| Stock Based Compensation (Details Textual)
 | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 
      
        | Dec. 28, 2013 | Dec. 27, 2014
 USD ($) | Dec. 28, 2013
 USD ($) | Dec. 29, 2012 | Dec. 27, 2014
 Director Equity Plan [Member]
 USD ($) | Dec. 28, 2013
 Director Equity Plan [Member]
 USD ($) | Dec. 27, 2014
 2006 Stock Option Plan [Member]
 Awards | Dec. 27, 2014
 2006 Stock Option Plan [Member]
 Maximum [Member] | Dec. 27, 2014
 2001 Restricted Stock Plan [Member]
 USD ($) | Dec. 28, 2013
 2001 Restricted Stock Plan [Member]
 USD ($) | Dec. 27, 2014
 Equity Incentive Plan (2011 Plan) [Member] | Dec. 27, 2014
 Employee Stock Purchase Plan [Member]
 USD ($) | Dec. 28, 2013
 Employee Stock Purchase Plan [Member]
 USD ($) | Dec. 27, 2014
 Employee Stock Purchase Plan [Member]
 Minimum [Member] | Dec. 27, 2014
 Employee Stock Purchase Plan [Member]
 Minimum [Member]
 United States [Member]
 USD ($) | Dec. 27, 2014
 Employee Stock Purchase Plan [Member]
 Minimum [Member]
 United Kingdom [Member]
 GBP (£) | Dec. 27, 2014
 Employee Stock Purchase Plan and U.K. Plan [Member] | Dec. 27, 2014
 Nonemployee Director Equity and Deferred Compensation Plan [Member]
 USD ($) | 
      
        | Stock Option Plans (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
      
        | Shares available for issuance |  |  |  |  | 25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis
 = snhy_DirectorEquityPlanMember
 |  | 1,125,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis
 = snhy_TwoThousandAndSixStockOptionPlanMember
 |  | 928,125us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis
 = snhy_TwoThousandAndOneStockOptionPlanMember
 |  |  |  |  |  |  |  |  | 222,749us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis
 = snhy_NonemployeeDirectorEquityAndDeferredCompensationPlanMember
 | 
      
        | Exercise price per share not less than fair value percent |  |  |  |  |  |  | 110.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_AwardTypeAxis
 = snhy_TwoThousandAndSixStockOptionPlanMember
 |  |  |  |  |  |  |  |  |  |  |  | 
      
        | Exercise price per share more than voting stock |  |  |  |  |  |  | 10.00%snhy_ExercisePricePerShareMoreThanVotingStock / us-gaap_AwardTypeAxis
 = snhy_TwoThousandAndSixStockOptionPlanMember
 |  |  |  |  |  |  |  |  |  |  |  | 
      
        | Stock options maximum term (in years) |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  | 
      
        | Number of awards granted under 2006 plan |  |  |  |  |  |  | 0snhy_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfAwardsGrantedUnderPlan / us-gaap_AwardTypeAxis
 = snhy_TwoThousandAndSixStockOptionPlanMember
 |  |  |  |  |  |  |  |  |  |  |  | 
      
        | Minimum period before shares become non-forfeitable (in months) |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  | 
      
        | Plan Expiration year |  |  |  |  |  |  |  |  | 2011 |  |  |  |  |  |  |  |  |  | 
      
        | Aggregate shares of restricted stock grant | 103,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod |  | 90,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 89,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod |  |  |  |  |  |  | 1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis
 = snhy_EquityIncentivePlanTwoThousandAndElevenPlanMember
 | 1,096,875us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis
 = us-gaap_EmployeeStockMember
 |  |  |  |  |  |  | 
      
        | Remaining number of shares to be issued |  |  |  |  | 270,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis
 = snhy_DirectorEquityPlanMember
 |  |  |  |  |  | 732,062us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis
 = snhy_EquityIncentivePlanTwoThousandAndElevenPlanMember
 |  |  |  |  |  | 653,393us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis
 = snhy_EmployeeStockPurchasePlanAndUnitedKingdomPlanMember
 |  | 
      
        | Restricted stock expense |  |  |  |  |  |  |  |  | $ 2,961,000us-gaap_RestrictedStockExpense / us-gaap_AwardTypeAxis
 = snhy_TwoThousandAndOneStockOptionPlanMember
 | $ 2,234,000us-gaap_RestrictedStockExpense / us-gaap_AwardTypeAxis
 = snhy_TwoThousandAndOneStockOptionPlanMember
 |  |  |  |  |  |  |  |  | 
      
