Financial Instruments	12 Months Ended
Dec. 29, 2019
Fair Value Disclosures [Abstract]
Financial Instruments	Financial InstrumentsThe Company had no cash equivalents at December 29, 2019 or December 30, 2018. The fair value of the Company’s forward currency contracts as of December 29, 2019 and December 30, 2018, are disclosed in Note 2, under “Derivative Instruments and Hedging Activities,” of the Notes to Consolidated Financial Statements and are based on Level 2 inputs. Teledyne estimates the fair value of its long-term debt based on debt of similar type, rating and maturity and at comparable interest rates. The fair value of the Company’s senior unsecured notes as described in Note 9, “Long-Term Debt,” of the Notes to Consolidated Financial Statements approximated the carrying value based upon Level 2 inputs and is valued based on observable market data at December 29, 2019 and December 30, 2018. The fair value of the Company’s credit facility, term loans and other debt, also described in Note 9, at December 29, 2019 and December 30, 2018, approximated the carrying value due to the variable market rate used to calculate interest payments. The Company does not have any other significant financial assets or liabilities that are measured at fair value. The carrying value of other on-balance-sheet financial instruments approximates fair value, and the cost, if any, to terminate off-balance sheet financial instruments (primarily letters of credit) is not significant.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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