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Leases - Narrative (Details)	6 Months Ended
	Jul. 26, 2020
Leases [Abstract]
Remaining lease term–operating leases	10 years
Maximum renewal term	5 years
Termination period	1 year

X

- Definition

Lessee, Operating Lease, Termination Period

+ References

No definition available.

+ Details

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Namespace Prefix:	smtc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Operating Lease, Remaining Lease Term

+ References

No definition available.

+ Details

Name:	smtc_OperatingLeaseRemainingLeaseTerm
Namespace Prefix:	smtc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant