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DOCUMENT AND ENTITY INFORMATION - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2026
Jun. 12, 2026
Document Information [Line Items]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date May 31, 2026  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2026  
Entity Registrant Name Oracle Corporation  
Entity Central Index Key 0001341439  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Current Fiscal Year End Date --05-31  
Entity Filer Category Large Accelerated Filer  
Entity Well-known Seasoned Issuer Yes  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   2,880,471,000
Entity Public Float (in dollars) $ 346,760,150  
Entity File Number 001-35992  
Entity Tax Identification Number 54-2185193  
Entity Address, Address Line One 2300 Oracle Way  
Entity Address, City or Town Austin  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 78741  
City Area Code 737  
Local Phone Number 867-1000  
Entity Interactive Data Current Yes  
ICFR Auditor Attestation Flag true  
Document Financial Statement Error Correction [Flag] false  
Entity Incorporation, State or Country Code DE  
Document Annual Report true  
Document Transition Report false  
Auditor Firm ID 42  
Auditor Name Ernst & Young LLP  
Auditor Location San Jose, California  
Documents Incorporated by Reference

Portions of the registrant's definitive proxy statement relating to its 2026 annual meeting of stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Such proxy statement will be filed with the U.S. Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended May 31, 2026.

  
Auditor Opinion [Text Block]

We have audited Oracle Corporation’s internal control over financial reporting as of May 31, 2026, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, Oracle Corporation (the Company) maintained, in all material respects, effective internal control over financial reporting as of May 31, 2026, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of May 31, 2026 and 2025, the related consolidated statements of operations, comprehensive income, stockholders’ equity and cash flows for each of the three years in the period ended May 31, 2026, and the related notes and our report dated June 22, 2026 expressed an unqualified opinion thereon.

  
Common Stock [Member]    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol ORCL  
Security Exchange Name NYSE  
Depositary Shares, Series D Convertible Preferred Stock [Member]    
Document Information [Line Items]    
Title of 12(b) Security Depositary Shares, each representing a 1/2,000th interest in a share of 6.50% Series D Mandatory Convertible Preferred Stock, par value $0.01 per  
Trading Symbol ORCL PRD  
Security Exchange Name NYSE