XML 22 R124.htm IDEA: XBRL DOCUMENT v2.4.1.9
Segment Information Long-lived Assets by Region (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 25, 2015
Jan. 26, 2014
Geographic Information And Concentration Of Risk [Line Items]    
Long-lived assets $ 115,471us-gaap_NoncurrentAssets $ 110,121us-gaap_NoncurrentAssets
United States    
Geographic Information And Concentration Of Risk [Line Items]    
Long-lived assets 63,449us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US		 55,303us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US
Rest of North America [Member]    
Geographic Information And Concentration Of Risk [Line Items]    
Long-lived assets 25,139us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= smtc_RestofNorthAmericaMember		 28,577us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= smtc_RestofNorthAmericaMember
Europe    
Geographic Information And Concentration Of Risk [Line Items]    
Long-lived assets 9,119us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 14,900us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Asia and All Others    
Geographic Information And Concentration Of Risk [Line Items]    
Long-lived assets $ 17,764us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= smtc_AsiaandAllOthersMember		 $ 11,341us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= smtc_AsiaandAllOthersMember