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Stockholders' (Deficiency)/Equity (Details Narrative) (USD $)
6 Months Ended
Jan. 31, 2015
Jul. 31, 2014
Jan. 15, 2014
Jan. 14, 2014
Common stock issued, or committed to issue, Shares 2,460,000us-gaap_CommonStockSharesIssued 778,512,092us-gaap_CommonStockSharesIssued    
Common stock issued, or committed to issue, Amount $ 66,369us-gaap_CommonStockValue $ 778,512us-gaap_CommonStockValue    
Common stock, value per share $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare    
Warrants Outstanding 248,860,953us-gaap_ClassOfWarrantOrRightOutstanding      
Number of shares to be purchased, exercise price $ 0.03us-gaap_FairValueAssumptionsExercisePrice $ 0.03us-gaap_FairValueAssumptionsExercisePrice    
Series F Convertible Preferred Stock        
Conversion of shares of Series F, Convertible Preferred Stock 217GNBT_ConversionOfSharesOfSeriesFConvertiblePreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
     
Make-Whole Dividend Payments        
Common stock issued, or committed to issue, Shares 2,799,402us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= GNBT_MakeWholeDividendPaymentsMember
     
Upon Exercise Of Options        
Common stock issued, or committed to issue, Shares 542,154us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= GNBT_UponExerciseOfOptionsMember
     
Common stock, value per share $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= GNBT_UponExerciseOfOptionsMember
     
Cash proceeds 542GNBT_ProceedsFromIssuanceOfWarrants1
/ us-gaap_StatementClassOfStockAxis
= GNBT_UponExerciseOfOptionsMember
     
Series E Convertible Preferred Stock        
Common stock issued, or committed to issue, Shares     2,450us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
 
Common stock, value per share     $ 1,000us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
 
Warrants Outstanding, Exercise price $0.76        
Total Warrants Outstanding, Shares 8,470,661GNBT_Warrants
/ us-gaap_ClassOfWarrantOrRightAxis
= GNBT_WarrantExercise76Member
     
Outstanding warrants, weighted average exercise price $ 0.76GNBT_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= GNBT_WarrantExercise76Member
     
Outstanding warrants, weighted average remaining life (in years) 2 years 8 months 15 days      
Warrants Outstanding, Exercise Price $0.03        
Total Warrants Outstanding, Shares 239,788,852GNBT_Warrants
/ us-gaap_ClassOfWarrantOrRightAxis
= GNBT_WarrantExercisePrice03Member
     
Outstanding warrants, weighted average exercise price $ 0.03GNBT_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= GNBT_WarrantExercisePrice03Member
     
Derivative Warrant Liability        
Warrants, Total 1,490,858us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= GNBT_DerivativeWarrantLiabilityMember
     
Total Warrants Outstanding, Shares 239,788,852GNBT_Warrants
/ us-gaap_ClassOfWarrantOrRightAxis
= GNBT_DerivativeWarrantLiabilityMember
     
Series E Convertible Preferred Stock        
Common stock issued, or committed to issue, Amount       $ 26,666,668us-gaap_CommonStockValue
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_SeriesEPreferredStockMember