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Acquired Intangible Assets (Calculation Of Acquired Intangibles By Asset Class) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Mar. 31, 2015
Jun. 30, 2014
Finite-Lived Intangible Assets, Net [Abstract]    
Cost $ 1,697,774us-gaap_FiniteLivedIntangibleAssetsGross $ 1,573,463us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization (967,101)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (848,145)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net 730,673us-gaap_FiniteLivedIntangibleAssetsNet 725,318us-gaap_FiniteLivedIntangibleAssetsNet
Technology Assets [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Cost 768,714us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= otex_TechnologyAssetsMember
699,206us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= otex_TechnologyAssetsMember
Accumulated Amortization (528,398)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= otex_TechnologyAssetsMember
(473,043)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= otex_TechnologyAssetsMember
Net 240,316us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= otex_TechnologyAssetsMember
226,163us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= otex_TechnologyAssetsMember
Weighted-average amortization period (in years) for acquired intangible assets 5 years  
Customer Assets [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Cost 929,060us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= otex_CustomerAssetsMember
874,257us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= otex_CustomerAssetsMember
Accumulated Amortization (438,703)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= otex_CustomerAssetsMember
(375,102)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= otex_CustomerAssetsMember
Net $ 490,357us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= otex_CustomerAssetsMember
$ 499,155us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= otex_CustomerAssetsMember
Weighted-average amortization period (in years) for acquired intangible assets 6 years