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Goodwill and Intangible Assets - Estimated Fair Values of Reporting Units, Discounted Cash Flow Inputs (Details) (Goodwill, Income approach)
 1 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Discounted Cash Flow Inputs [Line Items]    
Perpetual growth rate 3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate 3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
Risk-free rate 2.60%smtc_FairValueInputsRiskFreeRate 3.50%smtc_FairValueInputsRiskFreeRate
Minimum
    
Discounted Cash Flow Inputs [Line Items]    
Discount rate 12.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember		 11.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
Tax rate 10.10%smtc_FairValueInputsTaxRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember		 13.40%smtc_FairValueInputsTaxRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
Peer company beta 1.0smtc_FairValueInputsPeerCompanyBeta
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember		 1.0smtc_FairValueInputsPeerCompanyBeta
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
Maximum
    
Discounted Cash Flow Inputs [Line Items]    
Discount rate 15.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember		 14.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
Tax rate 28.10%smtc_FairValueInputsTaxRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember		 18.00%smtc_FairValueInputsTaxRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
Peer company beta 1.8smtc_FairValueInputsPeerCompanyBeta
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember		 1.5smtc_FairValueInputsPeerCompanyBeta
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember