Derivative Instruments and Hedging Activities (Net Gains (Losses) Recognized in Income for Derivative Contracts) (Details) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2016	Jan. 02, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net (loss) gain recognized in other (expense) income, net	$ 421	$ (91)

The amount of net gains or losses on a cash flow hedge reclassified in the period to other (expense) income from accumulated other comprehensive income.

No definition available.

Name:	mtsc_CashFlowHedgeGainLossReclassifiedNetLossGainRecognizedInOtherExpenseIncomeNet
Namespace Prefix:	mtsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration