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SUBSEQUENT EVENTS (unaudited) (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 0 Months Ended
Mar. 31, 2015
Jan. 30, 2015
Subsequent Event [Line Items]    
Severance expenses $ 4us-gaap_SeveranceCosts1  
Lease exit costs 39us-gaap_BusinessExitCosts1  
Subsequent Event [Member] | TAKKT America [Member]    
Subsequent Event [Line Items]    
Cash paid for acquisition   25.9us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= syx_TAKKTAmericaMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event [Member] | Minimum [Member]    
Subsequent Event [Line Items]    
Anticipated restructuring charges 50syx_AnticipatedRestructuringCharges
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Subsequent Event [Member] | Maximum [Member]    
Subsequent Event [Line Items]    
Anticipated restructuring charges $ 55syx_AnticipatedRestructuringCharges
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember