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Concentration of Risk - Schedule of Significant Customers Accounting for at Least 10% of Net Sales (Details) (Net sales revenue)
 12 Months Ended
Jan. 25, 2015
Jan. 26, 2014
Jan. 27, 2013
Geographic Information And Concentration Of Risk [Line Items]      
Concentration risk, percentage 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1
Minimum concentration risk threshold 10.00%smtc_ConcentrationRiskMinimumConcentrationRiskThresholdPercentage    
Samsung Electronics Co., Ltd.(and affiliates)
      
Geographic Information And Concentration Of Risk [Line Items]      
Concentration risk, percentage 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= smtc_SamsungElectronicsAndAffiliatesMember		 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= smtc_SamsungElectronicsAndAffiliatesMember		 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= smtc_SamsungElectronicsAndAffiliatesMember
Huawei Technologies (and affiliates)
      
Geographic Information And Concentration Of Risk [Line Items]      
Concentration risk, percentage 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= smtc_HuaweiTechnologiesCoMember		 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= smtc_HuaweiTechnologiesCoMember		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= smtc_HuaweiTechnologiesCoMember