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Stock-Based Compensation - Summary of the Activity for Restricted Stock Awards (Details) (Restricted stock, USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Jan. 27, 2013
Jan. 29, 2012
Jan. 30, 2011
Jan. 31, 2010
Restricted stock
       
Number of Shares        
Beginning balance (in shares) 32 135 418  
Restricted stocks granted (in shares) 0 0 0  
Restricted stocks vested (in shares) (32) (91) (270)  
Restricted stocks cancelled (in shares) 0 (12) (13)  
Ending balance (in shares) 0 32 135 418
Weighted Average Grant Date Fair Value (per share)        
Beginning balance (in dollars per share) $ 14.57 $ 14.44 $ 15.15  
Restricted stocks vested (in dollars per share) $ 14.57 $ 14.29 $ 17.33  
Restricted stocks cancelled (in dollars per share)   $ 15.25 $ 17.44  
Ending balance (in dollars per share) $ 0.00 $ 14.57 $ 14.44 $ 15.15
Aggregate Intrinsic Value        
Restricted stocks vested $ 902 [1] $ 2,201 [1] $ 4,678 [1]  
Aggregate Unrecognized Compensation        
Beginning balance 81 984 3,193  
Ending balance $ 0 $ 81 $ 984 $ 3,193
Weighted Average Period Over Which Expected to be Recognized (in years)        
Ending Balance 0 years 0 years 1 month 6 days 0 years 9 months 18 days 1 year 2 months 12 days
[1] Represents the value of Semtech stock on the date that the restricted stock vested.