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Subsequent Events (Details Narrative) - USD ($)
1 Months Ended 9 Months Ended
May 22, 2019
May 10, 2019
May 22, 2019
Apr. 30, 2019
Apr. 30, 2019
Payment of Promissory Note       $ 320,000 $ 320,000
Subsequent Event [Member]          
Subsequent event description   On May 10, 2019, 4,000,000 shares of Generex common stock was transferred out of the Friends of Generex Biotechnology Investment Trust (the “Trust”) in consideration of 592,683 Series A voting preferred of Olaregen held by an existing shareholder in Olaregen. A $2,000,000 promissory note from Genrex to the existing shareholder in Olaregen remains outstanding. The 592,683 represents approximately 10% voting control of Olaregen. The $2,000,000 was extended to have a maturity date of August 1, 2019. Subsequent to this transaction, there are 2,366,187 Olaregen shares that belong to non-controlling interest shareholders which represents a 37.9% non-controlling interest.      
Number of stock transferred   400,000      
Obligation for stock transferred   $ 1,000,000      
Payment of Promissory Note $ 4,361,500   $ 4,800,000