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Segment Information Net Sales Activity by Segment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 26, 2015
Apr. 27, 2014
Revenue from External Customer [Line Items]    
Net sales $ 130,088us-gaap_SalesRevenueNet $ 132,859us-gaap_SalesRevenueNet
Semiconductor Products Group [Member]    
Revenue from External Customer [Line Items]    
Net sales 128,247us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= smtc_SemiconductorProductsGroupMember		 131,743us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= smtc_SemiconductorProductsGroupMember
All others [Member]    
Revenue from External Customer [Line Items]    
Net sales $ 1,841us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 $ 1,116us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember