Basis of Presentation	9 Months Ended
Dec. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Computer Sciences Corporation (CSC or the Company) has prepared the interim unaudited Condensed Consolidated Financial Statements included herein pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (SEC) for quarterly reports and, therefore, such financial statements omit or condense certain note disclosures and other information required by generally accepted accounting principles in the United States (GAAP) for complete financial statements. These financial statements should therefore be read in conjunction with the audited Consolidated Financial Statements and accompanying Notes included in the Company's Annual Report on Form 10-K for the fiscal year ended April 1, 2016 (fiscal 2016). The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts and disclosures reported in the financial statements and accompanying notes. As a result, actual results may be different from these estimates. In the opinion of the Company's management, the accompanying unaudited Condensed Consolidated Financial Statements of CSC contain all adjustments necessary, including those of a normal recurring nature, to present fairly the Company's financial position as of December 30, 2016 and April 1, 2016 and its results of operations and cash flows for the three and nine months ended December 30, 2016 and January 1, 2016. The results of operations for such interim periods are not necessarily indicative of the results for the full year ending March 31, 2017. Certain prior year amounts have been reclassified to conform to the current year presentation. Intangible assets were combined into a single line on the face of the balance sheet, the details of which are disclosed in Note 9 - Goodwill and Other Intangible Assets. During fiscal 2016, the Company adopted Accounting Standards Update (ASU) 2016-09 which, among other elements, requires the excess tax benefits and deficiencies related to employee share-based payment awards and related dividends to be recorded in the statement of operations during the reporting period in which they occur. ASU 2016-09 also requires that all tax-related cash flows resulting from share-based payments, including the excess tax benefits related to the settlement of stock-based awards, be classified as cash flows from operating activities, and that cash paid by directly withholding shares for tax withholding purposes be classified as a financing activity in the unaudited Condensed Consolidated Statements of Cash Flows. CSC elected to early adopt ASU 2016-09 in the fourth quarter of fiscal 2016 which requires CSC to reflect any adjustments as of April 4, 2015, the beginning of the annual period that includes the adoption. Amendments requiring recognition of excess tax benefits and tax deficiencies within the unaudited Condensed Consolidated Statements of Operations were adopted prospectively and resulted in the recognition of $4 million, or $0.03 per share, and $20 million, or $0.14 per share, of excess tax benefits within income tax expense for the three and nine months ended January 1, 2016, respectively. ASU 2016-09 amendments related to presentation within the unaudited Condensed Consolidated Statements of Cash Flows were applied retrospectively, and resulted in the reclassification of $19 million of excess tax benefits related to the settlement of stock-based awards from financing to operating activities, and $28 million of taxes paid related to net share settlements of stock-based compensation awards from operating activities to financing activities for the nine months ended January 1, 2016. The Company reports its results based on a fiscal year convention that comprises four thirteen-week quarters. Every fifth year includes an additional week in the first quarter to prevent the fiscal year from moving from an approximate end of March date. Separation of NPS During fiscal 2016, the Company completed the separation of its U.S. public sector business (NPS) (the Separation) and combination of NPS with SRA International, Inc. to form a new independent publicly traded company. CSRA Inc. (CSRA). As a result of the Separation, the unaudited Condensed Consolidated Statements of Operations and related financial information reflect NPS's operations as discontinued operations for the three and nine months ended January 1, 2016. However, the cash flows and comprehensive income of NPS have not been segregated and are included in the unaudited Condensed Consolidated Statements of Cash Flows and Statements of Comprehensive Income for the three and nine months ended January 1, 2016. Furthermore, during fiscal 2016, CSC reduced the number of its reportable segments from three to two: Global Infrastructure Services (GIS) and Global Business Services (GBS). Refer to Note 4 - Divestitures and Note 16 - Segment Information for further information.

Basis of Presentation

Computer Sciences Corporation (CSC or the Company) has prepared the interim unaudited Condensed Consolidated Financial Statements included herein pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (SEC) for quarterly reports and, therefore, such financial statements omit or condense certain note disclosures and other information required by generally accepted accounting principles in the United States (GAAP) for complete financial statements. These financial statements should therefore be read in conjunction with the audited Consolidated Financial Statements and accompanying Notes included in the Company's Annual Report on Form 10-K for the fiscal year ended April 1, 2016 (fiscal 2016).

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts and disclosures reported in the financial statements and accompanying notes. As a result, actual results may be different from these estimates. In the opinion of the Company's management, the accompanying unaudited Condensed Consolidated Financial Statements of CSC contain all adjustments necessary, including those of a normal recurring nature, to present fairly the Company's financial position as of December 30, 2016 and April 1, 2016 and its results of operations and cash flows for the three and nine months ended December 30, 2016 and January 1, 2016. The results of operations for such interim periods are not necessarily indicative of the results for the full year ending March 31, 2017. Certain prior year amounts have been reclassified to conform to the current year presentation. Intangible assets were combined into a single line on the face of the balance sheet, the details of which are disclosed in Note 9 - Goodwill and Other Intangible Assets.

During fiscal 2016, the Company adopted Accounting Standards Update (ASU) 2016-09 which, among other elements, requires the excess tax benefits and deficiencies related to employee share-based payment awards and related dividends to be recorded in the statement of operations during the reporting period in which they occur. ASU 2016-09 also requires that all tax-related cash flows resulting from share-based payments, including the excess tax benefits related to the settlement of stock-based awards, be classified as cash flows from operating activities, and that cash paid by directly withholding shares for tax withholding purposes be classified as a financing activity in the unaudited Condensed Consolidated Statements of Cash Flows. CSC elected to early adopt ASU 2016-09 in the fourth quarter of fiscal 2016 which requires CSC to reflect any adjustments as of April 4, 2015, the beginning of the annual period that includes the adoption. Amendments requiring recognition of excess tax benefits and tax deficiencies within the unaudited Condensed Consolidated Statements of Operations were adopted prospectively and resulted in the recognition of $4 million, or $0.03 per share, and $20 million, or $0.14 per share, of excess tax benefits within income tax expense for the three and nine months ended January 1, 2016, respectively. ASU 2016-09 amendments related to presentation within the unaudited Condensed Consolidated Statements of Cash Flows were applied retrospectively, and resulted in the reclassification of $19 million of excess tax benefits related to the settlement of stock-based awards from financing to operating activities, and $28 million of taxes paid related to net share settlements of stock-based compensation awards from operating activities to financing activities for the nine months ended January 1, 2016.

The Company reports its results based on a fiscal year convention that comprises four thirteen-week quarters. Every fifth year includes an additional week in the first quarter to prevent the fiscal year from moving from an approximate end of March date.

Separation of NPS

During fiscal 2016, the Company completed the separation of its U.S. public sector business (NPS) (the Separation) and combination of NPS with SRA International, Inc. to form a new independent publicly traded company. CSRA Inc. (CSRA). As a result of the Separation, the unaudited Condensed Consolidated Statements of Operations and related financial information reflect NPS's operations as discontinued operations for the three and nine months ended January 1, 2016. However, the cash flows and comprehensive income of NPS have not been segregated and are included in the unaudited Condensed Consolidated Statements of Cash Flows and Statements of Comprehensive Income for the three and nine months ended January 1, 2016. Furthermore, during fiscal 2016, CSC reduced the number of its reportable segments from three to two: Global Infrastructure Services (GIS) and Global Business Services (GBS). Refer to Note 4 - Divestitures and Note 16 - Segment Information for further information.