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Income Taxes (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2014
Income Tax Disclosure [Abstract]          
Effective Income Tax Rate Reconciliation, Percent (1.20%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 22.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 17.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 27.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 1,500,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount   $ 1,300,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount    
Change in Net Expense of Unrecognized Tax Benefits with related Interest and Penalties     2,400,000otex_ChangeinNetExpenseofUnrecognizedTaxBenefitswithrelatedInterestandPenalties    
Effective Income Tax Rate Reconciliation, Increase in Net Expense of Unrecognized Tax Benefits (13,300,000)otex_EffectiveIncomeTaxRateReconciliationIncreaseinNetExpenseofUnrecognizedTaxBenefits   (13,200,000)otex_EffectiveIncomeTaxRateReconciliationIncreaseinNetExpenseofUnrecognizedTaxBenefits    
Effective Income Tax Rate Reconciliation, Deduction, Amount     4,800,000otex_ImpactofNonDeductibleAmortizationExpense    
Tax Impact on lower Income 10,800,000otex_TaxImpactonlowerIncome        
Income Taxes impact of Adjustments upon Filing Tax Returns 1,500,000otex_IncomeTaxesimpactofAdjustmentsuponFilingTaxReturns   3,800,000otex_IncomeTaxesimpactofAdjustmentsuponFilingTaxReturns    
Income Tax Reconciliation Effect of Permanent Difference 1,300,000otex_IncomeTaxReconciliationEffectofPermanentDifference        
Interest expense accrued 30,098,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued [1]   30,098,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued [1]   26,235,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued [1]
Penalties accrued 6,488,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued [1]   6,488,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued [1]   7,858,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued [1]
Increase (decrease) in gross unrecognized tax benefit in next 12 months (35,900,000)us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound   (35,900,000)us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound    
Taxes paid on cash distribution $ 8,900,000otex_TaxesPaidOnCashDistribution   $ 8,900,000otex_TaxesPaidOnCashDistribution   $ 7,600,000otex_TaxesPaidOnCashDistribution
[1] These balances have been included within "Long-term income taxes payable" within the Condensed Consolidated Balance Sheets.