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Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $)
Mar. 31, 2015
Jan. 15, 2015
Jun. 30, 2014
Debt Instrument [Line Items]      
Long-term debt, Mortgage $ 7,802,000us-gaap_SecuredDebt   $ 9,582,000us-gaap_SecuredDebt
Long-term debt, Total 1,597,802,000us-gaap_LongTermDebt   1,319,332,000us-gaap_LongTermDebt
Less:      
Current portion of long-term debt, Mortgage 7,802,000us-gaap_SecuredDebtCurrent   9,582,000us-gaap_SecuredDebtCurrent
Current portion of long-term debt 15,802,000us-gaap_LongTermDebtCurrent   62,582,000us-gaap_LongTermDebtCurrent
Non-current portion of long-term debt 1,582,000,000us-gaap_LongTermLoansFromBank   1,256,750,000us-gaap_LongTermLoansFromBank
Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes, Noncurrent 800,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
  0us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
Less:      
Debt Instrument, Face Amount   800,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
 
Debt Instrument, Interest Rate, Stated Percentage   5.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
 
Term Loan A [Member]      
Debt Instrument [Line Items]      
Long-term debt, Term Loan 0us-gaap_LoansPayableToBank
/ us-gaap_DebtInstrumentAxis
= otex_TermLoanAMember
  513,750,000us-gaap_LoansPayableToBank
/ us-gaap_DebtInstrumentAxis
= otex_TermLoanAMember
Less:      
Current portion of long-term debt, Term Loan 0us-gaap_LoansPayableToBankCurrent
/ us-gaap_DebtInstrumentAxis
= otex_TermLoanAMember
  45,000,000us-gaap_LoansPayableToBankCurrent
/ us-gaap_DebtInstrumentAxis
= otex_TermLoanAMember
Term Loan B [Member]      
Debt Instrument [Line Items]      
Long-term debt, Term Loan 790,000,000us-gaap_LoansPayableToBank
/ us-gaap_DebtInstrumentAxis
= otex_TermLoanBMember
  796,000,000us-gaap_LoansPayableToBank
/ us-gaap_DebtInstrumentAxis
= otex_TermLoanBMember
Less:      
Current portion of long-term debt, Term Loan $ 8,000,000us-gaap_LoansPayableToBankCurrent
/ us-gaap_DebtInstrumentAxis
= otex_TermLoanBMember
  $ 8,000,000us-gaap_LoansPayableToBankCurrent
/ us-gaap_DebtInstrumentAxis
= otex_TermLoanBMember