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Business Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Mar. 28, 2015
segment
Mar. 29, 2014
Segment Reporting Information [Line Items]        
Number of operating segments     2us-gaap_NumberOfOperatingSegments  
Revenue $ 143,955us-gaap_Revenues $ 137,343us-gaap_Revenues $ 286,539us-gaap_Revenues $ 275,753us-gaap_Revenues
Income from operations 17,755us-gaap_OperatingIncomeLoss 12,354us-gaap_OperatingIncomeLoss 33,566us-gaap_OperatingIncomeLoss 26,501us-gaap_OperatingIncomeLoss
Test [Member]        
Segment Reporting Information [Line Items]        
Revenue 118,737us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_TestMember		 110,885us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_TestMember		 236,822us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_TestMember		 224,408us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_TestMember
Income from operations 13,141us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_TestMember		 7,741us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_TestMember		 25,117us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_TestMember		 17,582us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_TestMember
Sensors [Member]        
Segment Reporting Information [Line Items]        
Revenue 25,218us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_SensorsMember		 26,458us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_SensorsMember		 49,717us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_SensorsMember		 51,345us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_SensorsMember
Income from operations $ 4,614us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_SensorsMember		 $ 4,613us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_SensorsMember		 $ 8,449us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_SensorsMember		 $ 8,919us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mtsc_SensorsMember