SPECIAL CHARGES (RECOVERIES) - Schedule of Restructuring Reserve (Details) $ in Thousands	12 Months Ended
Jun. 30, 2026 USD ($)
Micro Focus Acquisition Restructuring Plan
Restructuring Reserve [Roll Forward]
Balance, beginning	$ 8,595
Accruals and adjustments	603
Cash payments	(5,343)
Foreign exchange and other non-cash adjustments	1,099
Balance, end	4,954
Micro Focus Acquisition Restructuring Plan \| Workforce reduction
Restructuring Reserve [Roll Forward]
Balance, beginning	1,170
Accruals and adjustments	523
Cash payments	(1,624)
Foreign exchange and other non-cash adjustments	525
Balance, end	594
Micro Focus Acquisition Restructuring Plan \| Facility charges
Restructuring Reserve [Roll Forward]
Balance, beginning	7,425
Accruals and adjustments	80
Cash payments	(3,719)
Foreign exchange and other non-cash adjustments	574
Balance, end	4,360
Business Optimization Plan
Restructuring Reserve [Roll Forward]
Balance, beginning	51,129
Accruals and adjustments	85,507
Cash payments	(80,495)
Foreign exchange and other non-cash adjustments	(4,873)
Balance, end	51,268
Business Optimization Plan \| Workforce reduction
Restructuring Reserve [Roll Forward]
Balance, beginning	48,283
Accruals and adjustments	75,868
Cash payments	(78,770)
Foreign exchange and other non-cash adjustments	(750)
Balance, end	44,631
Business Optimization Plan \| Facility charges
Restructuring Reserve [Roll Forward]
Balance, beginning	2,846
Accruals and adjustments	9,639
Cash payments	(1,725)
Foreign exchange and other non-cash adjustments	(4,123)
Balance, end	$ 6,637

Payments (Recoveries) For Restructuring

No definition available.

Name:	otex_PaymentsRecoveriesForRestructuring
Namespace Prefix:	otex_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Restructuring Reserve, Foreign Currency Translation Gain (Loss) and Settled without Cash

+ References

No definition available.

+ Details

Name:	otex_RestructuringReserveForeignCurrencyTranslationGainLossandSettledwithoutCash
Namespace Prefix:	otex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

+ Details

Name:	us-gaap_RestructuringReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

+ Details

Name:	us-gaap_RestructuringReserveAccrualAdjustment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringReserveRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RestructuringPlanAxis=otex_MicroFocusAcquisitionRestructuringPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=otex_WorkforceReductionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_FacilityClosingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringPlanAxis=otex_BusinessOptimizationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: