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Employee Benefit Plans - Fair Value of Plan Assets (Details) - Pension benefits - USD ($) $ in Thousands | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
U.S. Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments measured at NAV | $ 4,296 | $ 9,431 |
Total assets at fair value | 28,729 | 31,754 |
U.S. Pension | Money market funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 12,852 | 17,560 |
U.S. Pension | Money market funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 12,852 | 17,560 |
U.S. Pension | Money market funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
U.S. Pension | Money market funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
U.S. Pension | Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 4,763 |
U.S. Pension | Equity funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 4,763 |
U.S. Pension | Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 11,581 |  |
U.S. Pension | Fixed income funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 11,581 |  |
U.S. Pension | Fixed income funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 |  |
U.S. Pension | Fixed income funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 |  |
Non-U.S. Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 726 | 557 | $ 426
Non-U.S. Pension | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 726 | 557 |
Non-U.S. Pension | Mutual funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 726 | 557 |
Non-U.S. Pension | Mutual funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Non-U.S. Pension | Mutual funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 0 | $ 0 |

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