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Stockholders’ Deficiency - Accounting allocation of initial proceeds (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jul. 31, 2014
Mar. 27, 2014
Net proceeds        $ 750,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock  
Deemed dividend    408,279us-gaap_DividendsPreferredStock    408,279us-gaap_DividendsPreferredStock  
Series E Convertible Preferred Stock          
Net proceeds     750,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
   
Derivative warrant liability fair value     (942,279)GNBT_DerivativeWarrantLiabilityFairValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
   
Other issuance costs (finders' fee)     (64,000)us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
   
Make whole payments liability     (216,000)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
   
Deemed dividend     (472,279)us-gaap_DividendsPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
   
Series F Convertible Preferred Stock          
Net proceeds     2,020,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
  2,020,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
Derivative warrant liability fair value     (2,016,064)GNBT_DerivativeWarrantLiabilityFairValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
   
Derivative additional investment rights fair value     (863,735)GNBT_DerivativeAdditionalInvestmentRightsFairValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
   
Other issuance costs (finders' fee)     (166,000)us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
   
Make whole payments liability     (560,250)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
   
Deemed dividend     $ (1,586,050)us-gaap_DividendsPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember