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SHAREHOLDER'S EQUITY (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2014
Plan
Dec. 31, 2013
Dec. 31, 2012
Apr. 30, 2006
May 31, 2005
Oct. 31, 2004
Nov. 30, 2011
Installment
Oct. 31, 2011
Installment
Aug. 31, 2010
Installment
Mar. 31, 2012
Installment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of compensation plans 5syx_NumberOfEquityCompensationPlans                  
Share based compensation cost $ 1.5us-gaap_ShareBasedCompensation $ 2.9us-gaap_ShareBasedCompensation $ 4.1us-gaap_ShareBasedCompensation              
5.00 to 10.00 [Member]                    
Options vested and exercisable or nonvested that are expected to vest (nonvested outstanding less expected forfeitures) [Abstract]                    
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 5.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeOneMember
                 
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 10.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeOneMember
                 
Number Exercisable (in shares) 51,202us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeOneMember
                 
Weighted Average Exercise Price (in dollars per share) $ 9.26us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeOneMember
                 
Weighted Average Remaining Contractual Life 7 years 10 months 28 days                  
Aggregate Intrinsic Value 0.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeOneMember
                 
10.01 to 15.00 [Member]                    
Options vested and exercisable or nonvested that are expected to vest (nonvested outstanding less expected forfeitures) [Abstract]                    
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 10.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeTwoMember
                 
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 15.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeTwoMember
                 
Number Exercisable (in shares) 384,237us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeTwoMember
                 
Weighted Average Exercise Price (in dollars per share) $ 13.08us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeTwoMember
                 
Weighted Average Remaining Contractual Life 5 years 6 months 25 days                  
Aggregate Intrinsic Value 0.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeTwoMember
                 
15.01 to 20.00 [Member]                    
Options vested and exercisable or nonvested that are expected to vest (nonvested outstanding less expected forfeitures) [Abstract]                    
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 15.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeThreeMember
                 
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 20.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeThreeMember
                 
Number Exercisable (in shares) 529,774us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeThreeMember
                 
Weighted Average Exercise Price (in dollars per share) $ 18.31us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeThreeMember
                 
Weighted Average Remaining Contractual Life 4 years 9 months 7 days                  
Aggregate Intrinsic Value 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeThreeMember
                 
20.01 to 20.15 [Member]                    
Options vested and exercisable or nonvested that are expected to vest (nonvested outstanding less expected forfeitures) [Abstract]                    
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 20.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeFourMember
                 
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 20.15us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeFourMember
                 
Number Exercisable (in shares) 100,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeFourMember
                 
Weighted Average Exercise Price (in dollars per share) $ 20.15us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeFourMember
                 
Weighted Average Remaining Contractual Life 2 years 0 months 22 days                  
Aggregate Intrinsic Value 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeFourMember
                 
5.00 to 20.15 [Member]                    
Options vested and exercisable or nonvested that are expected to vest (nonvested outstanding less expected forfeitures) [Abstract]                    
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 5.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeFiveMember
                 
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 20.15us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeFiveMember
                 
Number Exercisable (in shares) 1,065,213us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeFiveMember
                 
Weighted Average Exercise Price (in dollars per share) $ 16.16us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeFiveMember
                 
Weighted Average Remaining Contractual Life 4 years 11 months 12 days                  
Aggregate Intrinsic Value 0.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= syx_RangeFiveMember
                 
Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share based compensation cost 0.7us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.1us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
2.5us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Share based compensation cost, future income tax benefits 0.2us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0.4us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.4us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Weighted-average assumptions used to estimate the fair value of options granted [Abstract]                    
Expected annual dividend yield (in hundredths) 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Risk-free interest rate (in hundredths) 2.02%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.66%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Expected volatility (in hundredths) 47.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
41.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
57.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Expected life in years 6 years 2 months 12 days 7 years 10 months 24 days 6 years 3 months 18 days              
Outstanding and exercisable options, Weighted Average Shares [Roll Forward]                    
Outstanding at beginning of year (in shares) 1,175,499us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,353,059us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,285,115us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
            1,285,115us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Granted (in shares) 65,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
60,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
772,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Exercised (in shares) (33,749)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(34,310)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(109,466)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Cancelled or expired (in shares) (104,500)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(203,250)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(595,090)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Outstanding at end of year (in shares) 1,102,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,175,499us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,353,059us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Options exercisable at year end (in shares) 839,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
772,749us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
682,809us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Weighted average fair value per option granted during the year (in dollars per share) $ 5.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 4.44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 7.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Outstanding and exercisable options, Weighted Average Exercise Price [Roll Forward]                    
Outstanding at beginning of year (in dollars per share) $ 16.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 15.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 13.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
            13.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Granted (in dollars per share) $ 12.39us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 9.54us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 15.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Exercised (in dollars per share) $ 9.78us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 3.04us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 3.12us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Cancelled or expired (in dollars per share) $ 15.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 14.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 11.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Outstanding at end of year (in dollars per share) $ 16.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 16.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 15.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Weighted average grant date fair value [Roll Forward]                    
Total intrinsic value of options exercised 0.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Unrecognized compensation costs 0.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
                 
