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PROPERTY, PLANT AND EQUIPMENT (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, plant and equipment, net [Abstract]        
Property, plant and equipment, Gross $ 173.0us-gaap_PropertyPlantAndEquipmentGross $ 173.0us-gaap_PropertyPlantAndEquipmentGross $ 179.7us-gaap_PropertyPlantAndEquipmentGross  
Less accumulated depreciation and amortization 131.8us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 131.8us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 120.3us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property, plant and equipment, net 41.2us-gaap_PropertyPlantAndEquipmentNet 41.2us-gaap_PropertyPlantAndEquipmentNet 59.4us-gaap_PropertyPlantAndEquipmentNet  
Included in property, plant and equipment are assets under capital leases [Abstract]        
Property, plant and equipment, assets under capital leases Gross 17.4us-gaap_CapitalLeasedAssetsGross 17.4us-gaap_CapitalLeasedAssetsGross 17.4us-gaap_CapitalLeasedAssetsGross  
Less: Accumulated amortization 14.5us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation 14.5us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation 12.0us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation  
Property, plant and equipment, assets under capital leases, net 2.9us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet 2.9us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet 5.4us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet  
Depreciation   15.4us-gaap_Depreciation 17.4us-gaap_Depreciation 16.6us-gaap_Depreciation
Impairment charge 9.5us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf 9.5us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf    
Land and Buildings [Member]        
Property, plant and equipment, net [Abstract]        
Property, plant and equipment, Gross 18.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
18.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
19.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
 
Furniture and Fixtures, Office, Computer and Other Equipment and Software [Member]        
Property, plant and equipment, net [Abstract]        
Property, plant and equipment, Gross 127.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= syx_FurnitureAndFixturesOfficeComputerAndOtherEquipmentAndSoftwareMember
127.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= syx_FurnitureAndFixturesOfficeComputerAndOtherEquipmentAndSoftwareMember
129.2us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= syx_FurnitureAndFixturesOfficeComputerAndOtherEquipmentAndSoftwareMember
 
Leasehold Improvements [Member]        
Property, plant and equipment, net [Abstract]        
Property, plant and equipment, Gross $ 26.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
$ 26.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
$ 30.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember