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Derivative Liabilities (Details Narrative) (USD $)
3 Months Ended 6 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jul. 31, 2014
Jan. 31, 2014
Recognition of gain due to derivative liability $ 408,697us-gaap_DerivativeGainLossOnDerivativeNet $ (2,107,844)us-gaap_DerivativeGainLossOnDerivativeNet $ 1,120,675us-gaap_DerivativeGainLossOnDerivativeNet $ (230,557)us-gaap_DerivativeGainLossOnDerivativeNet  
Fair value of derivative liability 1,490,858us-gaap_DerivativeFairValueOfDerivativeLiability   1,490,858us-gaap_DerivativeFairValueOfDerivativeLiability 2,635,643us-gaap_DerivativeFairValueOfDerivativeLiability  
Issuing Additional Warrants          
Derivative warrants weighted average remaining life     2 years 9 months    
Recognition of gain due to derivative liability     1,144,785us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= GNBT_IssuingAdditionalWarrantsMember
  1,048,859us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= GNBT_IssuingAdditionalWarrantsMember
Additional investment rights     24,109GNBT_AdjustmentsToAdditionalPaidInCapitalExerciseOfAdditionalInvestmentRights
/ us-gaap_DerivativeByNatureAxis
= GNBT_IssuingAdditionalWarrantsMember
  194,512GNBT_AdjustmentsToAdditionalPaidInCapitalExerciseOfAdditionalInvestmentRights
/ us-gaap_DerivativeByNatureAxis
= GNBT_IssuingAdditionalWarrantsMember
Additional paid in capital     237,566us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
/ us-gaap_DerivativeByNatureAxis
= GNBT_IssuingAdditionalWarrantsMember
  237,566us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
/ us-gaap_DerivativeByNatureAxis
= GNBT_IssuingAdditionalWarrantsMember
Additional recognition of gain, “Change in fair value of derivative liabilities”     892,399us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_DerivativeByNatureAxis
= GNBT_IssuingAdditionalWarrantsMember
  828,428us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_DerivativeByNatureAxis
= GNBT_IssuingAdditionalWarrantsMember
Recognition of Gain          
Additional investment rights     194,512GNBT_AdjustmentsToAdditionalPaidInCapitalExerciseOfAdditionalInvestmentRights
/ us-gaap_DerivativeByNatureAxis
= GNBT_RecognitionOfGainMember
   
Issuing Additiona Investment Rights          
Fair value of derivative liability $ 743,198us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= GNBT_IssuingAdditionalInvestmentRightsMember
  $ 743,198us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= GNBT_IssuingAdditionalInvestmentRightsMember
$ 719,088us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= GNBT_IssuingAdditionalInvestmentRightsMember