Financing (Schedule of Interest Rate Swap) (Details)	Oct. 20, 2016 USD ($)
Debt Disclosure [Abstract]
October 3, 2019	$ 180,000,000
October 3, 2020	125,000,000
April 3, 2021	$ 0

Derivative Instruments, Payment Received on Interest Rate Swap, Period Three

No definition available.

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