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COMMITMENTS, CONTINGENCIES AND OTHER MATTERS (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Officers | Dec. 31, 2013 | Dec. 31, 2012
COMMITMENTS, CONTINGENCIES AND OTHER MATTERS [Abstract] |  |  |
Number of principal shareholders and senior executive officers | 3 syx_NumberOfPrincipalShareholdersAndSeniorExecutiveOfficers |  |
Capital Leases [Abstract] |  |  |
2015 | $ 2.8 us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent |  |
2016 | 0.6 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears |  |
2017 | 0.3 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears |  |
2018 | 0 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears |  |
2019 | 0 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears |  |
2020-2024 | 0 syx_CapitalLeasesFutureMinimumPaymentsDueInSixthToTenthYears |  |
2025-2029 | 0 syx_CapitalLeasesFutureMinimumPaymentsDueInEleventhToFifteenthYears |  |
Thereafter | 0 us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter |  |
Total minimum lease payments | 3.7 us-gaap_CapitalLeasesFutureMinimumPaymentsDue |  |
Less: sublease rental income | 0 us-gaap_CapitalLeasesFutureMinimumSubleaseRentals |  |
Lease obligation net of subleases | 3.7 syx_CapitalLeaseLeaseObligationNetOfSubleasesNet |  |
Less amount representing interest | 0.1 syx_CapitalLeaseAmountRepresentingInterest |  |
Present value of minimum capital lease payments (including current portion of 2.7) | 3.6 us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
2015 | 28.3 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |
2016 | 26.4 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |
2017 | 26.0 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |
2018 | 21.4 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |
2019 | 19.1 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears |  |
2020-2024 | 51.7 syx_OperatingLeasesFutureMinimumPaymentsDueInSixthToTenthYears |  |
2025-2029 | 25.6 syx_OperatingLeasesFutureMinimumPaymentsDueInEleventhToFifteenthYears |  |
Thereafter | 8.0 syx_OperatingLeasesFutureMinimumPaymentsDueAfterFifteenthYear |  |
Total minimum lease payments | 206.5 us-gaap_OperatingLeasesFutureMinimumPaymentsDue |  |
Less: sublease rental income | 2.5 us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals |  |
Lease obligation net of subleases | 204.0 syx_OperatingLeasesLeaseObligationNetOfSubleases |  |
Total lease [Abstract] |  |  |
2015 | 31.1 syx_TotalLeaseFutureMinimumPaymentsDueNextTwelveMonths |  |
2016 | 27.0 syx_TotalLeasesFutureMinimumPaymentsDueInTwoYears |  |
2017 | 26.3 syx_TotalLeasesFutureMinimumPaymentsDueInThreeYears |  |
2018 | 21.4 syx_TotalLeasesFutureMinimumPaymentsDueInFourYears |  |
2019 | 19.1 syx_TotalLeasesFutureMinimumPaymentsDueInFiveYears |  |
2020-2024 | 51.7 syx_TotalLeasesFutureMinimumPaymentsDueInSixthToTenthYears |  |
2025-2029 | 25.6 syx_TotalLeasesFutureMinimumPaymentsDueInEleventhToFifteenthYears |  |
Thereafter | 8.0 syx_TotalLeasesFutureMinimumPaymentsDueThereafter |  |
Total minimum lease payments | 210.2 syx_TotalLeasesFutureMinimumPaymentsDue |  |
Less: sublease rental income | 2.5 syx_TotalLeaseSubleaseRentalIncome |  |
Lease obligation net of subleases | 207.7 syx_TotalLeasesLeaseObligationNetOfSubleases |  |
Annual rent expense | 31.5 us-gaap_LeaseAndRentalExpense | 34.6 us-gaap_LeaseAndRentalExpense | 33.4 us-gaap_LeaseAndRentalExpense
Related party rent expense | 0.9 syx_RentExpenseRelatedParty | 0.9 syx_RentExpenseRelatedParty | 0.9 syx_RentExpenseRelatedParty
Rent expense net of sublease income | $ 0 us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 | $ 0.1 us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 | $ 0.2 us-gaap_OperatingLeasesRentExpenseSubleaseRentals1

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- Definition Amount of minimum lease payments for capital leases due in the eleventh to fifteenth fiscal years following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of required minimum rental payments maturing after the fifteenth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References No definition available. + Details
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- Definition Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: 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
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