Stock Incentive Plans - Schedule of RSUs (Details) - $ / shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Number of Shares
Equity instruments other than options nonvested - issued due to Separation modification (in shares)	649,649
Equity instruments other than options nonvested - HPE RSUs converted to DXC RSUs due to HPES Merger (in shares)		95,816
Equity instruments other than options nonvested - Options converted to RSUs due to HPES Merger (in shares)		609,416
Weighted Average Grant Date Fair Value
Weighted average fair value other than options - issued due to separation modification (in dollars per share)	$ 51.98
Weighted average fair value other than options - HPE RSUs converted to DXC RSUs due to HPES Merger (in dollars per share)		$ 69.34
Weighted average fair value other than options - options converted to RSUs due to HPES Merger (in dollars per share)		$ 32.58
Nonemployee director incentives
Number of Shares
Equity instruments other than options nonvested - beginning balance (in shares)	66,386	85,766	89,046
Equity instruments other than options nonvested - granted (in shares)	19,200	22,900	33,600
Equity instruments other than options nonvested - HPE RSUs converted to DXC RSUs due to HPES Merger (in shares)	10,488
Equity instruments other than options nonvested - settled (in shares)	(20,324)	(39,980)	(32,080)
Equity instruments other than options nonvested - canceled/forfeited (in shares)	0	(2,300)	(4,800)
Equity instruments other than options nonvested - ending balance (in shares)	75,750	66,386	85,766
Weighted Average Grant Date Fair Value
Weighted average fair value other than options - beginning balance (in dollars per share)	$ 37.26	$ 34.19	$ 27.00
Weighted average fair value other than options - granted (in dollars per share)	87.88	84.40	47.35
Weighted average fair value other than options - issued due to separation modification (in dollars per share)	37.69
Weighted average fair value other than options - settled (in dollars per share)	51.59	45.25	28.58
Weighted average fair value other than options - canceled/forfeited (in dollars per share)	0.00	85.35	30.31
Weighted average fair value other than options - ending balance (in dollars per share)	$ 46.31	$ 37.26	$ 34.19
Restricted Stock Units (RSUs)
Number of Shares
Equity instruments other than options nonvested - beginning balance (in shares)	3,985,616	3,710,985	3,597,999
Equity instruments other than options nonvested - granted (in shares)	1,136,002	1,828,667	1,150,185
Equity instruments other than options nonvested - settled (in shares)	(2,207,467)	(1,934,446)	(602,467)
Equity instruments other than options nonvested - canceled/forfeited (in shares)	(754,025)	(324,822)	(434,732)
Equity instruments other than options nonvested - ending balance (in shares)	2,809,775	3,985,616	3,710,985
Weighted Average Grant Date Fair Value
Weighted average fair value other than options - beginning balance (in dollars per share)	$ 47.25	$ 34.86	$ 29.25
Weighted average fair value other than options - granted (in dollars per share)	77.10	82.34	47.70
Weighted average fair value other than options - settled (in dollars per share)	33.05	35.93	27.29
Weighted average fair value other than options - canceled/forfeited (in dollars per share)	62.01	59.34	32.86
Weighted average fair value other than options - ending balance (in dollars per share)	$ 67.27	$ 47.25	$ 34.86