Stock Incentive Plans - Schedule of RSUs (Details) - RSUs	9 Months Ended
	Dec. 31, 2017 $ / shares shares
DXC Employee Equity Plan
Number of Shares
Beginning balance (in shares) | shares	3,710,985
Granted (in shares) | shares	1,566,361
HPE RSUs converted to DSC RSUs due to Merger (in shares) | shares	95,683
Options converted to RSU due to Merger (in shares) | shares	609,416
Settled (in shares) | shares	(1,926,043)
Canceled/Forfeited (in shares) | shares	(172,881)
Ending balance (in shares) | shares	3,883,521
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value - Beginning balance (in dollars per share) | $ / shares	$ 34.86
Weighted Average Grant Date Fair Value - Granted (in dollars per share) | $ / shares	79.11
Weighted Average Grant Date Fair Value - HPE RSUs converted to DSC RSUs due to Merger (in dollars per share) | $ / shares	69.33
Weighted Average Grant Date Fair Value - Options converted to RSU due to merger (in dollars per share) | $ / shares	32.58
Weighted Average Grant Date Fair Value - Settled (in dollars per share) | $ / shares	35.89
Weighted Average Grant Date Fair Value - Canceled/Forfeited (in dollars per share) | $ / shares	54.65
Weighted Average Grant Date Fair Value - Ending balance (in dollars per share) | $ / shares	$ 51.80
DXC Director Equity Plan
Number of Shares
Beginning balance (in shares) | shares	85,766
Granted (in shares) | shares	22,900
HPE RSUs converted to DSC RSUs due to Merger (in shares) | shares	0
Options converted to RSU due to Merger (in shares) | shares	0
Settled (in shares) | shares	(39,980)
Canceled/Forfeited (in shares) | shares	0
Ending balance (in shares) | shares	68,686
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value - Beginning balance (in dollars per share) | $ / shares	$ 34.19
Weighted Average Grant Date Fair Value - Granted (in dollars per share) | $ / shares	84.40
Weighted Average Grant Date Fair Value - HPE RSUs converted to DSC RSUs due to Merger (in dollars per share) | $ / shares	0.00
Weighted Average Grant Date Fair Value - Options converted to RSU due to merger (in dollars per share) | $ / shares	0.00
Weighted Average Grant Date Fair Value - Settled (in dollars per share) | $ / shares	45.25
Weighted Average Grant Date Fair Value - Canceled/Forfeited (in dollars per share) | $ / shares	0.00
Weighted Average Grant Date Fair Value - Ending balance (in dollars per share) | $ / shares	$ 44.50