Debt Instrument, Convertible, Number of Equity Instruments Per Contract

No definition available.

Name:	mtsc_DebtInstrumentConvertibleNumberofEquityInstrumentsPerContract
Namespace Prefix:	mtsc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	mtsc_TangibleEquityUnitsComponentAxis=mtsc_EquityComponentMember
Namespace Prefix:
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Balance Type:
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- Details

Name:	srt_RangeAxis=srt_MinimumMember
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- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
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- Details

Name:	srt_RangeAxis=srt_MaximumMember
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Earnings Per Share (Narrative) (Details)	3 Months Ended				9 Months Ended
Earnings Per Share (Narrative) (Details)	Jun. 29, 2019 shares	Jun. 30, 2018 shares	Sep. 30, 2017 shares	Jul. 02, 2016 trade_day shares	Jun. 29, 2019 trade_day shares	Jun. 30, 2018 shares
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	835,000	667,000			812,000	548,000
Equity Component
Class of Stock [Line Items]
Threshold consecutive trading days \| trade_day				20	20
Equity Component \| Minimum \| Common Class A
Class of Stock [Line Items]
Convertible, number of equity instruments per contract (in shares)	1.9841		1.9841	1.9841	1.9841
Equity Component \| Maximum \| Common Class A
Class of Stock [Line Items]
Convertible, number of equity instruments per contract (in shares)				2.3810	2.3810