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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 21, 2014 | Jan. 03, 2015 segments | Dec. 28, 2013 | Dec. 29, 2012 | Aug. 21, 2012 | Aug. 21, 2014 | Aug. 21, 2015
Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of operating segments (segments) |  | 2us-gaap_NumberOfOperatingSegments |  |  |  |  |
Inventory reserves |  | $ 4,866,000us-gaap_InventoryValuationReserves | $ 2,217,000us-gaap_InventoryValuationReserves |  |  |  |
Intangible asset depreciation period (years) | 10 years |  |  |  |  |  |
Deferred charges and intangible assets |  | 20,961,000synl_IntangibleAssetsExcludingGoodwillIncludingDeferredCharges | 9,407,000synl_IntangibleAssetsExcludingGoodwillIncludingDeferredCharges |  |  |  |
Accumulated amortization on deferred charges |  | 3,670,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 2,203,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  |  |  |
Shipping costs |  | 3,775,000us-gaap_ShippingHandlingAndTransportationCosts | 4,871,000us-gaap_ShippingHandlingAndTransportationCosts | 3,445,000us-gaap_ShippingHandlingAndTransportationCosts |  |  |
Research and development expense |  | 531,000us-gaap_ResearchAndDevelopmentExpense | 558,000us-gaap_ResearchAndDevelopmentExpense | 612,000us-gaap_ResearchAndDevelopmentExpense |  |  |
Cash value of life insurance |  | 2,046,512us-gaap_CashSurrenderValueOfLifeInsurance | 2,007,419us-gaap_CashSurrenderValueOfLifeInsurance |  |  |  |
Interest rate swap liability |  | 215,188us-gaap_DerivativeFairValueOfDerivativeLiability | 80,498us-gaap_DerivativeFairValueOfDerivativeLiability |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  | 2,335,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two |  | 2,171,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three |  | 2,032,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four |  | 1,868,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five |  | 1,740,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five |  | 7,145,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  |  |  |  |
Amortization expense |  | 1,466,000us-gaap_AmortizationOfIntangibleAssets | 1,598,000us-gaap_AmortizationOfIntangibleAssets | 568,000us-gaap_AmortizationOfIntangibleAssets |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | 5,862,031us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | 8,208,831us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue |  |  |  |
Interest expense charged during the year |  | 96,933synl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisInterestExpenseChargedDuringPeriod | 153,200synl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisInterestExpenseChargedDuringPeriod |  |  |  |
Change in fair value of contingent consideration liability associated with the Palmer acquisition |  | (3,476,197)synl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisIncreaseDecreaseInFairValueOfContingentConsiderationLiability |  |  |  |  |
Payment to Palmer sellers |  |  | (2,500,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements |  |  |  |
Present value of contingent consideration liability associated with the Specialty acquisition |  | 4,773,620synl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisPresentValueContingentConsiderationLiabilityAssociatedWithAcquisition |  |  |  |  |
Ending balance |  | 7,256,387us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | 5,862,031us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | 8,208,831us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue |  |  |
Palmer of Texas [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Intangible asset depreciation period (years) |  |  |  |  | 15 years |  |
Contingent consideration earn-out period (years) |  | 3 years |  |  | 3 years |  |
EBITDA threshold target |  |  |  |  | 17,475,000synl_BusinessAcquisitionContingentConsiderationEbitdaThresholdThreeYearLowerRangeForEarnOutPayment / us-gaap_BusinessAcquisitionAxis = synl_PalmerOfTexasMember |  |
Contingent consideration payment, lower limit |  |  |  |  | 2,500,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = synl_PalmerOfTexasMember |  |
EBITDA threshold, upper range for earn out payment |  |  |  |  | 6,825,000synl_BusinessAcquisitionContingentConsiderationEbitdaThresholdUpperRangeForEarnOutPayment / us-gaap_BusinessAcquisitionAxis = synl_PalmerOfTexasMember |  |
Specialty Pipe And Tube, Inc. [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Contingent consideration earn-out period (years) | 2 years | 2 years |  |  |  |  |
Allowance for Doubtful Accounts [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Allowance for doubtful accounts pursuant to acquisition |  | 667,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | (192,000)us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | 928,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  |  |
Allowance for Doubtful Accounts [Member] | Palmer of Texas [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of days subsequent to acquistion for establishment of an allowance for doubtful accounts (days) |  | 120 days |  |  |  |  |
Allowance for doubtful accounts pursuant to acquisition |  | 821,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_BusinessAcquisitionAxis = synl_PalmerOfTexasMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  |  |  |  |
Number of days after acquisition for uncollected accounts receivable to be remitted to Company (days) |  | 120 days |  |  |  |  |
Allowance for Doubtful Accounts [Member] | Specialty Pipe And Tube, Inc. [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Allowance for doubtful accounts pursuant to acquisition |  | 76,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_BusinessAcquisitionAxis = synl_SpecialtyPipeAndTubeInc.Member / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Accounts receivable, payment terms (days) |  | 30 days |  |  |  |  |
Intangible asset depreciation period (years) |  | 10 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Accounts receivable, payment terms (days) |  | 60 days |  |  |  |  |
