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Reorganization Costs (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 25, 2015
Jan. 26, 2014
Reorganization Costs [Roll Forward]    
Beginning balance $ 481smtc_PostAcquisitionReorganizationCostAccrual $ 1,330smtc_PostAcquisitionReorganizationCostAccrual
Cash payments (237)smtc_PostAcquisitionReorganizationCostsPayments (849)smtc_PostAcquisitionReorganizationCostsPayments
Ending balance $ 244smtc_PostAcquisitionReorganizationCostAccrual $ 481smtc_PostAcquisitionReorganizationCostAccrual