ACCOUNTS PAYABLE AND ACCRUED LIABILITIES - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020
Accounts Payable and Accrued Liabilities [Abstract]
Present value of asset retirement obligation	$ 17.4	$ 17.3
Undiscounted value of asset retirement obligation	$ 18.9	$ 18.7

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