CONDENSED CONSOLIDATED COMBINED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	6 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 53	$ 72
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	138	70
Stock-based compensation	3	0
Deferred income tax benefit	(11)	0
Gain on sale of assets	(25)	0
Other non-cash charges, net	(14)	7
Changes in assets and liabilities, net of effects of acquisitions and dispositions:
Change in receivables	(4)	29
Change in prepaid expenses and other current assets	(18)	(5)
Change in accounts payable and accrued liabilities	92	98
Change in income taxes payable and income tax liability	6	0
Change in deferred revenue and advanced contract payments	13	8
Other operating activities, net	3	(5)
Net cash provided by operating activities	236	274
Cash flows from investing activities:
Payments for acquisitions, net of cash acquired	(312)	0
Extinguishment of Vencore HC and KGS HC debt and related costs	(994)	0
Proceeds from sale of assets	24	0
Purchases of property, equipment and software	(11)	(5)
Payments for outsourcing contract costs	(6)	(6)
Net cash used in investing activities	(1,299)	(11)
Cash flows from financing activities:
Principal payments on long-term debt	(50)	0
Proceeds from debt issuance	2,500	0
Payment of debt issuance costs	(43)	0
Proceeds from revolving credit facility	50	0
Payments on revolving credit facility	(50)	0
Payments on lease liability	(82)	(76)
Repurchases of common stock	(21)	0
Dividend to DXC	(984)	0
Dividends paid to Perspecta stockholders	(8)	0
Net transfers to Parent	(88)	(187)
Net cash provided by (used in) financing activities	1,224	(263)
Net increase in cash and cash equivalents, including restricted	161	0
Cash and cash equivalents, including restricted, at beginning of year	0	0
Cash and cash equivalents, including restricted, at end of period	161	0
Less restricted cash and cash equivalents included in prepaid expenses and other current assets	35	0
Cash and cash equivalents at end of period	$ 126	$ 0

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Period Type:	duration

- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

+ Details

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

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

+ Details

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

- Definition

Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(1)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(2))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration