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Acquisitions - Schedule of Purchase Price Allocation (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 25, 2015
Jan. 26, 2014
Jan. 27, 2013
Oct. 28, 2012
Mar. 20, 2012
Business Acquisition [Line Items]          
Goodwill $ 280,319us-gaap_Goodwill $ 276,898us-gaap_Goodwill $ 393,584us-gaap_Goodwill    
Gennum          
Business Acquisition [Line Items]          
Cash         19,664us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Accounts receivable, less allowances         14,032us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Inventories         62,941us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Prepaid expenses         3,832us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Income taxes receivable         1,467smtc_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsIncomeTaxesReceivable
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Deferred tax assets - current         8,590us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Other current assets         7,804us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Property, plant and equipment         25,702us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Amortizable intangible assets         129,863us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
In-process research and development         29,100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Goodwill     261,900us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
262,800us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
261,891us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Deferred tax assets - non-current         31,235us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Other non-current assets         8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Deferred tax liabilities         (47,077)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Accounts payable         (18,232)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Accrued liabilities         (24,274)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Total acquisition consideration         506,546us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
Gennum | Developed technology          
Business Acquisition [Line Items]          
Amortizable intangible assets         95,100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Gennum | Customer relationships          
Business Acquisition [Line Items]          
Amortizable intangible assets         28,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Gennum | Other intangible assets          
Business Acquisition [Line Items]          
Amortizable intangible assets         $ 6,763us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= smtc_GennumMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember