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Cover Page - USD ($)
 12 Months Ended
Mar. 31, 2025
May 05, 2025
Sep. 30, 2024
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2025    
Current Fiscal Year End Date --03-31    
Document Transition Report false    
Entity File Number 1-4850    
Entity Registrant Name DXC TECHNOLOGY CO    
Entity Incorporation, State or Country Code NV    
Entity Tax Identification Number 61-1800317    
Entity Address, Address Line One 20408 Bashan Drive, Suite 231    
Entity Address, City or Town Ashburn    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 20147    
City Area Code 703    
Local Phone Number 972-9700    
Entity Well-Known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 3,736,469,619
Entity Common Stock, Shares Outstanding   181,266,304  
Documents Incorporated by Reference
Portions of the registrant's definitive Proxy Statement relating to its 2025 Annual Meeting of Stockholders (the "2025 Proxy Statement"), which will be filed with the Securities and Exchange Commission pursuant to Regulation 14A within 120 days after the registrant's fiscal year end of March 31, 2025, are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.
    
Entity Central Index Key 0001688568    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common Stock, $0.01 par value per share      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol DXC    
Security Exchange Name NYSE    
1.750% Senior Notes Due 2026      
Document Information [Line Items]      
Title of 12(b) Security 1.750% Senior Notes Due 2026    
Trading Symbol DXC 26    
Security Exchange Name NYSE