Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Name:	us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

OTHER ASSETS - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Schedule of Equity Method Investments [Line Items]
OpenText share in net income of equity investees (note 9)	$ 8,700	$ 13,668	$ 5,965
Minimum
Schedule of Equity Method Investments [Line Items]
Ownership percentage	4.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%