Debt (Details) $ in Millions	Jun. 30, 2025 USD ($) Rate
Due 2025 [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Face Amount \| $	$ 500.0
Debt Instrument, Interest Rate, Stated Percentage \| Rate	5.25%
Due 2032 [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Face Amount \| $	$ 500.0
Debt Instrument, Interest Rate, Stated Percentage \| Rate	5.25%
Debt Instrument, Issued Percentage \| Rate	99.581%
Debt Issuance Costs, Gross \| $	$ 6.7

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

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-Topic 835
-SubTopic 30
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-Section 55
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+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
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+ Details

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

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_ExtinguishmentOfDebtLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Issued Percentage

+ References

No definition available.

+ Details

Name:	vrsn_DebtInstrumentIssuedPercentage
Namespace Prefix:	vrsn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=vrsn_Due2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=vrsn_Due2032Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: