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Special Charges (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Special Charges [Abstract]    
Special Charges $ 5.3syx_SpecialCharges $ 2.4syx_SpecialCharges
Asset Impairment Charges 0.6us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges
EMEA Technology Products Group [Member] | Workforce Reductions and Personnel Costs [Member]    
Special Charges [Abstract]    
Balance beginning of period 4.7us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= syx_EuropeanTechnologyProductsSegmentMember
 
Charged to expense 0us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= syx_EuropeanTechnologyProductsSegmentMember
 
Paid or otherwise settled (2.3)us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= syx_EuropeanTechnologyProductsSegmentMember
 
Balance end of period 2.4us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= syx_EuropeanTechnologyProductsSegmentMember
 
North America Technology Products Group [Member]    
Special Charges [Abstract]    
Special Charges 4.6syx_SpecialCharges
/ us-gaap_StatementBusinessSegmentsAxis
= syx_NorthAmericanTechnologyProductsSegmentMember
 
Asset Impairment Charges 0.3us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= syx_NorthAmericanTechnologyProductsSegmentMember
 
North America Technology Products Group [Member] | Workforce Reductions [Member]    
Special Charges [Abstract]    
Balance beginning of period 0us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= syx_SeveranceAndOtherExitCostsMember
/ us-gaap_StatementBusinessSegmentsAxis
= syx_NorthAmericanTechnologyProductsSegmentMember
 
Charged to expense 2.0us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= syx_SeveranceAndOtherExitCostsMember
/ us-gaap_StatementBusinessSegmentsAxis
= syx_NorthAmericanTechnologyProductsSegmentMember
 
Paid or otherwise settled 0us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringCostAndReserveAxis
= syx_SeveranceAndOtherExitCostsMember
/ us-gaap_StatementBusinessSegmentsAxis
= syx_NorthAmericanTechnologyProductsSegmentMember
 
Balance end of period 2.0us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= syx_SeveranceAndOtherExitCostsMember
/ us-gaap_StatementBusinessSegmentsAxis
= syx_NorthAmericanTechnologyProductsSegmentMember
 
Special Charges 2.0syx_SpecialCharges
/ us-gaap_RestructuringCostAndReserveAxis
= syx_SeveranceAndOtherExitCostsMember
/ us-gaap_StatementBusinessSegmentsAxis
= syx_NorthAmericanTechnologyProductsSegmentMember
 
North America Technology Products Group [Member] | Consulting Expenses [Member]    
Special Charges [Abstract]    
Special Charges 0.7syx_SpecialCharges
/ us-gaap_RestructuringCostAndReserveAxis
= syx_ConsultingExpensesMember
/ us-gaap_StatementBusinessSegmentsAxis
= syx_NorthAmericanTechnologyProductsSegmentMember
 
North America Technology Products Group [Member] | Professional Costs [Member]    
Special Charges [Abstract]    
Special Charges 1.6syx_SpecialCharges
/ us-gaap_RestructuringCostAndReserveAxis
= syx_LegalAndProfessionalFeesMember
/ us-gaap_StatementBusinessSegmentsAxis
= syx_NorthAmericanTechnologyProductsSegmentMember
 
Technology Products [Member]    
Special Charges [Abstract]    
Balance beginning of period 4.7us-gaap_RestructuringReserve
/ us-gaap_StatementBusinessSegmentsAxis
= syx_TechnologyProductsSegmentMember
 
Charged to expense 2.0us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= syx_TechnologyProductsSegmentMember
 
Paid or otherwise settled (2.3)us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_StatementBusinessSegmentsAxis
= syx_TechnologyProductsSegmentMember
 
Balance end of period 4.4us-gaap_RestructuringReserve
/ us-gaap_StatementBusinessSegmentsAxis
= syx_TechnologyProductsSegmentMember
 
Technology Products [Member] | Germany [Member]    
Special Charges [Abstract]    
Asset Impairment Charges 0.3us-gaap_AssetImpairmentCharges
/ us-gaap_RestructuringCostAndReserveAxis
= country_DE
/ us-gaap_StatementBusinessSegmentsAxis
= syx_TechnologyProductsSegmentMember
 
Industrial Products Group [Member] | Severance [Member]    
Special Charges [Abstract]    
Special Charges $ 0.4syx_SpecialCharges
/ us-gaap_RestructuringCostAndReserveAxis
= syx_SeveranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= syx_IndustrialProductsSegmentMember