Commitments and Contingencies - Contingencies (Details) $ in Millions			12 Months Ended
	Dec. 17, 2015 USD ($)	Jun. 09, 2015 Plaintiff	Apr. 01, 2016 USD ($)	[1]	Apr. 03, 2015 USD ($)	[2]	Mar. 28, 2014 USD ($)	[2]	May 12, 2016	Oct. 07, 2015 USD ($)
Loss Contingencies [Line Items]
SEC settlement related charges			$ 0.0		$ (197.0)		$ 0.0
Civil Complaint Against Eric Pulier | Pending litigation
Loss Contingencies [Line Items]
Gain contingency, amount sought										$ 98.0
Civil Complaint Against Eric Pulier | Settled litigation
Loss Contingencies [Line Items]
SEC settlement related charges	$ 16.5
Strauch and Colby v. Computer Sciences Corporation | Pending litigation
Loss Contingencies [Line Items]
Number of system administrators for class action, more than | Plaintiff		4,000
Subsequent event | CSC Agility Platform, Inc. | Civil Complaint Against Eric Pulier | Settled litigation
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Legal Fees, Percent									80.00%

[1] Due to the adoption of ASU 2016-09 certain balances related to excess tax benefits from stock compensation were adjusted prospectively as described in Note 1.

[2] Certain prior year balances were adjusted for certain errors in previously issued financial statements related to income taxes as described in Note 1 and to give effect to discontinued operations as described in Note 4.