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Deferred Charges and Credits (Details)	12 Months Ended
	Jun. 30, 2018
Minimum
Schedule of Deferred Charges and Credits [Line Items]
Deferred charges and credits amortization, period	6 years
Maximum
Schedule of Deferred Charges and Credits [Line Items]
Deferred charges and credits amortization, period	15 years

X

- Definition

Deferred Charges Amortization Period

+ References

No definition available.

+ Details

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Namespace Prefix:	otex_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

[Line Items] for Schedule of Deferred Charges and Credits [Table]

+ References

No definition available.

+ Details

Name:	otex_ScheduleofDeferredChargesandCreditsLineItems
Namespace Prefix:	otex_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: