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Employee Benefit Plans - Fair Value of Plan Assets (Details) - Pension benefits - USD ($) $ in Thousands | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
--- | --- | --- | ---
U.S. Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments measured at NAV | $ 9,431 | $ 8,667 |
Total assets at fair value | 31,754 | 28,985 | $ 27,776
U.S. Pension | Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 22,323 | 20,318 |
U.S. Pension | Mutual Funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 22,323 | 20,318 |
U.S. Pension | Mutual Funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
U.S. Pension | Mutual Funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Non-U.S. Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 557 | 426 | $ 396
Non-U.S. Pension | Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 557 | 426 |
Non-U.S. Pension | Mutual Funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 557 | 426 |
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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- Definition Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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