Weighted average period of recognition 1 year 8 months 1 day                  
Total fair value of stock options vested 1.2us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.6us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.1us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Restricted Stock Units [Member] | Former Officer and Director [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share based compensation cost 0us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= syx_FormerOfficerAndDirectorMember
0us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= syx_FormerOfficerAndDirectorMember
0us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= syx_FormerOfficerAndDirectorMember
             
Restricted Stock Units [Member] | Key Employee [Member] | Granted October 2011 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share based compensation cost 0us-gaap_ShareBasedCompensation
/ us-gaap_AwardDateAxis
= syx_GrantDateOctober2011Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
0.8us-gaap_ShareBasedCompensation
/ us-gaap_AwardDateAxis
= syx_GrantDateOctober2011Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
0.2us-gaap_ShareBasedCompensation
/ us-gaap_AwardDateAxis
= syx_GrantDateOctober2011Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
             
Restricted Stock Units [Member] | Key Employee [Member] | Granted November 2011 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share based compensation cost 0.2us-gaap_ShareBasedCompensation
/ us-gaap_AwardDateAxis
= syx_GrantDateNovember2011Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
0.2us-gaap_ShareBasedCompensation
/ us-gaap_AwardDateAxis
= syx_GrantDateNovember2011Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
0.4us-gaap_ShareBasedCompensation
/ us-gaap_AwardDateAxis
= syx_GrantDateNovember2011Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
             
Restricted Stock Units [Member] | Two Key Employees [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share based compensation cost 0.3us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= syx_TwoKeyEmployeesFirstGrantMember
0.4us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= syx_TwoKeyEmployeesFirstGrantMember
0.5us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= syx_TwoKeyEmployeesFirstGrantMember
             
Restricted Stock Units [Member] | Director [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share based compensation cost 0.1us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
0.1us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
0.1us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
             
Unvested Stock Options [Member]                    
Activity for all unvested stock options [Roll Forward]                    
Unvested at beginning of the year (in shares) 402,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= syx_UnvestedStockOptionsMember
                 
Granted (in shares) 65,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= syx_UnvestedStockOptionsMember
                 
Vested (in shares) (134,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= syx_UnvestedStockOptionsMember
                 
Forfeited (in shares) (71,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= syx_UnvestedStockOptionsMember
                 
Unvested at end of the year (in shares) 262,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= syx_UnvestedStockOptionsMember
                 
Weighted average grant date fair value [Roll Forward]                    
Unvested at the beginning of the year (in dollars per share) $ 8.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= syx_UnvestedStockOptionsMember
                 
Granted (in dollars per share) $ 5.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= syx_UnvestedStockOptionsMember
                 
Vested (in dollars per share) $ 8.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= syx_UnvestedStockOptionsMember
                 
Forfeited (in dollars per share) $ 7.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= syx_UnvestedStockOptionsMember
                 
Unvested at the end of the year (in dollars per share) $ 8.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= syx_UnvestedStockOptionsMember
                 
Restricted Stock and Restricted Stock Units [Abstract]                    
Granted (in shares) 65,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= syx_UnvestedStockOptionsMember
                 
Vested (in shares) 134,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= syx_UnvestedStockOptionsMember
                 
1995 Long-term Stock Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Term of award 10 years                  
Outstanding and exercisable options, Weighted Average Shares [Roll Forward]                    
Outstanding at end of year (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan1995Member
                 
1995 Stock Option Plan for Non-Employee Directors [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Term of award 10 years                  
Number of shares authorized for issuance (in shares) 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= syx_StockOptionPlanForNonEmployeeDirectors1995Member
                 
1995 Stock Option Plan for Non-Employee Directors [Member] | Stock Options [Member]                    
Outstanding and exercisable options, Weighted Average Shares [Roll Forward]                    
Outstanding at end of year (in shares) 4,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= syx_StockOptionPlanForNonEmployeeDirectors1995Member
                 
1999 Long-term Stock Incentive Plan, as amended [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized for issuance (in shares) 7,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlanAsAmended1999PlanMember
5,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlanAsAmended1999PlanMember
               
Number of shares granted per employee in each calendar year, maximum (in shares) 3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlanAsAmended1999PlanMember
                 
