Subsequent Event (Details) (Information Management, Tax-free Distribution, Subsequent Event)	0 Months Ended
Oct. 09, 2014 company
Information Management \| Tax-free Distribution \| Subsequent Event
Subsequent Event [Line Items]
Planned number of independent companies	2
Percentage of capital stock planned to be distributed	100.00%

Tax-free Distribution, Planned Percentage of Capital Stock to be Distributed

No definition available.

Name:	symc_TaxfreeDistributionPlannedPercentageofCapitalStocktobeDistributed
Namespace Prefix:	symc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration