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Share Capital, Option Plans And Share-Based Payments Share Capital, Option Plans And Share-Based Payments (Schedule of Long Term Incentive Plan Expense) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Unvested stock awards compensation cost, weighted average recognition period     2 years 7 months 6 days  
Long Term Incentive Plan        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Compensation cost not yet recognized $ 13.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_PlanNameAxis
= otex_LongTermIncentivePlanMember
  $ 13.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_PlanNameAxis
= otex_LongTermIncentivePlanMember
 
Unvested stock awards compensation cost, weighted average recognition period     1 year 11 months 1 day  
Employee Share Purchase Plan [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Cash received from employee stock purchase plan $ 0.7otex_CashReceivedFromEmployeeStockPurchasePlan
/ us-gaap_AwardTypeAxis
= otex_EmployeeSharePurchasePlanMember
$ 0.8otex_CashReceivedFromEmployeeStockPurchasePlan
/ us-gaap_AwardTypeAxis
= otex_EmployeeSharePurchasePlanMember
$ 2.2otex_CashReceivedFromEmployeeStockPurchasePlan
/ us-gaap_AwardTypeAxis
= otex_EmployeeSharePurchasePlanMember
$ 2.1otex_CashReceivedFromEmployeeStockPurchasePlan
/ us-gaap_AwardTypeAxis
= otex_EmployeeSharePurchasePlanMember