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NATURE OF OPERATIONS AND ACCOUNTING POLICIES. (Details 2) (Net sales)
12 Months Ended
Dec. 27, 2014
item
One customer
 
Concentration of Credit Risk  
Number of significant customers 1sts_ConcentrationRiskNumberOfSignificantCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_MajorCustomersAxis
= sts_OneSignificantCustomerMember
Customer concentration risk
 
Concentration of Credit Risk  
Concentration risk (as a percent) 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember