Commitments and Contingencies - Contingencies (Details) $ in Thousands			1 Months Ended									6 Months Ended	9 Months Ended	10 Months Ended
	Feb. 21, 2020 USD ($)	Aug. 06, 2019 USD ($)	Aug. 31, 2020 USD ($)	Jul. 31, 2020 USD ($)	Dec. 31, 2019 plaintiff	Oct. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($) plaintiff	Mar. 31, 2019 lawsuit officer	Oct. 31, 2018 plaintiff	Oct. 31, 2015 USD ($)	Oct. 02, 2015 administrator	Dec. 31, 2020 USD ($) individual	Dec. 31, 2020 USD ($)	Feb. 02, 2017 joint_venture	Feb. 29, 2016
Loss Contingencies [Line Items]
Number of partially-owned joint ventures involved in possible sanctions law violations | joint_venture															2
Strauch Fair Labor Standards Act Collective Action
Loss Contingencies [Line Items]
Number of plaintiffs | administrator												4,000
Number of system administrators filed consents with court to participate in FLSA collective | administrator												1,000
Number of individuals involved in collective action | individual													800
Amount awarded to plaintiffs		$ 18,750		$ 8,100
Loss contingency, damages sought							$ 14,100
Kemper Corporate Services, Inc. v. Computer Sciences Corporation
Loss Contingencies [Line Items]
Payments for litigation settlement	$ 60,000
Amount recovered from insurance carriers														$ 12,500
In re DXC Technology Company Securities Litigation
Loss Contingencies [Line Items]
Lawsuits filed | lawsuit									3
Perspecta-related Disputes, Separation and Distribution Agreement
Loss Contingencies [Line Items]
Loss contingency, damages sought						$ 120,000
Perspecta-related Disputes, Separation and Distribution Agreement, Increase One
Loss Contingencies [Line Items]
Loss contingency, damages sought													$ 500,000
Perspecta-related Disputes, Separation and Distribution Agreement, Increase Two
Loss Contingencies [Line Items]
Loss contingency, damages sought													800,000
Perspecta-related Disputes, Separation and Distribution Agreement, Increase Three
Loss Contingencies [Line Items]
Loss contingency, damages sought													$ 990,000
Perspecta-related Disputes, IT Services Agreement
Loss Contingencies [Line Items]
Loss contingency, damages sought			$ 31,000					$ 39,000
Settled litigation | Computer Sciences Corporation v. Eric Pulier et al.
Loss Contingencies [Line Items]
Loss contingency, legal fees percentage																80.00%
Settled litigation | Kemper Corporate Services, Inc. v. Computer Sciences Corporation
Loss Contingencies [Line Items]
Loss contingency, damages sought											$ 84,200
Settled litigation | Forsyth et al. v. HP Inc. and Hewlett Packard Enterprise
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff					142
Pending litigation | Kemper Corporate Services, Inc. v. Computer Sciences Corporation
Loss Contingencies [Line Items]
Loss contingency, damages sought											$ 100,000
Pending litigation | Forsyth et al. v. HP Inc. and Hewlett Packard Enterprise
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff								145		16
Officer | In re DXC Technology Company Securities Litigation
Loss Contingencies [Line Items]
Number of defendants | officer									1
Employees of Former Business Units of HPE | Settled litigation | Forsyth et al. v. HP Inc. and Hewlett Packard Enterprise
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff					35					7