1999 Long-term Stock Incentive Plan, as amended [Member] | Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares granted per employee in each calendar year, maximum (in shares) 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlanAsAmended1999PlanMember
                 
Outstanding and exercisable options, Weighted Average Shares [Roll Forward]                    
Outstanding at end of year (in shares) 558,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlanAsAmended1999PlanMember
                 
1999 Long-term Stock Incentive Plan, as amended [Member] | Restricted Stock Units [Member] | Former Officer and Director [Member]                    
Activity for all unvested stock options [Roll Forward]                    
Granted (in shares)           1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlanAsAmended1999PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_FormerOfficerAndDirectorMember
       
Restricted Stock and Restricted Stock Units [Abstract]                    
Granted (in shares)           1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlanAsAmended1999PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_FormerOfficerAndDirectorMember
       
Non performance award, Vested (in hundredths)       10.00%syx_NonPerformanceAwardVested
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlanAsAmended1999PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_FormerOfficerAndDirectorMember
20.00%syx_NonPerformanceAwardVested
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlanAsAmended1999PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_FormerOfficerAndDirectorMember
         
2006 Stock Incentive Plan For Non-Employee Directors [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized for issuance (in shares) 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= syx_StockIncentivePlanForNonEmployeeDirectors2006Member
                 
2006 Stock Incentive Plan For Non-Employee Directors [Member] | Stock Options [Member]                    
Outstanding and exercisable options, Weighted Average Shares [Roll Forward]                    
Outstanding at end of year (in shares) 15,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= syx_StockIncentivePlanForNonEmployeeDirectors2006Member
                 
2010 Long-term Stock Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized for issuance (in shares) 7,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
                 
2010 Long-term Stock Incentive Plan [Member] | Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares granted per employee in each calendar year, maximum (in shares) 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
                 
Outstanding and exercisable options, Weighted Average Shares [Roll Forward]                    
Outstanding at end of year (in shares) 524,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
                 
2010 Long-term Stock Incentive Plan [Member] | Restricted Stock Units [Member]                    
Outstanding and exercisable options, Weighted Average Shares [Roll Forward]                    
Outstanding at end of year (in shares) 255,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
                 
2010 Long-term Stock Incentive Plan [Member] | Restricted Stock Units [Member] | Key Employee [Member]                    
Activity for all unvested stock options [Roll Forward]                    
Granted (in shares)             100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
   
Vested (in shares)               (90,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
   
Restricted Stock and Restricted Stock Units [Abstract]                    
Granted (in shares)             100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
   
Vested (in shares)               90,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
   
Number of vesting installments             10syx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfVestingInstallments
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
10syx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfVestingInstallments
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
   
Number of units vesting annually (in shares)             10,000syx_NumberOfUnitsVestingAnnually
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
10,000syx_NumberOfUnitsVestingAnnually
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
   
2010 Long-term Stock Incentive Plan [Member] | Restricted Stock Units [Member] | Key Employee [Member] | Granted August 2010 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share based compensation cost $ 0.2us-gaap_ShareBasedCompensation
/ us-gaap_AwardDateAxis
= syx_GrantDateAugust2010Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
$ 0.3us-gaap_ShareBasedCompensation
/ us-gaap_AwardDateAxis
= syx_GrantDateAugust2010Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
$ 0.4us-gaap_ShareBasedCompensation
/ us-gaap_AwardDateAxis
= syx_GrantDateAugust2010Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
             
Activity for all unvested stock options [Roll Forward]                    
Granted (in shares)                 175,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= syx_GrantDateAugust2010Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
 
Restricted Stock and Restricted Stock Units [Abstract]                    
Granted (in shares)                 175,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= syx_GrantDateAugust2010Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
 
Number of vesting installments                 10syx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfVestingInstallments
/ us-gaap_AwardDateAxis
= syx_GrantDateAugust2010Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
 
Number of units vesting annually (in shares)                 17,500syx_NumberOfUnitsVestingAnnually
/ us-gaap_AwardDateAxis
= syx_GrantDateAugust2010Member
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_KeyEmployeeMember
 
2010 Long-term Stock Incentive Plan [Member] | Restricted Stock Units [Member] | Two Key Employees [Member]                    
Activity for all unvested stock options [Roll Forward]                    
Granted (in shares)                   50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_TwoKeyEmployeesFirstGrantMember
Restricted Stock and Restricted Stock Units [Abstract]                    
Granted (in shares)                   50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_TwoKeyEmployeesFirstGrantMember
Number of vesting installments                   10syx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfVestingInstallments
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_TwoKeyEmployeesFirstGrantMember
Number of units vesting annually (in shares)                   10,000syx_NumberOfUnitsVestingAnnually
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= syx_LongTermStockIncentivePlan2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= syx_TwoKeyEmployeesFirstGrantMember