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Stock Incentive Plans - Schedule of share based compensation shares authorized under stock option plans by exercise price range table (Details) (USD $)
12 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options outstanding (in shares) 5,556,309us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions  
Number of exercisable options (in shares) 3,318,051us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions  
$23.06 - $44.65    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of option exercise price, minimum   $ 23.06us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange1Member
Range of option exercise price, maximum   $ 44.65us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange1Member
Number of options outstanding (in shares) 2,706,562us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange1Member
 
Weighted average exercise price (in dollars per share) $ 36.39us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange1Member
 
Weighted average remaining contractual life (in years) 6 years 7 months 21 days  
Number of exercisable options (in shares) 1,675,961us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange1Member
 
Weighted average exercise price of exercisable options (in dollars per share) $ 34.65us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange1Member
 
$44.89 - $60.90    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of option exercise price, minimum   $ 44.89us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange2Member
Range of option exercise price, maximum   $ 60.90us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange2Member
Number of options outstanding (in shares) 2,756,837us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange2Member
 
Weighted average exercise price (in dollars per share) $ 55.03us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange2Member
 
Weighted average remaining contractual life (in years) 5 years 1 month 24 days  
Number of exercisable options (in shares) 1,633,753us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange2Member
 
Weighted average exercise price of exercisable options (in dollars per share) $ 51.85us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange2Member
 
$61.93 - $63.06    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of option exercise price, minimum   $ 61.93us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange3Member
Range of option exercise price, maximum   $ 63.06us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange3Member
Number of options outstanding (in shares) 92,910us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange3Member
 
Weighted average exercise price (in dollars per share) $ 62.62us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange3Member
 
Weighted average remaining contractual life (in years) 8 years 6 months 29 days  
Number of exercisable options (in shares) 8,337us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange3Member
 
Weighted average exercise price of exercisable options (in dollars per share) $ 62.36us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= csc_StockOptionPriceRange3Member