Intangible asset depreciation period (years) |  | 15 years |  |  |  |  |
Land improvements and buildings [Member] | Minimum [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Depreciation useful life (years) |  | 10 years |  |  |  |  |
Land improvements and buildings [Member] | Maximum [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Depreciation useful life (years) |  | 40 years |  |  |  |  |
Machinery, fixtures and equipment [Member] | Minimum [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Depreciation useful life (years) |  | 3 years |  |  |  |  |
Machinery, fixtures and equipment [Member] | Maximum [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Depreciation useful life (years) |  | 20 years |  |  |  |  |
Software licenses [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Depreciation useful life (years) |  | 5 years |  |  |  |  |
Metals Segment [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of subsidiaries (subsidiaries) |  | 3synl_NumberOfSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember |  |  |  |  |
Specialty Chemicals Segment [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of subsidiaries (subsidiaries) |  | 2synl_NumberOfSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = synl_SpecialtyChemicalsSegmentMember |  |  |  |  |
Bristol Metals, LLC, Palmer of Texas Tanks, Inc., and Specialty Pipe & Tube [Member] | Metals Segment [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Ownership percentage of subsidiary (percent) |  | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = synl_MetalsSegmentSubsidiariesMember / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember |  |  |  |  |
Manufacturers Soap and Chemical Company [Member] | Specialty Chemicals Segment [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Ownership percentage of subsidiary (percent) |  | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = synl_SpecialtyChemicalsSegmentSubsidiariesMember / us-gaap_StatementBusinessSegmentsAxis = synl_SpecialtyChemicalsSegmentMember |  |  |  |  |
Deferred Charges [Member] | Minimum [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Intangible asset depreciation period (years) |  | 3 years |  |  |  |  |
Deferred Charges [Member] | Maximum [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Intangible asset depreciation period (years) |  | 10 years |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Weighted average amortization period (years) |  | 12 years |  |  |  |  |
Term Loan [Member] | Interest Rate Swap [Member] | Palmer of Texas [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Fair value of interest rate swap |  | 11,000us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BusinessAcquisitionAxis = synl_PalmerOfTexasMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_LongtermDebtTypeAxis = synl_TermLoanMember | 301,000us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BusinessAcquisitionAxis = synl_PalmerOfTexasMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_LongtermDebtTypeAxis = synl_TermLoanMember |  |  |  |
Term Loan [Member] | Interest Rate Swap [Member] | Color Resources, LLC [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Interest rate swap liability |  | 215,000us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BusinessAcquisitionAxis = synl_ColorResourcesLLCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_LongtermDebtTypeAxis = synl_TermLoanMember | 80,000us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BusinessAcquisitionAxis = synl_ColorResourcesLLCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_LongtermDebtTypeAxis = synl_TermLoanMember |  |  |  |
Year 2 [Member] | Palmer of Texas [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
EBITDA threshold target |  |  |  |  |  | 5,825,000synl_BusinessAcquisitionContingentConsiderationEbitdaThresholdThreeYearLowerRangeForEarnOutPayment / us-gaap_BusinessAcquisitionAxis = synl_PalmerOfTexasMember / us-gaap_ContingentConsiderationByTypeAxis = synl_Year2Member |
Contingent consideration payment, lower limit |  |  |  |  |  | 2,500,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = synl_PalmerOfTexasMember / us-gaap_ContingentConsiderationByTypeAxis = synl_Year2Member |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |
Change in fair value of contingent consideration liability associated with the Palmer acquisition |  | (3,476,000)synl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisIncreaseDecreaseInFairValueOfContingentConsiderationLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Scenario, Forecast [Member] | Year 3 [Member] | Palmer of Texas [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
EBITDA threshold target |  |  |  |  |  |  | 5,825,000synl_BusinessAcquisitionContingentConsiderationEbitdaThresholdThreeYearLowerRangeForEarnOutPayment / us-gaap_BusinessAcquisitionAxis = synl_PalmerOfTexasMember / us-gaap_ContingentConsiderationByTypeAxis = synl_Year3Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
EBITDA threshold, upper range for earn out payment |  |  |  |  |  |  | $ 6,825,000synl_BusinessAcquisitionContingentConsiderationEbitdaThresholdUpperRangeForEarnOutPayment / us-gaap_BusinessAcquisitionAxis = synl_PalmerOfTexasMember / us-gaap_ContingentConsiderationByTypeAxis = synl_Year3Member / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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- Definition Number of Days Subsequent to Acquisition for Establishment of an Allowance for Doubtful Accounts + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -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 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition For contingent consideration arrangements and indemnification assets recognized in connection with a business combination, this element represents an estimate of the low-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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