Commitments and Contingencies - Contingencies (Details) $ in Thousands		1 Months Ended								6 Months Ended	12 Months Ended
	Aug. 06, 2019 USD ($)	Oct. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 16, 2019 lawsuit	Jun. 30, 2019 plaintiff	Mar. 31, 2019 lawsuit officer	Oct. 31, 2018 plaintiff	Oct. 31, 2017 USD ($)	Oct. 31, 2015 USD ($)	Sep. 30, 2019 individual	Apr. 03, 2015 administrator	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 ourt to participate in FLSA collective | administrator											1,000
Number of individuals involved in collective action | individual										800
Amount awarded to plaintiffs	$ 18,750
Loss contingency, damages sought			$ 14,100
Forsyth et al. v. HP Inc. and Hewlett Packard Enterprise
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff					145		16
In re DXC Technology Company Securities Litigation
Loss Contingencies [Line Items]
Lawsuits filed | lawsuit				3		3
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]
Amount awarded to other party								$ 84,200
Pending litigation | Kemper Corporate Services, Inc. v. Computer Sciences Corporation
Loss Contingencies [Line Items]
Loss contingency, damages sought									$ 100,000
Officer | In re DXC Technology Company Securities Litigation
Loss Contingencies [Line Items]
Number of defendants | officer						2
Subsequent event | Perspecta-related Disputes, Separation and Distribution Agreement
Loss Contingencies [Line Items]
Loss contingency, damages sought		$ 120,000
Subsequent event | Perspecta-related Disputes, IT Services Agreement
Loss Contingencies [Line Items]
Loss contingency, damages sought		$ 39,000