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Accounts Payable and Accrued Liabilities - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jun. 30, 2018
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Accounts Payable and Accrued Liabilities [Abstract] |  |
Present value of asset retirement obligation | $ 15.3 | $ 15.7
Undiscounted value of asset retirement obligation | $ 17.1 | $ 17.7

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- Definition The present value of a liability for an asset retirement obligation associated with the disposal or retirement of a tangible long-lived asset that results from acquisition, construction or development, or the normal operations of a long-lived asset including obligations from operating leases. + References No definition available. + Details
Name: | otex_AssetRetirementObligationPresentValue
Namespace Prefix: | otex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Asset Retirement Obligation Undiscounted Value + References No definition available. + Details
Name: | otex_AssetRetirementObligationUndiscountedValue
Namespace Prefix: | otex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration