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Derivative Liabilities - Derivative warrant liability (Details) (USD $)	6 Months Ended	12 Months Ended
	Jan. 31, 2015	Jul. 31, 2014
Balance - Derivative warrant liability Value	$ 2,635,643us-gaap_DerivativeLiabilitiesCurrent	$ 5,234,293us-gaap_DerivativeLiabilitiesCurrent
No. of Warrants - Derivative warrant liability	239,788,852	220,687,537
Exercise of Warrants		(2,194,496)GNBT_ExerciseOfWarrants
Warrants Exercised		(76,732,020)GNBT_WarrantsExercised
Decrease in fair value of derivative warrant liability	(1,144,785)us-gaap_DerivativeLossOnDerivative
Balance - Derivative warrant liability Value	1,490,858us-gaap_DerivativeLiabilitiesCurrent	2,635,643us-gaap_DerivativeLiabilitiesCurrent
No. of Warrants - Derivative warrant liability	239,788,852	239,788,852
January 2014
Additional warrants issued	942,279
Warrants Issued	26,666,668
March 2014
Additional warrants issued	$ 2,016,064
Warrants Issued	69,166,667

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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