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Concentration of Risk - Narrative (Details)
 12 Months Ended
Jan. 25, 2015
Jan. 26, 2014
Jan. 27, 2013
Accounts receivable      
Minimum concentration risk threshold 10.00%smtc_ConcentrationRiskMinimumConcentrationRiskThresholdPercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember		    
Net sales revenue      
Minimum concentration risk threshold 10.00%smtc_ConcentrationRiskMinimumConcentrationRiskThresholdPercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember		    
Concentration risk, percentage 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember		 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember		 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
Authorized distributors [Member] | Net sales revenue      
Concentration risk, percentage 56.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= smtc_AuthorizeddistributorsMember		    
Supplier concentration risk [Member] | Cost of silicon wafers [Member]      
Concentration risk, percentage 37.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= smtc_CostofSiliconWafersMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember		 38.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= smtc_CostofSiliconWafersMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember		 38.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= smtc_CostofSiliconWafersMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember