perioidic pension cost |  |  |
Discount rate | 3.08% | 3.31% | 3.62%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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