SEGMENT INFORMATION - Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Revenues
Total revenues	$ 1,326,736	$ 1,334,500	$ 2,614,871	$ 2,603,505
Operating expenses:
Net (income) attributable to non-controlling interests	(35)	(44)	(79)	(98)
Net income attributable to OpenText	168,091	229,862	314,707	314,230
Reportable Segment
Revenues
Total revenues	1,326,736	1,334,500	2,614,871	2,603,505
Cost of revenues:
Adjusted cost of revenues	296,826	304,113	599,940	610,674
Adjusted gross profit	1,029,910	1,030,387	2,014,931	1,992,831
Operating expenses:
Adjusted research and development	153,470	173,071	318,989	355,597
Adjusted sales and marketing	280,158	262,706	530,317	499,273
Adjusted general and administrative	105,061	93,082	206,949	192,578
Net (income) attributable to non-controlling interests	(35)	(44)	(79)	(98)
Adjusted EBITDA	491,186	501,484	958,597	945,285
Reconciling items	323,095	271,622	643,890	631,055
Net income attributable to OpenText	$ 168,091	$ 229,862	$ 314,707	$ 314,230