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Settlement of SEC Investigation (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Mar. 29, 2013
Jan. 02, 2015
Loss Contingencies [Line Items]        
Litigation settlement amount $ (197)us-gaap_LitigationSettlementAmount $ 0us-gaap_LitigationSettlementAmount $ 0us-gaap_LitigationSettlementAmount  
NHS contract | Contracts Accounted for under Percentage of Completion, U.S. Claims        
Loss Contingencies [Line Items]        
Penalty paid       190us-gaap_LossContingencyDamagesPaidValue
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= csc_ContractsAccountedForUnderPercentageOfCompletionUSClaimsMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NhsContractMember
Litigation settlement amount $ (197)us-gaap_LitigationSettlementAmount
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= csc_ContractsAccountedForUnderPercentageOfCompletionUSClaimsMember
/ us-gaap_StatementBusinessSegmentsAxis
= csc_NhsContractMember