Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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-Topic 235
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.4-08(f))
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-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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Balance Type:	credit
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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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-Topic 946
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-03(i)(2))
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Name:	us-gaap_DebtInstrumentAxis=tdy_A133UnsecuredTermLoanDueMay2026Member
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Long-Term Debt - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
Long-Term Debt - Narrative (Details) - USD ($)	Oct. 01, 2023	Oct. 02, 2022	Oct. 01, 2023	Oct. 02, 2022	Jan. 01, 2023
Line of Credit Facility [Line Items]
Gain (loss) on debt extinguishment	$ 0	$ 0	$ 1,600,000	$ 10,600,000
Long-term debt fair value	2,823,400,000		2,823,400,000		$ 3,492,700,000
Borrowings	3,266,400,000		3,266,400,000		3,947,100,000
Term Loans \| Term Loan Due May 2026
Line of Credit Facility [Line Items]
Borrowings	0		0		245,000,000.0
Senior Notes
Line of Credit Facility [Line Items]
Gain (loss) on debt extinguishment			1,600,000
Senior Notes \| 0.65% Fixed Rate Senior Notes due April 2023
Line of Credit Facility [Line Items]
Repayments debt			300,000,000
Borrowings	0		0		300,000,000.0
Senior Notes \| 2.75% Fixed Rate Senior Notes due April 2031
Line of Credit Facility [Line Items]
Debt repurchased and retired	10,000,000		10,000,000
Borrowings	1,030,000,000		1,030,000,000		1,040,000,000
Revolving Credit Facility \| Credit Facility
Line of Credit Facility [Line Items]
Repayments debt			125,000,000
Available balance	1,130,900,000		1,130,900,000
Maximum borrowing capacity	1,150,000,000		1,150,000,000
Borrowings	0		0		$ 125,000,000.0
Revolving Credit Facility \| Term Loans \| Term Loan Due May 2026
Line of Credit Facility [Line Items]
Repayments debt			245,000,000
Letter of Credit \| Credit Facility
Line of Credit Facility [Line Items]
Outstanding letters of credit	$ 19,100,000		$ 19,100,000