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Subsequent Events (Details) - USD ($) $ in Millions	Mar. 11, 2021	Jan. 31, 2021
Subsequent Event [Line Items]
Remaining authorization under stock repurchase program		$ 39.2
Subsequent Event
Subsequent Event [Line Items]
Stock repurchase program, increase in authorized amount	$ 350.0
Remaining authorization under stock repurchase program	$ 389.2

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- Definition

Stock Repurchase Program, Increase In Authorized Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	smtc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

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- Details

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Namespace Prefix:
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