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Common Stock, Stock Options, Restricted Stock Awards, and Warrants - Schedule of Option Activity Under Our Stock Option Plans (Details) - Stock Option [Member] - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Option Shares, Outstanding Ending balance 656,084 839,510 656,084
Weighted- Average Exercise Price, Outstanding Ending balance (in Dollars per share) $ 36.41 $ 30.09 $ 36.41
Weighted- Average Remaining Contractual Term, Outstanding Ending balance 7 years 3 months 3 days 6 years 10 months 24 days  
Aggregate Intrinsic Value, Outstanding Ending balance (in Dollars) $ 0 $ 0 $ 0
Exercisable at September 30, 2025 512,509   512,509
Exercisable at September 30, 2025 (in Dollars per share) $ 39.7   $ 39.7
Exercisable at September 30, 2025     5 years 10 months 17 days
Exercisable at September 30, 2025 (in Dollars) $ 0   $ 0
Option Shares, Granted   185,000  
Weighted- Average Exercise Price, Granted (in Dollars per share)   $ 9.5  
Option Shares, Exercised    
Option Shares, Forfeited or expired   (1,574)  
Weighted- Average Exercise Price, Forfeited or expired (in Dollars per share)   $ 242.8  
Citius Oncology [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Option Shares, Outstanding Ending balance 12,750,000 18,100,000 12,750,000
Weighted- Average Exercise Price, Outstanding Ending balance (in Dollars per share) $ 2.15 $ 1.83 $ 2.15
Weighted- Average Remaining Contractual Term, Outstanding Ending balance   8 years 2 months 15 days 8 years 9 months 10 days
Aggregate Intrinsic Value, Outstanding Ending balance (in Dollars) $ 5,386,000
Exercisable at September 30, 2025 9,781,250   9,781,250
Exercisable at September 30, 2025 (in Dollars per share) $ 2.02   $ 2.02
Exercisable at September 30, 2025     7 years 11 months 8 days
Exercisable at September 30, 2025 (in Dollars) $ 1,136,500   $ 1,136,500
Option Shares, Granted   5,750,000  
Weighted- Average Exercise Price, Granted (in Dollars per share)   $ 1.07  
Option Shares, Forfeited or expired   (400,000)