    <SEC-DOCUMENT>0000088941-24-000043-index.html : 20240426
    <SEC-HEADER>0000088941-24-000043.hdr.sgml : 20240426
    <ACCEPTANCE-DATETIME>20240426163910
    ACCESSION NUMBER:		0000088941-24-000043
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		25
    CONFORMED PERIOD OF REPORT:	20240128
    FILED AS OF DATE:		20240426
    DATE AS OF CHANGE:		20240426

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			SEMTECH CORP
    		CENTRAL INDEX KEY:			0000088941
    		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
    		ORGANIZATION NAME:           	04 Manufacturing
    		IRS NUMBER:				952119684
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			0128

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-06395
    		FILM NUMBER:		24884570

    	BUSINESS ADDRESS:
    		STREET 1:		200 FLYNN ROAD
    		CITY:			CAMARILLO
    		STATE:			CA
    		ZIP:			93012-8790
    		BUSINESS PHONE:		8054982111

    	MAIL ADDRESS:
    		STREET 1:		200 FLYNN ROAD
    		CITY:			CAMARILLO
    		STATE:			CA
    		ZIP:			93012-8790
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>smtc-20240426.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: smtc-20240426.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>2
    <FILENAME>smtc-20240426.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 2 - file: smtc-20240426.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>3
    <FILENAME>smtc-20240426_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
    <TEXT>
    Document 3 - file: smtc-20240426_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>4
    <FILENAME>smtc-20240426_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 4 - file: smtc-20240426_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>5
    <FILENAME>smtc-20240426_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 5 - file: smtc-20240426_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>smtc-20240426_g1.jpg
    <TEXT>
    Document 6 - file: smtc-20240426_g1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>smtc-20240426_g10.jpg
    <TEXT>
    Document 7 - file: smtc-20240426_g10.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>smtc-20240426_g11.jpg
    <TEXT>
    Document 8 - file: smtc-20240426_g11.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>smtc-20240426_g2.jpg
    <TEXT>
    Document 9 - file: smtc-20240426_g2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>smtc-20240426_g3.jpg
    <TEXT>
    Document 10 - file: smtc-20240426_g3.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>smtc-20240426_g4.jpg
    <TEXT>
    Document 11 - file: smtc-20240426_g4.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>smtc-20240426_g5.jpg
    <TEXT>
    Document 12 - file: smtc-20240426_g5.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>smtc-20240426_g6.jpg
    <TEXT>
    Document 13 - file: smtc-20240426_g6.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>smtc-20240426_g7.jpg
    <TEXT>
    Document 14 - file: smtc-20240426_g7.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>smtc-20240426_g8.jpg
    <TEXT>
    Document 15 - file: smtc-20240426_g8.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>smtc-20240426_g9.jpg
    <TEXT>
    Document 16 - file: smtc-20240426_g9.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>18
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 18 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>19
    <FILENAME>R2.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 19 - file: R2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>20
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 20 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>21
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 21 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>23
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 23 - file: FilingSummary.html

    Document 23 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>25
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 25 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>26
    <FILENAME>0000088941-24-000043-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 26 - file: 0000088941-24-000043-xbrl.zip

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>28
    <FILENAME>smtc-20240426_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 28 - file: smtc-20240426_htm.html

    Document 28 - RAW XML: smtc-20240426_htm.xml

    </DOCUMENT>
    </SEC-DOCUMENT>