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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Jun. 30, 2018
Jul. 31, 2018
Dec. 31, 2017
Document And Entity Information [Abstract]      
Entity Registrant Name OPEN TEXT CORP    
Entity Central Index Key 0001002638    
Current Fiscal Year End Date --06-30    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Jun. 30, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Trading Symbol otex    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   267,846,320  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 9.3