Segment and Geographic Information Geographic revenue and property and equipment, net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Mar. 28, 2014	Mar. 29, 2013	Mar. 30, 2012
Segment Reporting Information [Line Items]
Revenues	$ 12,998us-gaap_Revenues	$ 14,195us-gaap_Revenues	$ 14,673us-gaap_Revenues
Property and Equipment, Net	2,031us-gaap_NoncurrentAssets	2,184us-gaap_NoncurrentAssets	2,441us-gaap_NoncurrentAssets
Total Assets	11,389us-gaap_Assets	11,251us-gaap_Assets	11,189us-gaap_Assets
Capital Expenditures	595	568	829
Percentage of revenues derived from the US federal government (in hundredths)	30.00%	31.00%	32.00%
Percentage of accounts receivable due from the US federal government (in hundredths)	25.00%	28.00%
Maximum percentage of revenues from transactions with a single commercial customer (in hundredths)	10.00%	10.00%	10.00%
United States [Member]
Segment Reporting Information [Line Items]
Revenues	7,766	8,571	8,615
Property and Equipment, Net	1,177	1,273	1,406
Total Assets	6,728	6,454	6,198
Capital Expenditures	333	290	444
United Kingdom [Member]
Segment Reporting Information [Line Items]
Revenues	1,699	1,729	1,757
Property and Equipment, Net	335	320	367
Total Assets	1,614	1,389	1,329
Capital Expenditures	89	70	77
Other Europe [Member]
Segment Reporting Information [Line Items]
Revenues	2,150	2,193	2,432
Property and Equipment, Net	253	217	237
Total Assets	1,473	1,487	1,115
Capital Expenditures	85	80	90
Other International [Member]
Segment Reporting Information [Line Items]
Revenues	1,383	1,702	1,869
Property and Equipment, Net	266	374	431
Total Assets	1,574	1,921	2,547
Capital Expenditures	$ 88	$ 128	$ 218

The percentage of accounts receivable due from departments and agencies of the US federal government.

No definition available.

Name:	csc_SegmentReportingInformationPercentageOfAccountsReceivableDueFromUsFederalGovernmentAgenciesAndDepartments
Namespace Prefix:	csc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of revenues derived from departments and agencies of the US federal government.

+ References

No definition available.

+ Details

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

- Definition

The percentage that no single commercial customer exceeded of the company's revenues during the period.

+ References

No definition available.

+ Details

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

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

+ Details

Name:	us-gaap_Assets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

+ Details

Name:	us-gaap_NoncurrentAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=csc_OtherEuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=csc_OtherInternationalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: