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Basis of Presentation - Additional Information (Details) | Sep. 30, 2016
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OT South Africa |
Noncontrolling Interest [Line Items] |
Ownership percentage by Open Text | 90.00%
GXS Korea |
Noncontrolling Interest [Line Items] |
Ownership percentage by Open Text | 85.00%
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_
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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: | dei_LegalEntityAxis=otex_OpenTextSouthAfricaProprietaryLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=otex_GXSKoreaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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