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Cover Page
 12 Months Ended
Jun. 03, 2025
Jan. 25, 2026
Cover [Abstract]    
Document Type 8-K  
Document Period End Date Jun. 03, 2025  
Entity Registrant Name SEMTECH CORP  
Entity Incorporation, State or Country Code DE  
Entity File Number 001-06395  
Entity Tax Identification Number 95-2119684  
Entity Address, Address Line One 200 Flynn Road  
Entity Address, City or Town Camarillo,  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 93012-8790  
City Area Code 805  
Local Phone Number 498-2111  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol SMTC  
Security Exchange Name NASDAQ  
Entity Emerging Growth Company false  
Amendment Flag false  
Entity Central Index Key 0000088941  
Current Fiscal Year End Date   --01-25