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Business Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 27, 2014
segment
Dec. 28, 2013
Segment Reporting Information [Line Items]    
Number of operating segments 2us-gaap_NumberOfOperatingSegments  
Revenue $ 142,584us-gaap_Revenues $ 138,410us-gaap_Revenues
Income from operations 15,811us-gaap_OperatingIncomeLoss 14,147us-gaap_OperatingIncomeLoss
Test [Member]    
Segment Reporting Information [Line Items]    
Revenue 118,085us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_TestMember		 113,523us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_TestMember
Income from operations 11,976us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_TestMember		 9,841us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_TestMember
Sensors [Member]    
Segment Reporting Information [Line Items]    
Revenue 24,499us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_SensorsMember		 24,887us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_SensorsMember
Income from operations $ 3,835us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_SensorsMember		 $ 4,306us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_SensorsMember