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v2.4.1.9

Deferred Compensation (Narrative) (Details) (Former Officers [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Jan. 03, 2015 | Dec. 28, 2013
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Minimum period of deferred compensation benefits (years) | 10 years |
Minimum deferred compensation benefit age (years) | 65 years |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Present value of vested future deferred compensation payments | 261us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_TitleOfIndividualAxis = synl_FormerOfficersMember | $ 271us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_TitleOfIndividualAxis = synl_FormerOfficersMember

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- Definition Deferred Compensation Arrangement with Individual, Allocated Share-based Compensation Expense, Minimum Benefit Age + References No definition available. + Details
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Namespace Prefix: | synl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Deferred Compensation Arrangement with Individual, Minimum Contractual Term + References No definition available. + Details
Name: | synl_DeferredCompensationArrangementWithIndividualMinimumContractualTerm
Namespace Prefix: | synl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant