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Stock-Based Compensation (Summary Of The Activity For Restricted Shares Awards) (Details) (Restricted Stock [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Oct. 30, 2011
years
Restricted Stock [Member]
 
Number of Shares  
Beginning balance 135
Restricted stock vested (76)
Restricted stock forfeited (12)
Ending balance 47
Weighted Averaged Grant Date Fair Value (per share)  
Beginning balance $ 14.44
Restricted stocks vested $ 13.99
Restricted stocks forfeited $ 15.25
Ending balance $ 14.99
Aggregate Intrinsic Value  
Restricted stocks vested $ 1,853 [1]
Aggregate Unrecognized Compensation  
Beginning balance 984
Ending balance $ 209
Weighted Average Period Over Which Expected to be Recognized (in years)  
Beginning balance 0.8
Ending balance 0.3
[1] Represents the value of Semtech stock on the date that the restricted stock vested.