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Product Warranties - Additional Information (Detail)	12 Months Ended
	Sep. 27, 2019
Guarantees [Abstract]
Term of product warranties	12 months

X

- Definition

Products warranty period.

+ References

No definition available.

+ Details

Name:	mtsi_ProductsWarrantyPeriod
Namespace Prefix:	mtsi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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