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CREDIT FACILITIES (Details) - Secured Revolving Credit Facility | 12 Months Ended
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Dec. 31, 2018 USD ($) financial_institution
Line of Credit Facility [Line Items] |
Secured revolving credit agreement, maximum borrowing capacity | $ 75,000,000
Number of financial institutions | financial_institution | 1
Term of credit facility | 5 years
Percentage of inventory advance rate computed | 60.00%
Percentage of inventory advance rate of net orderly liquidation value | 85.00%
Eligible collateral under the credit facility | $ 75,000,000
Availability under line of credit | 73,400,000
Total outstanding letters of credit | 2,300,000
Excess availability letters of credit | 71,100,000
Outstanding borrowings | $ 0
Maximum |
Line of Credit Facility [Line Items] |
Percentage of eligible accounts receivable for borrowings | 85.00%

X
- Definition Refers to the amount of eligible collateral letters of credit, based on borrowing base availability. + References No definition available. + Details
Name: | syx_EligibleCollateralUnderTheCreditFacility
Namespace Prefix: | syx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number Of Financial Institutions + References No definition available. + Details
Name: | syx_NumberOfFinancialInstitutions
Namespace Prefix: | syx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to the amount of outstanding advances. + References No definition available. + Details
Name: | syx_OutstandingAdvances
Namespace Prefix: | syx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage of eligible accounts receivable for borrowings under the agreement. + References No definition available. + Details
Name: | syx_PercentageOfEligibleAccountsReceivableForBorrowings
Namespace Prefix: | syx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to percentage of inventory advance rate computed as the lesser of NOVL (Net Orderly Liquidation Value). + References No definition available. + Details
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Namespace Prefix: | syx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to percentage of inventory advance rate computed of NOVL (Net Orderly Liquidation Value). + References No definition available. + Details
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Namespace Prefix: | syx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Period Type: |