Accounts Payable and Accrued Liabilities - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2017	Jun. 30, 2017
Accounts Payable and Accrued Liabilities [Abstract]
Present value of asset retirement obligation	$ 15.0	$ 13.4
Undiscounted value of asset retirement obligation	$ 16.8	$ 15.0

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.

No definition available.

Name:	otex_AssetRetirementObligationPresentValue
Namespace Prefix:	otex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant