EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Basic earnings per share
Net income attributable to OpenText	$ 168,091	$ 229,862	$ 314,707	$ 314,230
Basic earnings per share attributable to OpenText (in dollars per share)	$ 0.67	$ 0.87	$ 1.24	$ 1.18
Diluted earnings per share
Net income attributable to OpenText	$ 168,091	$ 229,862	$ 314,707	$ 314,230
Diluted earnings per share attributable to OpenText (in dollars per share)	$ 0.66	$ 0.87	$ 1.24	$ 1.18
Weighted-average number of shares outstanding (in ‘000’s)
Basic (in shares)	251,983	265,099	252,814	266,252
Effect of dilutive securities (in shares)	1,750	94	592	253
Diluted (in shares)	253,733	265,193	253,406	266,505
Excluded as anti-dilutive (in shares)	5,142	11,338	6,647	10,982