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Restructuring Property, plant and equipment (Details) (USD $)
3 Months Ended 9 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Dec. 27, 2015
Dec. 28, 2014
Property, Plant and Equipment [Line Items]        
Restructuring Charges $ 1,872,000us-gaap_RestructuringCharges $ 0us-gaap_RestructuringCharges    
Property, plant and equipment, net 254,276,000us-gaap_PropertyPlantAndEquipmentNet     255,035,000us-gaap_PropertyPlantAndEquipmentNet
Payments for Restructuring (149,000)us-gaap_PaymentsForRestructuring      
Rogers, Arkansas facility closure [Member]        
Property, Plant and Equipment [Line Items]        
Restructuring and Related Cost, Expected Number of Positions Eliminated 500us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated
/ us-gaap_RestructuringPlanAxis
= sup_RogersArkansasfacilityclosureMember
     
Rogers, Arkansas facility closure [Member] | Rogers, Arkansas facility [Member]        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, net 500,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_RestructuringPlanAxis
= sup_RogersArkansasfacilityclosureMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= sup_RogersArkansasfacilityMember
     
Cost of Sales [Member] | Rogers, Arkansas facility closure [Member]        
Property, Plant and Equipment [Line Items]        
Restructuring Charges 1,900,000us-gaap_RestructuringCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_RestructuringPlanAxis
= sup_RogersArkansasfacilityclosureMember
     
Restructuring and Related Cost, Expected Cost 14,047,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_RestructuringPlanAxis
= sup_RogersArkansasfacilityclosureMember
     
Selling, General and Administrative Expenses [Member]        
Property, Plant and Equipment [Line Items]        
Other Depreciation and Amortization 200,000us-gaap_OtherDepreciationAndAmortization
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
     
Restructuring Costs, All Costs [Member] | Cost of Sales [Member] | Rogers, Arkansas facility closure [Member]        
Property, Plant and Equipment [Line Items]        
Restructuring and Related Cost, Expected Cost 14,000,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_RestructuringCostAndReserveAxis
= sup_RestructuringCostsAllCostsMember
/ us-gaap_RestructuringPlanAxis
= sup_RogersArkansasfacilityclosureMember
     
Scenario, Forecast [Member]        
Property, Plant and Equipment [Line Items]        
Payments for Restructuring     5,900,000us-gaap_PaymentsForRestructuring
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
 
Scenario, Forecast [Member] | Rogers, Arkansas facility closure [Member]        
Property, Plant and Equipment [Line Items]        
Restructuring and Related Cost, Expected Cost $ 2,200,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RestructuringPlanAxis
= sup_RogersArkansasfacilityclosureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember