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BASIS OF PRESENTATION - Additional Information (Details) | Jun. 30, 2020
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OT South Africa |
Noncontrolling Interest [Line Items] |
Ownership percentage by Open Text | 70.00%
GXS Singapore |
Noncontrolling Interest [Line Items] |
Ownership percentage by Open Text | 81.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_OwnershipAxis=otex_OpenTextSouthAfricaProprietaryLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_OwnershipAxis=otex_EC1Pte.LtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |