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Accounts Payable and Accrued Liabilities - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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