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Employee Benefit Plans (Assumptions) (Details) | 12 Months Ended
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Dec. 25, 2019 | Dec. 26, 2018 | Dec. 27, 2017
Retirement Benefits [Abstract] |  |  |
Discount rate used to determine the benefit obligations | 2.56% | 3.83% |
Discount rate used to determine net period pension costs | 3.83% | 3.08% | 3.31%

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