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Business Segments Business Segments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 28, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
business_unit
Dec. 29, 2013
Sep. 29, 2013
Jun. 30, 2013
business_unit
Mar. 31, 2013
Dec. 28, 2014
segment
Dec. 29, 2013
Dec. 30, 2012
Segment Reporting Information [Line Items]                      
Number of reportable segments                 4us-gaap_NumberOfReportableSegments    
Number of interconnect business units reported in the instrumentation segment       1tdy_NumberofInterconnectBusinessUnitsReportedintheInstrumentationSegment     2tdy_NumberofInterconnectBusinessUnitsReportedintheInstrumentationSegment        
Restructuring charges                   $ 24.0us-gaap_RestructuringCharges  
Severance costs                   10.4us-gaap_SeveranceCosts1  
Facility closure and relocation costs                   13.6us-gaap_BusinessExitCosts1  
Environmental reserve         5.3tdy_RestructuringReserveEnvironmentalReserve 14.3tdy_RestructuringReserveEnvironmentalReserve 2.2tdy_RestructuringReserveEnvironmentalReserve 2.2tdy_RestructuringReserveEnvironmentalReserve   5.3tdy_RestructuringReserveEnvironmentalReserve  
Expected cost remaining 4.4us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1               4.4us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1    
Sales 622.3us-gaap_SalesRevenueNet [1] 601.1us-gaap_SalesRevenueNet [1] 597.1us-gaap_SalesRevenueNet [1] 573.5us-gaap_SalesRevenueNet [1] 596.6us-gaap_SalesRevenueNet [2] 571.6us-gaap_SalesRevenueNet [2] 601.0us-gaap_SalesRevenueNet [2] 569.4us-gaap_SalesRevenueNet [2] 2,394.0us-gaap_SalesRevenueNet 2,338.6us-gaap_SalesRevenueNet 2,127.3us-gaap_SalesRevenueNet
Sales to international customers                 1,069.3us-gaap_Revenues 1,031.8us-gaap_Revenues 831.7us-gaap_Revenues
Domestic Operations                      
Segment Reporting Information [Line Items]                      
Sales to international customers                 624.0us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= tdy_DomesticOperationsMember
566.0us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= tdy_DomesticOperationsMember
492.2us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= tdy_DomesticOperationsMember
United States Department of Defense                      
Segment Reporting Information [Line Items]                      
Sales                 472.8us-gaap_SalesRevenueNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= tdy_UnitedStatesDepartmentOfDefenseMember
487.9us-gaap_SalesRevenueNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= tdy_UnitedStatesDepartmentOfDefenseMember
542.6us-gaap_SalesRevenueNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= tdy_UnitedStatesDepartmentOfDefenseMember
Aerospace                      
Segment Reporting Information [Line Items]                      
Amount transferred                     55.3tdy_SalesRevenueNetAmountTransferred
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_AerospaceMember
Aerospace and Defense Electronics                      
Segment Reporting Information [Line Items]                      
Restructuring charges                 0.9us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_AerospaceAndDefenseElectronicsMember
15.7us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_AerospaceAndDefenseElectronicsMember
1.7us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_AerospaceAndDefenseElectronicsMember
Number of product lines 1tdy_NumberOfProductLines
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_AerospaceAndDefenseElectronicsMember
              1tdy_NumberOfProductLines
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_AerospaceAndDefenseElectronicsMember
   
Sales                 603.0us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_AerospaceAndDefenseElectronicsMember
625.1us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_AerospaceAndDefenseElectronicsMember
605.3us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_AerospaceAndDefenseElectronicsMember
Digital Imaging                      
Segment Reporting Information [Line Items]                      
Restructuring charges                 2.7us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_DigitalImagingMember
3.9us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_DigitalImagingMember
 
Number of product lines 1tdy_NumberOfProductLines
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_DigitalImagingMember
              1tdy_NumberOfProductLines
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_DigitalImagingMember
   
Sales                 403.6us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_DigitalImagingMember
414.8us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_DigitalImagingMember
415.9us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_DigitalImagingMember
Instrumentation                      
Segment Reporting Information [Line Items]                      
Restructuring charges                 1.0us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_InstrumentationMember
2.5us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_InstrumentationMember
 
Number of product lines 3tdy_NumberOfProductLines
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_InstrumentationMember
              3tdy_NumberOfProductLines
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_InstrumentationMember
   
Sales of business unit moved from environmental to instrumentation line                   9.4tdy_SalesofBusinessUnitMovedfromEnvironmentaltoInstrumentationLine
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_InstrumentationMember
 
Sales                 1,115.5us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_InstrumentationMember
1,022.8us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_InstrumentationMember
804.7us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_InstrumentationMember
Engineered Systems                      
Segment Reporting Information [Line Items]                      
Restructuring charges                   1.9us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_EngineeredSystemsMember
 
Number of product lines 3tdy_NumberOfProductLines
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_EngineeredSystemsMember
              3tdy_NumberOfProductLines
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_EngineeredSystemsMember
   
Sales                 $ 271.9us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_EngineeredSystemsMember
$ 275.9us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_EngineeredSystemsMember
$ 301.4us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= tdy_EngineeredSystemsMember
[1] Fiscal year 2014 was a P364D-week year, each quarter contained P91D weeks.
[2] Fiscal year 2013 was a P364D-week year, each quarter contained P91D weeks.