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Basis Of Presentation (Details) (Information Management, Tax-free Distribution)
 0 Months Ended
Oct. 09, 2014
company
Information Management | Tax-free Distribution
  
Restructuring Cost and Reserve [Line Items]  
Planned number of independent companies 2symc_PlannedNumberofIndependentCompanies
/ us-gaap_RestructuringCostAndReserveAxis
= symc_TaxfreeDistributionMember
/ us-gaap_StatementBusinessSegmentsAxis
= symc_InformationManagementMember