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Basis of Presentation - Additional Information (Details)	Jun. 30, 2018
OT South Africa
Noncontrolling Interest [Line Items]
Ownership percentage by Open Text	70.00%
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%

X

- 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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- 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_
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X

- Details

Name:	dei_LegalEntityAxis=otex_OpenTextSouthAfricaProprietaryLtdMember
Namespace Prefix:
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Balance Type:
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X

- Details

Name:	dei_LegalEntityAxis=otex_GXSKoreaMember
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Period Type:

X

- Details

Name:	dei_LegalEntityAxis=otex_EC1Pte.LtdMember
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