Annual report pursuant to Section 13 and 15(d)

Employee Benefits Employee Benefits (Details)

v2.4.1.9
Employee Benefits Employee Benefits (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 4,325us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 4,066us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 4,309us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
DefinedContributionBenefitPlanSupplementalPensionBenefitsAmount 415snhy_DefinedContributionBenefitPlanSupplementalPensionBenefitsAmount 327snhy_DefinedContributionBenefitPlanSupplementalPensionBenefitsAmount 330snhy_DefinedContributionBenefitPlanSupplementalPensionBenefitsAmount
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 100.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP 63,647us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP 91,158us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP  
Defined Benefit Plan Percentage of Employer Contribution Equal to Wages 10.00%snhy_DefinedBenefitPlanPercentageofEmployerContributionEqualtoWages    
Employee Stock Ownership Plan (ESOP), Compensation Expense 3,021us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense 2,881us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense 3,011us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense
Defined Benefit Contribution Plan Foreign Operations Expenses Recognized 673snhy_DefinedBenefitContributionPlanForeignOperationsExpensesRecognized 551snhy_DefinedBenefitContributionPlanForeignOperationsExpensesRecognized 633snhy_DefinedBenefitContributionPlanForeignOperationsExpensesRecognized
Defined Benefit Plan Compensation Expense $ 35snhy_DefinedBenefitPlanCompensationExpense $ 70snhy_DefinedBenefitPlanCompensationExpense $ 44snhy_DefinedBenefitPlanCompensationExpense
United Kingdom [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Stock Issued During Period, Shares, Employee Stock Ownership Plan 5,643us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan
/ us-gaap_StatementGeographicalAxis
= country_GB 		7,366us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan
/ us-gaap_StatementGeographicalAxis
= country_GB 		 
Germany [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Stock Issued During Period, Shares, Employee Stock Ownership Plan 4,699us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan
/ us-gaap_StatementGeographicalAxis
= country_DE 		7,015us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan
/ us-gaap_StatementGeographicalAxis
= country_DE