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Benefit Plans and Collective Bargaining Agreements (Narrative) (Details) (USD $) | 12 Months Ended |
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012 | Jun. 27, 2014
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |  |
Maximum annual employee contribution (percent) | 100.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent |  |  |
Maximum annual employee contribution | $ 17,500us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount |  |  |
Minimum age for additional contribution under the Economic Growth and Tax Relief Reconciliation Act (years) | 50 years |  |  |
Additional maximum contribution under the Economic Growth and Tax Relief Reconciliation Act | 5,500synl_DefinedContributionPlanAdditionalAnnualContributionPerEmployeeAmountUnderEconomicGrowthAndTaxReliefReconciliationAct |  |  |
Maximum contribution under the Economic Growth and Tax Relief Reconciliation Act | 23,000synl_DefinedContributionPlanMaximumAnnualContributionPerEmployeeAmountUnderEconomicGrowthAndTaxReliefReconciliationAct |  |  |
Employer matching contribution (percent) | 4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent | 4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent | 4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |
401(k) employer contributions | 521,000us-gaap_DefinedContributionPlanCostRecognized | 550,000us-gaap_DefinedContributionPlanCostRecognized | 390,000us-gaap_DefinedContributionPlanCostRecognized |
Employer discretionary 401(k) contribution amount | 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount |
Employer contributions to union-sponsored defined contribution retirement plans | 2,329,000synl_MultiemployerPlansCollectiveBargainingArrangementAmountOfEmployersContributions | 882,000synl_MultiemployerPlansCollectiveBargainingArrangementAmountOfEmployersContributions | 739,000synl_MultiemployerPlansCollectiveBargainingArrangementAmountOfEmployersContributions |
Bristol, Tennessee and Mineral Ridge, Ohio Facilities [Member] |  |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |  |
Number of collective bargaining agreements (agreements) | 3synl_NumberOfCollectiveBargainingAgreements / us-gaap_StatementGeographicalAxis = synl_BristolTennesseeAndMineralRidgeOhioFacilitiesMember |  |  |
Number of company's employees represented by collective bargaining agreement (employees) | 162synl_MultiemployerPlansCollectiveBargainingArrangementNumberOfEmployersParticipants / us-gaap_StatementGeographicalAxis = synl_BristolTennesseeAndMineralRidgeOhioFacilitiesMember |  |  |
Percentage of company's employees represented by collective bargaining agreement (percent) | 35.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersParticipants / us-gaap_StatementGeographicalAxis = synl_BristolTennesseeAndMineralRidgeOhioFacilitiesMember |  |  |
United Steelworkers [Member] | Bristol, Tennessee and Mineral Ridge, Ohio Facilities [Member] |  |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |  |
Number of individuals representing a collective bargaining agreement (individual) | 2synl_NumberOfIndividualsRepresentingCollectiveBargainingAgreement / us-gaap_CollectiveBargainingArrangementAxis = synl_UnitedSteelworkersMember / us-gaap_StatementGeographicalAxis = synl_BristolTennesseeAndMineralRidgeOhioFacilitiesMember |  |  |
Teamsters [Member] | Bristol, Tennessee and Mineral Ridge, Ohio Facilities [Member] |  |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |  |
Number of individuals representing a collective bargaining agreement (individual) | 1synl_NumberOfIndividualsRepresentingCollectiveBargainingAgreement / us-gaap_CollectiveBargainingArrangementAxis = synl_TeamstersMember / us-gaap_StatementGeographicalAxis = synl_BristolTennesseeAndMineralRidgeOhioFacilitiesMember |  |  |
Number of employees represented by union | 2synl_NumberOfEmployeesRepresentedByUnion / us-gaap_CollectiveBargainingArrangementAxis = synl_TeamstersMember / us-gaap_StatementGeographicalAxis = synl_BristolTennesseeAndMineralRidgeOhioFacilitiesMember |  |  |
Bristol Fab [Member] |  |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |  |
Pension withdrawal liability from closure of Bristol Fab |  |  |  | $ 1,900,000us-gaap_MultiemployerPlansWithdrawalObligation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = synl_BristolFabMember

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- Definition Defined Contribution Plan, Additional Annual Contribution Per Employee, Amount Under Economic Growth and Tax Relief Reconciliation Act + References No definition available. + Details
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- Definition Defined Contribution Plan, Additional Annual Contribution Per Employee, Minimum Age Under Economic Growth and Tax Relief Reconciliation Act + References No definition available. + Details
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- Definition Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount Under Economic Growth and Tax Relief Reconciliation Act + References No definition available. + Details
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- Definition Multiemployer Plans, Collective-Bargaining Arrangement, Amount of Employer's Contributions + References No definition available. + Details
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- Definition Multiemployer Plans, Collective-Bargaining Arrangement, Number of Employer's Participants + References No definition available. + Details
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- Definition Number of Collective Bargaining Agreements + References No definition available. + Details
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- Definition Number Of Employees Represented By Union + References No definition available. + Details
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- Definition Number of Individuals Representing a Collective Bargaining Agreement + References No definition available. + Details
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- Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employee participants subject to a collective bargaining arrangement to all of the employer's participants in a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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