XML 66 R51.htm IDEA: XBRL DOCUMENT
v3.8.0.1

COMMITMENTS, CONTINGENCIES AND OTHER MATTERS - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) officer state | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |
Number of principal shareholders and senior executive officers | officer | 3 |  |
Annual rent expense | $ 13.5 | $ 17.7 | $ 26.4
Related party rent expense | 0.9 | 0.9 | 1.0
Rent expense net of sublease income | $ 0.4 | 0.4 | 0.1
Number of states seeking recovery of unclaimed property | state | 21 |  |
NATG |  |  |
Loss Contingencies [Line Items] |  |  |
Annual rent expense | $ 0.8 | $ 5.2 | $ 14.2

X
- Definition The number of principal shareholders and senior executive officers. + References No definition available. + Details
Name: | syx_NumberOfPrincipalShareholdersAndSeniorExecutiveOfficers
Namespace Prefix: | syx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of states being audited and seeking recovery of unclaimed property. + References No definition available. + Details
Name: | syx_NumberOfStatesSeekingRecoveryOfUnclaimedProperty
Namespace Prefix: | syx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Rental expense incurred for leased assets in a related party transactions. + References No definition available. + Details
Name: | syx_RentExpenseRelatedParty
Namespace Prefix: | syx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
Name: | us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=syx_NorthAmericanTechnologyProductsSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |