Basis Of Presentation Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Basis of Presentation (Narrative) [Abstract]
Debt issuance costs reclassified	$ 25.6	$ 20.4

Debt issuance costs reclassified upon adoption of new accounting standard

No definition available.

Name:	vrsn_Debtissuancecostsreclassified
Namespace Prefix:	vrsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant