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4. Debt Summary Of Maturities And Percentage Of Redemption Price Of Unsecured Notes (Details) (Unsecured Notes due 2021 [Member])
Mar. 31, 2015
2016  
Debt Instrument [Line Items]  
Redemption Price 104.406%dft_PercentageOfRedemptionPrice
/ us-gaap_DebtInstrumentAxis
= dft_UnsecuredNotesdue2021Member
/ dft_LongTermDebtByMaturityAxis
= dft_TwelveMonthPeriodCommencingSeptemberFifteenTwoThousandSixteenMember
2017  
Debt Instrument [Line Items]  
Redemption Price 102.938%dft_PercentageOfRedemptionPrice
/ us-gaap_DebtInstrumentAxis
= dft_UnsecuredNotesdue2021Member
/ dft_LongTermDebtByMaturityAxis
= dft_TwelveMonthPeriodCommencingSeptemberFifteenTwoThousandSeventeenMember
2018  
Debt Instrument [Line Items]  
Redemption Price 101.469%dft_PercentageOfRedemptionPrice
/ us-gaap_DebtInstrumentAxis
= dft_UnsecuredNotesdue2021Member
/ dft_LongTermDebtByMaturityAxis
= dft_TwelveMonthPeriodCommencingSeptemberFifteenTwoThousandEighteenMember
2019 and thereafter  
Debt Instrument [Line Items]  
Redemption Price 100.00%dft_PercentageOfRedemptionPrice
/ us-gaap_DebtInstrumentAxis
= dft_UnsecuredNotesdue2021Member
/ dft_LongTermDebtByMaturityAxis
= dft_CommencingSeptemberFifteenTwoThousandNineteenandThereafterMember