XML 128 R1.htm IDEA: XBRL DOCUMENT v3.20.1
Cover Page - USD ($)
$ in Billions
 12 Months Ended
Jan. 26, 2020
Mar. 18, 2020
Jul. 28, 2019
Cover page.      
Document Annual Report true    
Document Type 10-K    
Document Period End Date Jan. 26, 2020    
Document Transition Report false    
Contained File Information, File Number 001-06395    
Entity Registrant Name SEMTECH CORP    
Entity Incorporation, State or Country Code DE    
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    
Title of 12(b) Security Common Stock par value $0.01 per share    
Trading Symbol SMTC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 2.6
Entity Common Stock, Shares Outstanding   65,795,172  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant’s Proxy Statement in connection with registrant’s annual meeting of stockholders to be held on June 11, 2020 to be filed with the Securities and Exchange Commission no later than 120 days after the end of the registrant’s fiscal year ended January 26, 2020 are incorporated by reference into Part III hereof.
    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000088941    
Current Fiscal Year End Date --01-26