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Stock-Based Compensation (Details Narrative)
9 Months Ended
Apr. 30, 2015
Stock Option Plan 2001  
Common stock reserved for future issuance 12,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= GNBT_StockOptionPlan2001Member
Common stock reserved for future awards 2,338,916us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecrease
/ us-gaap_PlanNameAxis
= GNBT_StockOptionPlan2001Member
Stock Option Plan 2006  
Common stock reserved for future issuance 135,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= GNBT_StockOptionPlan2006Member
Common stock reserved for future awards 81,530,576us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecrease
/ us-gaap_PlanNameAxis
= GNBT_StockOptionPlan2006Member
Stock Options  
Outstanding options 30,333,074us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= us-gaap_StockOptionMember
Outstanding options, weighted average remaining contractual term 2 years 9 months