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Other Balance Sheet Items Other Balance Sheet Items (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Other Balance Sheet Items (narrative) [Abstract]
Amortization of Other Deferred Charges	$ 8.3	$ 24.5

X

- Definition

Amount of amortization of other deferred costs recognized in the income statement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Other Balance Sheet Items (narrative) [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	vrsn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration