XML 33 R89.htm IDEA: XBRL DOCUMENT v2.4.1.9
Stock-Based Compensation - Narrative (Details) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 19, 2014
Jan. 25, 2015
Jan. 26, 2014
Jan. 27, 2013
Feb. 26, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Tax benefit realized from option exercise activity   $ 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions $ 12,800,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions $ 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions  
Potential per share consideration due upon change in control   $ 40.00smtc_SharebasedCompensationArrangementbySharebasedPaymentAwardPotentialPerShareConsiderationDueUponChangeinControl      
Number of employees affected by modification of awards 12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationNumberOfEmployeesAffected        
Incremental cost related to modification of awards   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost      
Performance unit awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
The maximum number of shares earned for performance unit awards   854,064smtc_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesThatCanBeEarned
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		      
Remaining value of shares which would be settled in cash   427,032smtc_RemainingNumberOfSharesWhichWouldBeSettledInCash
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		      
Percentage of units granted in fiscal year 2013 vested   0.00%smtc_PercentageofUnitsGrantedinFiscalYear2013Vested
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		      
Percentage of units granted in fiscal year 2015 vested   95.00%smtc_PercentageofUnitsGrantedinCurrentFiscalYearExpectedtoVest
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		      
Percentage of units granted in fiscal year 2014 vested   75.00%smtc_ShareBasedCompensationArrangementGrantsInPeriodPercentageWithinNextYear
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		      
Employee stock unit awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   4 years      
Non-employee director stock unit awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   1 year      
Change in liability   1,233,000smtc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsChangeInLiabilitiesInPeriod
/ us-gaap_AwardTypeAxis
= smtc_NonEmployeeDirectorStockUnitAwardsMember		 (576,000)smtc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsChangeInLiabilitiesInPeriod
/ us-gaap_AwardTypeAxis
= smtc_NonEmployeeDirectorStockUnitAwardsMember		 684,000smtc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsChangeInLiabilitiesInPeriod
/ us-gaap_AwardTypeAxis
= smtc_NonEmployeeDirectorStockUnitAwardsMember		  
Vested but unsettled stock units   179,092smtc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnsettledUnits
/ us-gaap_AwardTypeAxis
= smtc_NonEmployeeDirectorStockUnitAwardsMember		      
Minimum | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Minimum | Restricted stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Maximum | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   4 years      
Maximum | Restricted stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   4 years      
Maximum | Performance unit awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
The maximum number of shares issued for performance unit awards   427,032us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Subject to Cash Settlement | Performance unit awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Change in liability   $ 586,000smtc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsChangeInLiabilitiesInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ smtc_AwardTypeTypeOfSettlementAxis
= smtc_SubjectToCashSettlementMember		 $ (3,117,000)smtc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsChangeInLiabilitiesInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ smtc_AwardTypeTypeOfSettlementAxis
= smtc_SubjectToCashSettlementMember		 $ 2,560,000smtc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsChangeInLiabilitiesInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ smtc_AwardTypeTypeOfSettlementAxis
= smtc_SubjectToCashSettlementMember		  
Chief Executive Officer [Member] | Market Performance RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance period during which the award is eligible to vest         commencing February 26, 2014 and ending February 26, 2019
Chief Executive Officer [Member] | Tranche One | Market Performance RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of awards that will vest if market performance condition is met         30.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember
Period used to determine market performance condition         any consecutive 120 calendar day period that commences and ends during the Performance Period
Minimum closing share price used to determine market condition         35.00smtc_SharebasedCompensationArrangementbySharebasedPaymentAwardMinimumClosingSharePriceUsedtoDetermineMarketCondition
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember
Chief Executive Officer [Member] | Tranche Two | Market Performance RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of awards that will vest if market performance condition is met         100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Period used to determine market performance condition         any consecutive 120 calendar day period that commences and ends during the Performance Period
Minimum closing share price used to determine market condition         40.00smtc_SharebasedCompensationArrangementbySharebasedPaymentAwardMinimumClosingSharePriceUsedtoDetermineMarketCondition
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember