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Acquisitions - Acquisition of Guidance Software (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 14, 2017
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Aug. 31, 2017
Purchase Price Allocation          
Goodwill   $ 3,580,129 $ 3,732,669    
Guidance Software Inc.          
Business Acquisition [Line Items]          
Purchase consideration $ 240,538        
Business Combination, Consideration Transferred [Abstract]          
Cash consideration 237,291        
Guidance shares already owned by OpenText through open market purchases (at fair value) 3,247        
Purchase consideration 240,538        
Purchase Price Allocation          
Current assets 24,744        
Non-current tangible assets 11,583        
Liabilities assumed (48,670)        
Total identifiable net assets 110,738        
Goodwill 129,800        
Net assets acquired 240,538        
Cash acquired from acquisition 5,700        
Goodwill expected to be tax deductible 1,900        
Deferred revenue 26,600        
Deferred revenue adjustment 7,600        
Acquired receivables, fair value 10,300        
Acquired receivables, gross contractual amount 11,800        
Acquired receivables, estimated uncollectible 1,500        
Remeasurement gain   $ 800      
Guidance Software Inc. | Appraisal Proceedings          
Business Combination, Consideration Transferred [Abstract]          
Loss contingency accrual 2,300     $ 2,300 $ 10,800
Guidance Software Inc. | Customer assets          
Purchase Price Allocation          
Acquired intangible assets 71,230        
Guidance Software Inc. | Technology assets          
Purchase Price Allocation          
Acquired intangible assets $ 51,851