PENSION PLANS AND OTHER POST-RETIREMENT BENEFITS - Additional Information (Details)	Dec. 31, 2025 plan
Retirement Benefits [Abstract]
Number of pension and postretirement plans (in plans)	45
Geographic concentration percentage of pension obligations	48.00%

Defined Benefit Plan, Percentage Of Pension Obligations by Geographic Location

No definition available.

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Namespace Prefix:	otex_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant