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Employee Benefit Plans (Details 4) - Swiss Plan [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2017 | Dec. 30, 2016
Plan assets at fair value, beginning of period | $ 3,606 | $ 3,498
Actual return on plan assets | (203) | 12
Plan assets at fair value, end of period | 4,144 | 3,606
Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Plan assets at fair value, beginning of period | 3,606 | 3,498
Actual return on plan assets | 203 | (12)
Purchases, sales and settlement | 335 | 120
Plan assets at fair value, end of period | $ 4,144 | $ 3,606

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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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- 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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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from purchases, sales and settlements. + 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 (d)(5)(iv)(02)(B) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Details
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