EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Basic earnings per share
Net income attributable to OpenText	$ 103,376	$ 74,401
Basic earnings per share attributable to OpenText (in dollars per share)	$ 0.38	$ 0.28
Diluted earnings per share
Net income attributable to OpenText	$ 103,376	$ 74,401
Diluted earnings per share attributable to OpenText (in dollars per share)	$ 0.38	$ 0.27
Weighted-average number of shares outstanding (in 000's)
Basic (in shares)	271,986	270,013
Effect of dilutive securities (in shares)	861	1,238
Diluted (in shares)	272,847	271,251
Excluded as anti-dilutive (in shares)	3,944	2,174