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Environmental Compliance Costs (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 03, 2015 | Jan. 02, 2010 | Jan. 01, 2011 | Dec. 28, 2013 | Dec. 31, 2000 solid_waste_management_units
Environmental Exit Cost [Line Items] |  |  |  |  |
Environmental remediation reserves | 576us-gaap_AccrualForEnvironmentalLossContingencies |  |  | $ 626us-gaap_AccrualForEnvironmentalLossContingencies |
Minimum [Member] |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |
Environmental remediation costs, period of recognition (years) | 3 years |  |  |  |
Maximum [Member] |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |
Environmental remediation costs, period of recognition (years) | 4 years |  |  |  |
Comprehensive Environmental Response, Compensation, and Liability Act [Member] |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |
Number of environmental remediation sites (sites) | 2synl_SiteContingencyNumberOfSites / us-gaap_LitigationCaseAxis = synl_ComprehensiveEnvironmentalResponseCompensationAndLiabilityActMember |  |  |  |
Spartanburg Plant [Member] |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |
Number of solid waste management units |  |  |  |  | 14synl_NumberOfSolidWasteManagementUnits / us-gaap_EnvironmentalRemediationSiteAxis = synl_SpartanburgPlantMember
Environmental charges |  | 968us-gaap_EnvironmentalRemediationExpense / us-gaap_EnvironmentalRemediationSiteAxis = synl_SpartanburgPlantMember |  |  |
Augusta Plant [Member] |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |
Environmental remediation reserves | 501us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_EnvironmentalRemediationSiteAxis = synl_AugustaPlantMember |  |  | 551us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_EnvironmentalRemediationSiteAxis = synl_AugustaPlantMember |
Bristol, Tennessee Facility [Member] |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |
Environmental remediation reserves | 75us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_EnvironmentalRemediationSiteAxis = synl_BristolTennesseeFacilityMember |  |  | 75us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_EnvironmentalRemediationSiteAxis = synl_BristolTennesseeFacilityMember |
Number of solid waste management units | 2synl_NumberOfSolidWasteManagementUnits / us-gaap_EnvironmentalRemediationSiteAxis = synl_BristolTennesseeFacilityMember |  |  |  |
Superfund Site [Member] |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |
De minimis environmental remediation settlement |  |  | $ 2synl_DeMinimisEnvironmentalRemediationSettlement / us-gaap_EnvironmentalRemediationSiteAxis = synl_SuperfundSiteMember |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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