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Employee Benefit Plans - Changes in Plans and AOCI Impacts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Pension benefits | U.S. Pension |  |  |
Change in Projected Benefit Obligation: |  |  |
Projected benefit obligation at beginning of year | $ 31,935 | $ 31,310 |
Acquisitions | 0 | 0 |
Service cost | 685 | 723 | $ 842
Interest cost | 1,231 | 1,273 | 1,229
Actuarial loss | 2,626 | 575 |
Benefits paid | (1,720) | (1,946) |
Settlement payment | 0 | 0 |
Currency translation | 0 | 0 |
Projected benefit obligation at end of year | 34,757 | 31,935 | 31,310
Change in Plan Assets: |  |  |
Fair value of plan assets at beginning of year | 28,985 | 27,776 |
Actual return on plan assets | 3,409 | 2,075 |
Employer contributions | 1,080 | 1,080 |
Benefits paid | (1,720) | (1,946) |
Settlement payment | 0 | 0 |
Currency translation | 0 | 0 |
Fair value of plan assets at end of year | 31,754 | 28,985 | 27,776
Unfunded Status | (3,003) | (2,950) |
Accumulated Benefit Obligation at End of Year | 30,311 | 27,573 |
Current liability | 0 | 0 |
Non-current liability | (3,003) | (2,950) |
Unrecognized net actuarial loss | (7,485) | (7,383) |
Unrecognized prior service cost | 0 | (53) |
Total | (7,485) | (7,436) |
Current year net actuarial (loss) gain | (544) | 213 |
Amortization of prior service cost | 53 | 55 |
Amortization of net actuarial loss | 442 | 498 |
Settlement loss | 0 | 0 |
Currency translation | 0 | 0 |
Total | (49) | 766 |
Pension benefits | Non-U.S. Pension |  |  |
Change in Projected Benefit Obligation: |  |  |
Projected benefit obligation at beginning of year | 3,341 | 3,041 |
Acquisitions | 241 | 380 |
Service cost | 148 | 102 | 105
Interest cost | 114 | 107 | 102
Actuarial loss | 270 | 58 |
Benefits paid | (265) | (63) |
Settlement payment | 0 | 0 |
Currency translation | 421 | (284) |
Projected benefit obligation at end of year | 4,270 | 3,341 | 3,041
Change in Plan Assets: |  |  |
Fair value of plan assets at beginning of year | 426 | 396 |
Actual return on plan assets | 23 | 6 |
Employer contributions | 355 | 159 |
Benefits paid | (265) | (63) |
Settlement payment | 0 | 0 |
Currency translation | 18 | (72) |
Fair value of plan assets at end of year | 557 | 426 | 396
Unfunded Status | (3,713) | (2,915) |
Accumulated Benefit Obligation at End of Year | 3,047 | 2,549 |
Current liability | (205) | (194) |
Non-current liability | (3,508) | (2,721) |
Unrecognized net actuarial loss | (1,085) | (784) |
Unrecognized prior service cost | (52) | (42) |
Total | (1,137) | (826) |
Current year net actuarial (loss) gain | (277) | (75) |
Amortization of prior service cost | 6 | 4 |
Amortization of net actuarial loss | 38 | 39 |
Settlement loss | 0 | 0 |
Currency translation | (78) | 85 |
Total | (311) | 53 |
Other Post-Retirement |  |  |
Change in Projected Benefit Obligation: |  |  |
Projected benefit obligation at beginning of year | 3,894 | 3,539 |
Acquisitions | 0 | 0 |
Service cost | 175 | 130 | 117
Interest cost | 170 | 156 | 147
Actuarial loss | 635 | 686 |
Benefits paid | (175) | (180) |
Settlement payment | 0 | (415) |
Currency translation | 5 | (22) |
Projected benefit obligation at end of year | 4,704 | 3,894 | 3,539
Change in Plan Assets: |  |  |
Fair value of plan assets at beginning of year | 28 | 26 |
Actual return on plan assets | 1 | 1 |
Employer contributions | 179 | 601 |
Benefits paid | (175) | (180) |
Settlement payment | 0 | (415) |
Currency translation | 2 | (5) |
Fair value of plan assets at end of year | 35 | 28 | $ 26
Unfunded Status | (4,669) | (3,866) |
Accumulated Benefit Obligation at End of Year | 0 | 0 |
Current liability | (173) | (183) |
Non-current liability | (4,496) | (3,683) |
Unrecognized net actuarial loss | (1,424) | (872) |
Unrecognized prior service cost | (439) | (525) |
Total | (1,863) | (1,397) |
Current year net actuarial (loss) gain | (634) | (685) |
Amortization of prior service cost | 88 | 88 |
Amortization of net actuarial loss | 83 | 50 |
Settlement loss | 0 | 114 |
Currency translation | (3) | (29) |
Total | $ (466) | $ (462) |

X
- Definition Before tax amount, net of reclassifications, of pension and other postretirement benefit plans (gain) loss included in accumulated other comprehensive income related to foreign currency translation. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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