        | Total unrecognized compensation |  | 5,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
      
        | Recognized weighted average period (in years) |  | 1 year 8 months 45 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
      
        | Rate of common stock at market value |  |  |  |  |  |  |  |  |  |  |  | 85.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate / us-gaap_AwardTypeAxis
 = us-gaap_EmployeeStockMember
 |  |  |  |  |  |  | 
      
        | Ratio for additional common stock shares issued, under ESPP |  | 6snhy_EmployeeStockPurchasePlanIssueOfAdditionalCommonStockSharesRatio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
      
        | Shares allowed to be purchased by U.S. employees and U.K. employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000snhy_ShareBasedCompensationCommonStockAllowedToPurchaseOnMarketValue / us-gaap_AwardTypeAxis
 = us-gaap_EmployeeStockMember
 / us-gaap_RangeAxis
 = us-gaap_MinimumMember
 / us-gaap_StatementBusinessSegmentsAxis
 = country_US
 | 1,500snhy_ShareBasedCompensationCommonStockAllowedToPurchaseOnMarketValue / us-gaap_AwardTypeAxis
 = us-gaap_EmployeeStockMember
 / us-gaap_RangeAxis
 = us-gaap_MinimumMember
 / us-gaap_StatementBusinessSegmentsAxis
 = country_GB
 |  |  | 
      
        | Allowable purchase rate of common stock based on annual salary |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%snhy_ShareBasedCompensationAllowablePurchaseRateOfCommonStockBasedOnAnnualSalary / us-gaap_AwardTypeAxis
 = us-gaap_EmployeeStockMember
 / us-gaap_RangeAxis
 = us-gaap_MinimumMember
 |  |  |  |  | 
      
        | Number of shares purchased by employees |  |  |  |  |  |  |  |  |  |  |  | 25,238snhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesPurchased / us-gaap_AwardTypeAxis
 = us-gaap_EmployeeStockMember
 | 34,653snhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesPurchased / us-gaap_AwardTypeAxis
 = us-gaap_EmployeeStockMember
 |  |  |  |  |  | 
      
        | Weighted average price |  |  |  |  |  |  |  |  |  |  |  | $ 33.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased / us-gaap_AwardTypeAxis
 = us-gaap_EmployeeStockMember
 | $ 24.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased / us-gaap_AwardTypeAxis
 = us-gaap_EmployeeStockMember
 |  |  |  |  |  | 
      
        | Share based Compensation Expenses |  | 173,000us-gaap_EmployeeBenefitsAndShareBasedCompensation | 206,000us-gaap_EmployeeBenefitsAndShareBasedCompensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
      
        | Stock option granted, shares |  |  |  |  | 17,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis
 = snhy_DirectorEquityPlanMember
 | 16,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis
 = snhy_DirectorEquityPlanMember
 |  |  |  |  |  |  |  |  |  |  |  | 375us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis
 = snhy_NonemployeeDirectorEquityAndDeferredCompensationPlanMember
 | 
      
        | Cash fees paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid / us-gaap_AwardTypeAxis
 = snhy_NonemployeeDirectorEquityAndDeferredCompensationPlanMember
 | 
      
        | Fee for the chairs of each Board committee |  |  |  |  | 125.00%snhy_RateOfAdditionalFeesReceivedBasedOnNormalCompensation / us-gaap_PlanNameAxis
 = snhy_DirectorEquityPlanMember
 |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%snhy_RateOfAdditionalFeesReceivedBasedOnNormalCompensation / us-gaap_AwardTypeAxis
 = snhy_NonemployeeDirectorEquityAndDeferredCompensationPlanMember
 | 
      
        | Deferred stock units outstanding |  | 0us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
      
        | Common stock shares for each nonemployee director |  |  |  |  | 500us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionQuantityOfSecuritiesIssued / us-gaap_PlanNameAxis
 = snhy_DirectorEquityPlanMember
 |  |  |  |  |  |  |  |  |  |  |  |  |  | 
      
        | Share based Compensation Expenses under Director's plan |  |  |  |  | $ 677,000us-gaap_StockOptionPlanExpense / us-gaap_PlanNameAxis
 = snhy_DirectorEquityPlanMember
 | $ 592,000us-gaap_StockOptionPlanExpense / us-gaap_PlanNameAxis
 = snhy_DirectorEquityPlanMember
 |  |  |  |  |  |  |  |  |  |  |  |  |