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Basis of Presentation (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Basis of Presentation [Abstract]
Number of weeks in fiscal period, minimum (in weeks)	52		52
Number of weeks in fiscal period, maximum (in weeks)	53		53
Number of weeks in first quarter (in weeks)	13	13
Number of weeks year to date (in weeks)			39	39

X

- Definition

Refers to maximum number of weeks in fiscal period to manage entities business and its reporting.

+ References

No definition available.

+ Details

Name:	syx_NumberOfWeeksInFiscalPeriodMaximum
Namespace Prefix:	syx_
Data Type:	invest:dateStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Refers to minimum number of weeks in fiscal period to manage entities business and its reporting.

+ References

No definition available.

+ Details

Name:	syx_NumberOfWeeksInFiscalPeriodMinimum
Namespace Prefix:	syx_
Data Type:	invest:dateStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Refers to number of weeks in quarter fiscal period to manage entities business and its reporting.

+ References

No definition available.

+ Details

Name:	syx_NumberOfWeeksInQuarterFiscalPeriod
Namespace Prefix:	syx_
Data Type:	invest:dateStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Refers to the number of weeks year to date of the fiscal period to manage the entity's business and reporting.

+ References

No definition available.

+ Details

Name:	syx_NumberOfWeeksYearToDate
Namespace Prefix:	syx_
Data Type:	invest:dateStringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration