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Income Taxes (Effective Tax Rate Reconciliation) (Details) (USD $) | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Income Tax Expense Reconciliation |  |  |
Tax at U.S. statutory rates | $ 6,302,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 1,397,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 1,998,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal tax benefit | 324,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 74,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 106,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Palmer earn-out adjustment | (1,217,000)synl_EffectiveIncomeTaxRateReconciliationBusinessCombinationEarnOutAdjustment | 0synl_EffectiveIncomeTaxRateReconciliationBusinessCombinationEarnOutAdjustment | 0synl_EffectiveIncomeTaxRateReconciliationBusinessCombinationEarnOutAdjustment
Bargain gain on CRI acquisition | 0synl_EffectiveIncomeTaxRateReconciliationBargainPurchaseGain | (366,000)synl_EffectiveIncomeTaxRateReconciliationBargainPurchaseGain | 0synl_EffectiveIncomeTaxRateReconciliationBargainPurchaseGain
Manufacturing exemption | (458,000)synl_IncomeTaxReconciliationManufacturingExemption | (138,000)synl_IncomeTaxReconciliationManufacturingExemption | (180,000)synl_IncomeTaxReconciliationManufacturingExemption
Stock issuance costs | 0synl_EffectiveIncomeTaxRateReconciliationStockIssuanceCostsAmount | 101,000synl_EffectiveIncomeTaxRateReconciliationStockIssuanceCostsAmount | 0synl_EffectiveIncomeTaxRateReconciliationStockIssuanceCostsAmount
Stock option compensation | 91,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 85,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 38,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Uncertain tax positions | 139,000us-gaap_IncomeTaxReconciliationTaxContingencies | 0us-gaap_IncomeTaxReconciliationTaxContingencies | 0us-gaap_IncomeTaxReconciliationTaxContingencies
Other, net | 205,000us-gaap_IncomeTaxReconciliationOtherAdjustments | 57,000us-gaap_IncomeTaxReconciliationOtherAdjustments | (68,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Total | $ 5,386,000us-gaap_IncomeTaxExpenseBenefit | $ 1,210,000us-gaap_IncomeTaxExpenseBenefit | $ 1,894,000us-gaap_IncomeTaxExpenseBenefit
Effective Tax Rate Reconciliation |  |  |
Tax at U.S. statutory rates (percent) | 35.00333%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal tax benefit (percent) | 1.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 1.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 1.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Palmer earn-out adjustment (percent) | (6.80%)synl_EffectiveIncomeTaxRateReconciliationBusinessCombinationEarnOutAdjustmentPercent | 0.00%synl_EffectiveIncomeTaxRateReconciliationBusinessCombinationEarnOutAdjustmentPercent | 0.00%synl_EffectiveIncomeTaxRateReconciliationBusinessCombinationEarnOutAdjustmentPercent
Bargain gain on CRI acquisition (percent) | 0.00%synl_EffectiveIncomeTaxRateReconciliationBargainPurchaseGainPercent | (8.90%)synl_EffectiveIncomeTaxRateReconciliationBargainPurchaseGainPercent | 0.00%synl_EffectiveIncomeTaxRateReconciliationBargainPurchaseGainPercent
Manufacturing exemption (percent) | (2.50%)synl_EffectiveIncomeTaxRateReconciliationManufacturingExemption | (3.40%)synl_EffectiveIncomeTaxRateReconciliationManufacturingExemption | (3.10%)synl_EffectiveIncomeTaxRateReconciliationManufacturingExemption
Stock issuance costs (percent) | 0.00%synl_EffectiveIncomeTaxRateReconciliationStockIssuanceCostsPercent | 2.50%synl_EffectiveIncomeTaxRateReconciliationStockIssuanceCostsPercent | 0.00%synl_EffectiveIncomeTaxRateReconciliationStockIssuanceCostsPercent
Stock option compensation (percent) | 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost | 2.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost | 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Uncertain tax positions (percent) | 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Other, net (percent) | 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total (percent) | 29.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 29.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 32.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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