Summary of Significant Accounting Policies - Revenue Recognition (Details)	12 Months Ended
Apr. 01, 2016
Revenue Recognition [Abstract]
Maximum percentage of the Company's revenues recognized under the percentage-of-completion method (in hundredths)	7.10%

Maximum percentage of the company's revenue recognition for long-term construction-type contracts accounted for using the percentage-of-completion method.

No definition available.

Name:	csc_MaximumPercentageOfRevenuesRecognizedUnderPercentageOfCompletionMethod
Namespace Prefix:	csc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration