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DOCUMENT AND ENTITY INFORMATION - USD ($)
12 Months Ended
May. 31, 2015
Jun. 18, 2015
Nov. 28, 2014
Document and Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date May 31, 2015    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2015    
Trading Symbol ORCL    
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 Common Stock, Shares Outstanding (in shares)   4,336,077,000  
Entity Public Float (in dollars)     $ 136,863,594,000