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BASIS OF PRESENTATION (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 30, 2020
Noncontrolling Interest [Line Items]    
Decrease in retained earnings $ (2,093,076) $ (2,159,396)
Allowance for credit loss, current (445,841) (466,357)
Decrease in contract assets (27,460) (29,570)
Increase to deferred tax assets $ 866,788 911,565
Adjustment    
Noncontrolling Interest [Line Items]    
Decrease in retained earnings   2,500
Allowance for credit loss, current   3,000
Decrease in contract assets   300
Increase to deferred tax assets   $ 800
OT South Africa    
Noncontrolling Interest [Line Items]    
Ownership percentage by Open Text 70.00%  
GXS Singapore    
Noncontrolling Interest [Line Items]    
Ownership percentage by Open Text 81.00%