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Income Taxes (Narrative) (Details) (USD $) | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Income Tax Disclosures [Line Items] |  |  |
Income tax payments | $ 2,091,000us-gaap_IncomeTaxesPaid | $ 2,445,000us-gaap_IncomeTaxesPaid | $ 1,991,000us-gaap_IncomeTaxesPaid
State Jurisdiction [Member] |  |  |
Income Tax Disclosures [Line Items] |  |  |
Net operating loss carryforwards | 50,774,000us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 45,503,000us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Portion of NOL subject to valuation allowance | 45,965,000synl_PortionOfNetOperatingLossSubjectToValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Valuation allowance for net operating loss carrryforwards | 1,570,000us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Operating Loss Carryforwards [Member] | State Jurisdiction [Member] |  |  |
Income Tax Disclosures [Line Items] |  |  |
Increase in valuation allowance during the period | $ 178,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember |  |

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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