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Organization and Basis of Presentation - Fiscal Year (Details)	12 Months Ended
	Jan. 25, 2026 wk
Minimum
Fiscal Year [Line Items]
Number of weeks in reporting period	52
Maximum
Fiscal Year [Line Items]
Number of weeks in reporting period	53

X

- Definition

[Line Items] for Fiscal Year [Table]

+ References

No definition available.

+ Details

Name:	smtc_FiscalYearLineItems
Namespace Prefix:	smtc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of Weeks in Reporting Period

+ References

No definition available.

+ Details

Name:	smtc_NumberofWeeksinReportingPeriod
Namespace Prefix:	smtc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: