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Fair Value of Financial Instruments (Details 2) (Cross currency swaps, Level 3, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
Level 3 activity          
Beginning balance: $ (6,882)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ (27,359)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ (18,630)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ (22,254)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue  
Unrealized gain (loss) on cross currency swaps 15,692us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings (1,862)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings 27,440us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings (6,967)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings  
Ending balance: $ 8,810us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ (29,221)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ 8,810us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ (29,221)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue  
Minimum
         
Fair Value Measurements          
Performance risk for derivative contracts as a percentage of unadjusted liabilities     6.00%nty_DerivativePerformanceRiskAsPercentageOfUnadjustedLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_CurrencySwapMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
  8.10%nty_DerivativePerformanceRiskAsPercentageOfUnadjustedLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_CurrencySwapMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum
         
Fair Value Measurements          
Performance risk for derivative contracts as a percentage of unadjusted liabilities     9.70%nty_DerivativePerformanceRiskAsPercentageOfUnadjustedLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_CurrencySwapMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
  8.50%nty_DerivativePerformanceRiskAsPercentageOfUnadjustedLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_CurrencySwapMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Weighted average
         
Fair Value Measurements          
Performance risk for derivative contracts as a percentage of unadjusted liabilities     8.20%nty_DerivativePerformanceRiskAsPercentageOfUnadjustedLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_CurrencySwapMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
  8.30%nty_DerivativePerformanceRiskAsPercentageOfUnadjustedLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_CurrencySwapMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember