Annual report pursuant to Section 13 and 15(d)

Acquisitions (Details Textual)

v2.4.1.9
Acquisitions (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended 3 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Oct. 18, 2012
Dec. 28, 2013
Apr. 01, 2013
Mar. 30, 2013
Business Acquisition [Line Items]              
Percentage of Common Stock Purchased           60.00%snhy_PurchaseOfRemainingInterestInEquityInvestee  
Transaction cost arising from acquisition           $ 1,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts  
Goodwill 5,141us-gaap_Goodwill 5,221us-gaap_Goodwill 4,472us-gaap_Goodwill   5,221us-gaap_Goodwill    
Gross carrying amount 4,479us-gaap_FiniteLivedIntangibleAssetsGross 3,404us-gaap_FiniteLivedIntangibleAssetsGross     3,404us-gaap_FiniteLivedIntangibleAssetsGross    
Gain on purchase of business 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount 528us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount        
Equity method investment, ownership percentage             40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Series of Individually Immaterial Business Acquisitions [Member]              
Business Acquisition [Line Items]              
Transaction cost arising from acquisition       1,458us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
     
Goodwill       1,731us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
  726us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
 
Gross carrying amount           746us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
 
Acquisition-related costs (included in Selling, engineering, and administrative expenses)         12us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
   
Gain on purchase of business         528us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
   
Percentage of sale of component supplier       80.00%snhy_BusinessAcquisitionRevenuePercentageAttributableToAcquiree
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
     
Seungwon Solutions Corporation [Member]              
Business Acquisition [Line Items]              
Transaction cost arising from acquisition       80us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= snhy_SeungwonSolutionsCorporationMember
     
Trade Name [Member]              
Business Acquisition [Line Items]              
Gross carrying amount 774us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
774us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
    774us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
   
Finite-lived intangible assets, estimated useful life         1 year    
Trade Name [Member] | Series of Individually Immaterial Business Acquisitions [Member]              
Business Acquisition [Line Items]              
Trade name           18us-gaap_FiniteLivedTradeNamesGross
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
 
Noncompete Agreements [Member]              
Business Acquisition [Line Items]              
Gross carrying amount 11us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
11us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
    11us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
   
Finite-lived intangible assets, estimated useful life         2 years    
Noncompete Agreements [Member] | Series of Individually Immaterial Business Acquisitions [Member]              
Business Acquisition [Line Items]              
Non-compete agreements           11us-gaap_FiniteLivedNoncompeteAgreementsGross
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
 
Customer Relationships [Member]              
Business Acquisition [Line Items]              
Gross carrying amount 1,751us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
1,751us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
    1,751us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Customer Relationships [Member] | Series of Individually Immaterial Business Acquisitions [Member]              
Business Acquisition [Line Items]              
Finite-lived intangible assets, estimated useful life         15 years    
Customer relationships           276us-gaap_FiniteLivedCustomerRelationshipsGross
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
 
Developed Technology Rights [Member] | Series of Individually Immaterial Business Acquisitions [Member]              
Business Acquisition [Line Items]              
Finite-lived intangible assets, estimated useful life         10 years    
Acquired definite lived intangible assets           $ 441us-gaap_OtherFiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember