Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Sep. 28, 2019
Assets
Total assets	$ 454	$ 907
Liabilities
Currency contracts	271	251
Contingent consideration	19,180
Total liabilities	19,451	251
Level 1
Assets
Total assets	0	0
Liabilities
Currency contracts	0	0
Contingent consideration	0
Total liabilities	0	0
Level 2
Assets
Total assets	454	907
Liabilities
Currency contracts	271	251
Contingent consideration	0
Total liabilities	271	251
Level 3
Assets
Total assets	0	0
Liabilities
Currency contracts	0	0
Contingent consideration	19,180
Total liabilities	19,180	0
Currency contract
Assets
Currency contracts	170	907
Currency contract \| Level 1
Assets
Currency contracts	0	0
Currency contract \| Level 2
Assets
Currency contracts	170	907
Currency contract \| Level 3
Assets
Currency contracts	0	$ 0
Cross currency swap
Assets
Currency contracts	284
Cross currency swap \| Level 1
Assets
Currency contracts	0
Cross currency swap \| Level 2
Assets
Currency contracts	284
Cross currency swap \| Level 3
Assets
Currency contracts	$ 0

Fair value of contingent consideration in a business combination that is classified in liabilities.

No definition available.

Name:	mtsc_ContingentConsiderationClassifiedasLiabilityFairValueDisclosure
Namespace Prefix:	mtsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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- References

No definition available.

+ Details

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- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Fair value of financial and nonfinancial obligations.

+ References

+ Details

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

- References

No definition available.

+ Details

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

- Details

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- Details

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- Details

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