Stock Incentive Plans - Schedule of RSUs (Details) - RSUs - $ / shares	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Number of Shares
Equity instruments other than options nonvested - beginning balance (in shares)	2,809,775	3,985,616	3,710,985
Equity instruments other than options nonvested - granted (in shares)	3,166,405	1,136,002	1,828,667
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 merger (in shares)			609,416
Equity instruments other than options nonvested - issued due to separation modification (in shares)		649,649
Equity instruments other than options nonvested - released/issued (in shares)	(1,039,346)	(2,207,467)	(1,934,446)
Equity instruments other than options nonvested - canceled/forfeited (in shares)	(762,358)	(754,025)	(324,822)
Equity instruments other than options nonvested - ending balance (in shares)	4,174,476	2,809,775	3,985,616
Weighted Average Grant Date Fair Value
Weighted average fair value other than options - beginning balance (in dollars per share)	$ 67.27	$ 47.25	$ 34.86
Weighted average fair value other than options - granted (in dollars per share)	45.58	77.10	82.34
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 - issued due to separation modification (in dollars per share)		51.98
Weighted average fair value other than options - options converted to RSUs due to merger (in dollars per share)			32.58
Weighted average fair value other than options - released/issued (in dollars per share)	54.39	33.05	35.93
Weighted average fair value other than options - canceled/forfeited (in dollars per share)	59.46	62.01	59.34
Weighted average fair value other than options - ending balance (in dollars per share)	$ 55.45	$ 67.27	$ 47.25
Nonemployee director incentives
Number of Shares
Equity instruments other than options nonvested - beginning balance (in shares)	75,750	66,386	85,766
Equity instruments other than options nonvested - granted (in shares)	62,200	19,200	22,900
Equity instruments other than options nonvested - issued due to separation modification (in shares)		10,488
Equity instruments other than options nonvested - released/issued (in shares)	(23,335)	(20,324)	(39,980)
Equity instruments other than options nonvested - canceled/forfeited (in shares)	0	0	(2,300)
Equity instruments other than options nonvested - ending balance (in shares)	114,615	75,750	66,386
Weighted Average Grant Date Fair Value
Weighted average fair value other than options - beginning balance (in dollars per share)	$ 46.31	$ 37.26	$ 34.19
Weighted average fair value other than options - granted (in dollars per share)	35.90	87.88	84.40
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 - released/issued (in dollars per share)	60.90	51.59	45.25
Weighted average fair value other than options - canceled/forfeited (in dollars per share)	0	0	85.35
Weighted average fair value other than options - ending balance (in dollars per share)	$ 37.69	$ 46.31	$ 37.26