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Share-Based Compensation - Summary of Activity for Warrants (Details) - USD ($)
9 Months Ended
Oct. 30, 2016
Jan. 31, 2016
Aggregate Intrinsic Value    
Aggregate intrinsic value of warrant shares outstanding [1]   $ 0
Aggregate Unrecognized Compensation    
Change in value $ 23,674,000  
Warrant [Member]    
Units    
Beginning balance (in shares) 0  
Warrants shares granted (in shares) 1,087,000  
Warrants shares vested (in shares) (109,000)  
Ending balance (in shares) 978,000  
Weighted Averaged Grant Date Fair Value (per unit)    
Beginning balance $ 0  
Warrant shares granted (in dollars per share) 27.74  
Warrant shares vested (in dollars per share) 27.74  
Ending balance $ 27.74  
Aggregate Intrinsic Value    
Aggregate intrinsic value of warrant shares vested [1] $ 3,015,000  
Aggregate Unrecognized Compensation    
Beginning balance 0  
Ending balance $ 23,674,000  
[1] Reflects the value of Semtech Corporation Warrant Shares on the date the Warrant Shares vested.