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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Assets available for sale [Abstract] |  |  |  |  |
Asset sold |  | $ 0.9 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | $ 1.0 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | $ 0.3 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | $ 0.1 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Special charges |  | 0.2 syx_SpecialCharges |  |  |
Evaluation of Long-lived Assets [Abstract] |  |  |  |  |
Impairment charge | 9.5 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  | 9.5 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  |
Goodwill and Intangible Asset [Abstract] |  |  |  |  |
Impairment charge | 0.5 us-gaap_GoodwillAndIntangibleAssetImpairment |  |  |  |
Intangible write-offs |  |  | 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | 2.9 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill |
Advertising Costs [Abstract] |  |  |  |  |
Amortization period, minimum |  |  | 1 month |  |
Amortization period, maximum |  |  | 4 months |  |
Advertising expense |  |  | 66.1 us-gaap_AdvertisingExpense | 60.1 us-gaap_AdvertisingExpense | 57.7 us-gaap_AdvertisingExpense
Vendor consideration |  |  | 38.8 syx_VendorConsideration | 45.9 syx_VendorConsideration | 47.8 syx_VendorConsideration
Deferred advertising costs | 0.1 us-gaap_DeferredAdvertisingCosts |  | 0.1 us-gaap_DeferredAdvertisingCosts | 0.7 us-gaap_DeferredAdvertisingCosts |
Net Income Per Common Share [Abstract] |  |  |  |  |
Weighted average number of stock options outstanding, treasury stock (in shares) |  |  | 0 us-gaap_WeightedAverageNumberOfSharesTreasuryStock | 0 us-gaap_WeightedAverageNumberOfSharesTreasuryStock | 0 us-gaap_WeightedAverageNumberOfSharesTreasuryStock
Weighted average number of stock options outstanding, restricted stock (in shares) |  |  | 0 us-gaap_WeightedAverageNumberOfSharesRestrictedStock | 0 us-gaap_WeightedAverageNumberOfSharesRestrictedStock | 0 us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Employee Benefit Plans [Abstract] |  |  |  |  |
Minimum annual contribution per employee (in hundredths) |  |  | 1.00%syx_DefinedContributionPlanMinimumAnnualContributionPerEmployeePercent |  |
Aggregate expense in contributions plans |  |  | 0.9 us-gaap_DefinedContributionPlanCostRecognized | 0.9 us-gaap_DefinedContributionPlanCostRecognized | 1.0 us-gaap_DefinedContributionPlanCostRecognized
Fair Value Measurements [Abstract] |  |  |  |  |
Impairment charge | $ 9.5 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  | $ 9.5 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration of risk threshold (in hundredths) | 10.00%syx_ConcentrationOfRiskThreshold |  | 10.00%syx_ConcentrationOfRiskThreshold |  |
Supplier Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk (in hundredths) |  |  |  | 13.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember | 0.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember
Supplier Concentration Risk [Member] | Vendor One [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk (in hundredths) |  |  | 12.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / syx_VendorsAxis = syx_VendorOneMember |  |
Supplier Concentration Risk [Member] | Vendor Two [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk (in hundredths) |  |  | 11.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / syx_VendorsAxis = syx_VendorTwoMember |  |
Restricted Stock [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) |  |  | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember | 0.1 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember
Stock Options [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) |  |  | 0.8 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 1.2 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 1.1 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember
Furniture, Fixtures and Equipment [Member] | Minimum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated useful lives |  |  | P3Y |  |
Furniture, Fixtures and Equipment [Member] | Maximum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated useful lives |  |  | P10Y |  |
Building [Member] | Minimum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated useful lives |  |  | P30Y |  |
Building [Member] | Maximum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated useful lives |  |  | P50Y |  |

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