CONDENSED CONSOLIDATED COMBINED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Millions		3 Months Ended		6 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue		$ 1,068	$ 706	$ 1,861	$ 1,382
Costs of services (excludes depreciation and amortization and restructuring costs)		813	557	1,410	1,082
Selling, general, and administrative (excludes depreciation and amortization and restructuring costs)		89	35	150	81
Depreciation and amortization		74	33	138	70
Restructuring costs		2	4	2	7
Separation and integration-related costs		21	6	65	17
Interest expense		37	5	47	7
Other income, net		(4)	0	(28)	0
Total costs and expenses		1,032	640	1,784	1,264
Income before taxes		36	66	77	118
Income tax expense		12	26	24	46
Net income		$ 24	$ 40	$ 53	$ 72
Earnings per common share
Basic (in dollars per share)	[1]	$ 0.15	$ 0.28	$ 0.32	$ 0.51
Diluted (in dollars per share)	[1]	$ 0.14	$ 0.28	$ 0.32	$ 0.51
Number of shares from distribution in a spinoff		165,490	142,430	165,540	142,430

[1] Earnings per share information for the three and six months ended September 30, 2017 is computed using the 142.43 million shares of Perspecta common stock resulting from the Distribution, as Perspecta did not operate as a stand-alone entity during the period and therefore, no Perspecta common stock, stock options or other equity awards were outstanding and no dividends were declared or paid by Perspecta.