Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Oct. 02, 2015	Oct. 03, 2014	Oct. 02, 2015	Oct. 03, 2014
Net income attributable to CSC common shareholders [Abstract]
From continuing operations	$ 167	$ 172	$ 327	$ 326
From discontinued operations	0	(21)	0	(29)
Net income attributable to CSC common stockholders	$ 167	$ 151	$ 327	$ 297
Common share information [Abstract]
Weighted average common shares outstanding for basic EPS (in shares)	138,295,000	143,279,000	138,106,000	144,346,000
Dilutive effect of stock options and equity awards (in shares)	2,237,000	2,317,000	2,593,000	2,809,000
Shares for diluted earnings per share (in shares)	140,532,000	145,596,000	140,699,000	147,155,000
Basic EPS:
Basic EPS - Continuing operations (in dollars per share)	$ 1.21	$ 1.20	$ 2.37	$ 2.26
Basic EPS - Discontinued Operations (in dollars per share)	0.00	(0.15)	0.00	(0.20)
Basic EPS (in dollars per share)	1.21	1.05	2.37	2.06
Diluted EPS:
Diluted EPS - Continuing operations (in dollars per share)	1.19	1.18	2.32	2.22
Diluted EPS - Discontinued operations (in dollars per share)	0.00	(0.14)	0.00	(0.20)
Diluted EPS (in dollars per share)	$ 1.19	$ 1.04	$ 2.32	$ 2.02
Antidilution Due To Exercise Price Exceeding Average Market Price | Employee Stock Option
Antidilutive securities excluded from computation	2,094,671	1,306,873	1,826,679	1,006,720
Antidilution Due To Exercise Price Exceeding Average Market Price | Restricted Stock Units (RSUs)
Antidilutive securities excluded from computation	9,637	1,146,523	3,837	433,709