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Product Warranties - Schedule of Product Warranty Liability Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance — beginning of year	$ 5,756	$ 3,672	$ 1,039
(Divested)/acquired	0	(49)	952
Provisions/(expense)	(3,053)	1,865	1,737
Direct charges/(payments)	570	268	(56)
Balance — end of year	$ 3,273	$ 5,756	$ 3,672

X

- Definition

Standard and Extended Product Warranty Accrual, Increase (Decrease) For Additions From Business Acquisition And Divestitures

+ References

No definition available.

+ Details

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Namespace Prefix:	mtsi_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Standard and Extended Product Warranty Accrual, Increase (Decrease) For Direct Charges And Payments

+ References

No definition available.

+ Details

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Namespace Prefix:	mtsi_
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X

- Definition

Standard and Extended Product Warranty Accrual, Increase (Decrease) for Warranties Issued and Preexisting Warranties

+ References

No definition available.

+ Details

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Namespace Prefix:	mtsi_
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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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X

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(5)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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