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Subsequent Event (Details) (Triune Systems [Member], Business Acquisition [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended
Mar. 04, 2015
Triune Systems [Member] | Business Acquisition [Member]
 
Subsequent Event [Line Items]  
Aggregate purchase price to acquire business $ 45.0us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= smtc_TriuneSystemsMember
/ us-gaap_SubsequentEventTypeAxis
= smtc_BusinessAcquisitionMember
Cash paid at closing to acquire businesses 35.0us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= smtc_TriuneSystemsMember
/ us-gaap_SubsequentEventTypeAxis
= smtc_BusinessAcquisitionMember
Additional cash to be paid in six months to acquire business $ 10.0smtc_AdditionalCashtobePaidtoAcquireBusiness
/ us-gaap_BusinessAcquisitionAxis
= smtc_TriuneSystemsMember
/ us-gaap_SubsequentEventTypeAxis
= smtc_BusinessAcquisitionMember