Annual report pursuant to Section 13 and 15(d)

Income Taxes (Uncertain Tax Positions) (Details)

v2.4.1.9
Income Taxes (Uncertain Tax Positions) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Jan. 03, 2015
Unrecognized Tax Benefit        
Beginning balance $ 0us-gaap_UnrecognizedTaxBenefits $ 0us-gaap_UnrecognizedTaxBenefits    
Increases related to prior year tax positions 1,431us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions    
Decreases related to prior year tax positions 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions    
Increases related to current year tax position 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions    
Settlements during period 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities    
Lapse of statue of limitations 0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations    
Ending balance 1,431us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits  
Interest and Penalties        
Beginning balance 73us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Increases related to prior year tax positions 73synl_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpenseIncreaseResultingFromPriorPeriodTaxPositions 0synl_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpenseIncreaseResultingFromPriorPeriodTaxPositions    
Ending balance 73us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Total unrecognized tax benefit, interest and penalties, Beginning balance 0synl_UnrecognizedTaxBenefitIncludingInterestAndPenalties 0synl_UnrecognizedTaxBenefitIncludingInterestAndPenalties   1,504synl_UnrecognizedTaxBenefitIncludingInterestAndPenalties
Total increase in unrecognized tax benefit, interest and penalties related to prior year tax positions 1,504synl_UncertainTaxPositionsIncludingInterestAndPenaltiesRelatedToPriorYearTaxPositions 0synl_UncertainTaxPositionsIncludingInterestAndPenaltiesRelatedToPriorYearTaxPositions    
Total unrecognized tax benefit, interest and penalties, Ending balance $ 1,504us-gaap_LiabilityForUncertainTaxPositionsNoncurrent