Debt Instrument, Number Of Payments

No definition available.

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Namespace Prefix:	tdc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Extension Period

+ References

No definition available.

+ Details

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Namespace Prefix:	tdc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Number Of Extension Periods

+ References

No definition available.

+ Details

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Namespace Prefix:	tdc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Additional Borrowings Capacity

+ References

No definition available.

+ Details

Name:	tdc_LineofCreditFacilityAdditionalBorrowingsCapacity
Namespace Prefix:	tdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
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.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Stated rate on an interest rate forward or futures contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeForwardInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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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+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=tdc_RevolvingCreditFacilityEndingInJune2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=tdc_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=tdc_SeniorUnsecuredtermloanIssuedJune2018Member
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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Debt - Additional Information (Detail)	1 Months Ended
Debt - Additional Information (Detail)	Jun. 30, 2018 USD ($) payment extension	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument
Number of extensions \| extension	2
Extension period	1 year
Borrowings outstanding		$ 0	$ 0
Revolving Credit Facility \| Revolving Credit Facility Ending In June 2023
Debt Instrument
Debt term	5 years
Credit facility maximum borrowing capacity	$ 400,000,000	$ 400,000,000	400,000,000
Additional borrowings capacity under Revolving Credit Agreement	200,000,000
Term Loan
Debt Instrument
Debt term		5 years
Unamortized debt issuance expense		$ 1,000,000
Term Loan \| Senior Unsecured term loan Issued June 2018
Debt Instrument
Debt instrument, face amount	$ 500,000,000
Revolving credit agreement period (in years)	5 years
Long-term debt		$ 413,000,000	$ 456,000,000
Fixed rate on term loan (percentage)		2.86%
All-in fixed rate (percentage)		4.23%	4.36%
First eight payments \| Term Loan \| Senior Unsecured term loan Issued June 2018
Debt Instrument
Interest rate (percentage)	1.25%
Number of payments \| payment	8
Next four payments \| Term Loan \| Senior Unsecured term loan Issued June 2018
Debt Instrument
Interest rate (percentage)	2.50%
Number of payments \| payment	4
Next three payments \| Term Loan \| Senior Unsecured term loan Issued June 2018
Debt Instrument
Interest rate (percentage)	5.00%
Number of payments \| payment	3