Stock Incentive Plans - Schedule of Share Based Compensation Shares Authorized (Details) - $ / shares	Sep. 30, 2017	Mar. 31, 2017	[1]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Reserved for issuance (in shares)	34,680,000
Available for future grants (in shares)	22,831,950
DXC Employee Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for issuance (in shares)	34,200,000
Available for future grants (in shares)	22,460,616
DXC Director Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for issuance (in shares)	230,000
Available for future grants (in shares)	121,334
DXC Share Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for issuance (in shares)	250,000
Available for future grants (in shares)	250,000

[1] Certain prior year amounts were adjusted to retroactively reflect the legal capital of DXC.