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Organization and Basis of Presentation (Fiscal Year) (Details) - weeks | 12 Months Ended
--- | ---
Jan. 28, 2018 | Jan. 29, 2017 | Jan. 31, 2016
Fiscal Year [Line Items] |  |  |
Number of weeks in reporting period | 52 | 52 | 53
Minimum |  |  |
Fiscal Year [Line Items] |  |  |
Number of weeks in reporting period | 52 |  |
Maximum |  |  |
Fiscal Year [Line Items] |  |  |
Number of weeks in reporting period | 53 |  |

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- Definition [Line Items] for Fiscal Year [Table] + References No definition available. + Details
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Namespace Prefix: | smtc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Weeks in Reporting Period + References No definition available. + Details
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Namespace Prefix: | smtc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |