Shareholders' Equity (Capped Call Transaction) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Jul. 02, 2016	Oct. 01, 2016
Equity [Abstract]
Capped calls, strike price	$ 50.40
Capped call, cap price	$ 58.80
Additional paid in capital, capped calls	$ 7,935	$ 7,935

Adjustments to Additional Paid in Capital, Purchase of Capped Call Transaction

No definition available.

Name:	mtsc_AdjustmentstoAdditionalPaidinCapitalPurchaseofCappedCallTransaction
Namespace Prefix:	mtsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration