Basis of Presentation (Details)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Schedule of Weeks in Period [Line Items]
Number of weeks	13	13
Minimum [Member]
Schedule of Weeks in Period [Line Items]
Number of weeks	52
Maximum [Member]
Schedule of Weeks in Period [Line Items]
Number of weeks	53

Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

No definition available.

Name:	syx_FiscalPeriodDurationWeeks
Namespace Prefix:	syx_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration