Earnings (Loss) Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 02, 2015	Dec. 27, 2013	Jan. 02, 2015	Dec. 27, 2013
Net income attributable to CSC common shareholders [Abstract]
From continuing operations	$ (314)	$ 276	$ 12	$ 586
From discontinued operations	0	(5)	(29)	91
Net (loss) income attributable to CSC common stockholders	$ (314)	$ 271	$ (17)	$ 677
Common share information [Abstract]
Weighted average common shares outstanding for basic EPS (in shares)	140,637,000	146,735,000	143,141,000	148,212,000
Dilutive effect of stock options and equity awards (in shares)	0	2,627,000	3,182,000	2,912,000
Shares for diluted earnings (loss) per share (in shares)	140,637,000	149,362,000	146,323,000	151,124,000
Basic EPS:
Basic EPS - Continuing operations (in dollars per share)	$ (2.23)	$ 1.88	$ 0.08	$ 3.96
Basic EPS - Discontinued Operations (in dollars per share)	$ 0.00	$ (0.03)	$ (0.20)	$ 0.61
Basic EPS (in dollars per share)	$ (2.23)	$ 1.85	$ (0.12)	$ 4.57
Diluted EPS:
Diluted EPS - Continuing operations (in dollars per share)	$ (2.23)	$ 1.84	$ 0.08	$ 3.88
Diluted EPS - Discontinued operations (in dollars per share)	$ 0.00	$ (0.03)	$ (0.20)	$ 0.60
Diluted EPS (in dollars per share)	$ (2.23)	$ 1.81	$ (0.12)	$ 4.48
Employee Stock Option [Member]
Diluted EPS:
Antidilutive securities excluded from computation	5,934,192
Restricted Stock Units (RSUs) [Member]
Diluted EPS:
Antidilutive securities excluded from computation	2,019,663
Antidilution Due To Exercise Price Exceeding Average Market Price [Member] | Employee Stock Option [Member]
Diluted EPS:
Antidilutive securities excluded from computation	1,218,655	4,765,896	1,074,109	4,843,346
Antidilution Due To Exercise Price Exceeding Average Market Price [Member] | Restricted Stock Units (RSUs) [Member]
Diluted EPS:
Antidilutive securities excluded from computation	1,666,952	535,373	101,058	139,548