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Stock-Based Compensation - Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 0 Months Ended
Apr. 26, 2015
Feb. 26, 2014
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Potential per share consideration due upon change in control $ 40.00smtc_Potentialpershareconsiderationdueuponchangeincontrol
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Stock options [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Stock options [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 4 years  
Employee restricted stock unit awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 4 years  
Non-employee director stock unit awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 1 year  
Vested but unsettled stock units 202,780smtc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnsettledUnits
/ us-gaap_AwardTypeAxis
= smtc_NonEmployeeDirectorStockUnitAwardsMember		  
Individuals Not Associated With EnVery Transaction [Member] | Performance shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Performance condition, highest potential performance level 200.00%smtc_Sharebasedcompensationarrangementperformanceconditionhighestpotentialperformancelevel
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= smtc_IndividualsNotAssociatedWithEnVeryTransactionMember		  
Maximum number of shares which would be settled in shares 547,032smtc_MaximumNumberofSharesWhichWouldBeSettledinShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= smtc_IndividualsNotAssociatedWithEnVeryTransactionMember		  
Maximum number of shares which would be settled in cash 547,032smtc_MaximumNumberOfSharesWhichWouldBeSettledInCash
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= smtc_IndividualsNotAssociatedWithEnVeryTransactionMember		  
Target performance metrics for performance unit awards, fiscal year 2016 100.00%smtc_ShareBasedCompensationArrangementGrantsInPeriodPercentageWithinCurrentYear
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= smtc_IndividualsNotAssociatedWithEnVeryTransactionMember		  
Target performance metrics for performance unit awards, fiscal year 2015 95.00%smtc_ShareBasedCompensationArrangementGrantsInPeriodPercentageWithinPreviousYear
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= smtc_IndividualsNotAssociatedWithEnVeryTransactionMember		  
Target performance metrics for performance unit awards, fiscal year 2014 75.00%smtc_ShareBasedCompensationArrangementGrantsInPeriodPercentageWithinTwoPriorFiscalYears
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= smtc_IndividualsNotAssociatedWithEnVeryTransactionMember		  
Individuals Associated With EnVery Transaction [Member] | Performance shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 4 years  
Performance condition, highest potential performance level 100.00%smtc_Sharebasedcompensationarrangementperformanceconditionhighestpotentialperformancelevel
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= smtc_IndividualsAssociatedWithEnVeryTransactionMember		  
Maximum number of shares which would be settled in shares 54,000smtc_MaximumNumberofSharesWhichWouldBeSettledinShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= smtc_IndividualsAssociatedWithEnVeryTransactionMember		  
Award vesting percentage 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= smtc_IndividualsAssociatedWithEnVeryTransactionMember		  
CEO [Member] | Market Performance Units, Tranche 1 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting percentage   30.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= smtc_MarketPerformanceUnitsTranche1Member
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
Award performance period   120 days
CEO [Member] | Market Performance Units, Tranche 1 [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average per share closing price used to determine vesting rights (in dollars per share)   35.00smtc_SharebasedCompensationArrangementbySharebasedPaymentAwardTargetSharePriceRequiredforVestingofShares
/ us-gaap_AwardTypeAxis
= smtc_MarketPerformanceUnitsTranche1Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
CEO [Member] | Market Performance Units, Tranche 2 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award performance period   120 days
CEO [Member] | Market Performance Units, Tranche 2 [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average per share closing price used to determine vesting rights (in dollars per share)   40.00smtc_SharebasedCompensationArrangementbySharebasedPaymentAwardTargetSharePriceRequiredforVestingofShares
/ us-gaap_AwardTypeAxis
= smtc_MarketPerformanceUnitsTranche2Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
Accrued Liabilities [Member] | Non-employee director stock unit awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation liability, current $ 0.5us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent
/ us-gaap_AwardTypeAxis
= smtc_NonEmployeeDirectorStockUnitAwardsMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember