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Industry Segments (Narrative) (Details)
 3 Months Ended
Mar. 29, 2015
segment
Revenue from External Customer [Line Items]  
Number of reportable segments 4us-gaap_NumberOfReportableSegments
Instrumentation  
Revenue from External Customer [Line Items]  
Number of product lines 3tdy_NumberOfProductLines
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_InstrumentationMember
Digital Imaging  
Revenue from External Customer [Line Items]  
Number of product lines 1tdy_NumberOfProductLines
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_DigitalImagingMember
Aerospace and Defense Electronics  
Revenue from External Customer [Line Items]  
Number of product lines 1tdy_NumberOfProductLines
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_AerospaceAndDefenseElectronicsMember
Engineered Systems  
Revenue from External Customer [Line Items]  
Number of product lines 3tdy_NumberOfProductLines
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_EngineeredSystemsMember