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Restructuring Costs - Narrative (Details) ft² in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) | Apr. 01, 2017 USD ($) | Dec. 30, 2017 USD ($) ft² Employee
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 770 | $ 0 |
Employee Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | (3) |  |
Other Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 210 |  |
Restructuring Plan 2017 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Manufacturing facility square footage (in sqft) | ft² |  |  | 160
Expected restructuring costs | 1,900 |  |
Restructuring costs | 770 |  |
Expected remaining restructuring costs | 900 |  |
Restructuring Plan 2017 [Member] | Employee Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs |  |  | $ 203
Restructuring Plan 2017 [Member] | Relocation Of Machinery And Equipment And Administrative Offices [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 563 |  |
Restructuring Plan 2017 [Member] | Employee Retention, Facility Closing, And Other Closure Costs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 210 |  |
Restructuring Plan 2017 [Member] | Machinery And Equipment Relocation [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected remaining restructuring costs | 750 |  |
Restructuring Plan 2017 [Member] | Other Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected remaining restructuring costs | $ 150 |  |
Restructuring Plan 2017 [Member] | United States [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of positions eliminated related to restructuring | Employee |  |  | 4
Restructuring Plan 2017 [Member] | Sweden [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of positions eliminated related to restructuring | Employee |  |  | 6

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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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