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Summary of Significant Accounting Policies - Change in Estimates (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Mar. 29, 2013
Summary of Significant Accounting Policies [Abstract]      
Gross favorable $ 112csc_GrossChangeInPretaxEarningsDueToChangeInEstimateFavorable $ 125csc_GrossChangeInPretaxEarningsDueToChangeInEstimateFavorable $ 142csc_GrossChangeInPretaxEarningsDueToChangeInEstimateFavorable
Gross unfavorable (40)csc_GrossChangeInPretaxEarningsDueToChangeInEstimateUnfavorable (50)csc_GrossChangeInPretaxEarningsDueToChangeInEstimateUnfavorable (122)csc_GrossChangeInPretaxEarningsDueToChangeInEstimateUnfavorable
Total net adjustments, before taxes and noncontrolling interests (1) $ 72csc_NetIncreaseDecreaseInPretaxEarningsDueToChangeInEstimate [1] $ 75csc_NetIncreaseDecreaseInPretaxEarningsDueToChangeInEstimate [1] $ 20csc_NetIncreaseDecreaseInPretaxEarningsDueToChangeInEstimate [1]
Impact on diluted EPS from continuing operations $ 0.29csc_ImpactOnDilutedEarningsPerShareFormContinuingOperations $ 0.31csc_ImpactOnDilutedEarningsPerShareFormContinuingOperations $ (0.10)csc_ImpactOnDilutedEarningsPerShareFormContinuingOperations
[1] Quarterly changes in estimated profitability on the same fixed price contract are disclosed gross as either favorable or unfavorable.