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Patent and Technology License Agreements (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 15, 2025
Jul. 15, 2025
Sep. 30, 2021
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Patent and Technology License Agreements [Line Items]                
Fee expense             $ 90,000 $ 90,000
Royalty rate, percentage           15.00%    
Increasing annual royalties           $ 1,100,000    
Research and development       $ 3,766,525 $ 3,605,898 5,893,563 $ 6,227,808  
Upfront payment           250,000    
Development milestone payments       22,000,000   22,000,000    
Commercial sales milestones       300,000,000   300,000,000    
Forecast [Member]                
Patent and Technology License Agreements [Line Items]                
Revenue percentage 2.00%              
Milestone payments $ 2,197,892              
Payment cost   $ 2,350,000            
Citius Oncology [Member]                
Patent and Technology License Agreements [Line Items]                
Development milestone payments       2,650,000   2,650,000    
Patent and Technology License Agreement – Mino-Lok [Member]                
Patent and Technology License Agreements [Line Items]                
Annual minimum royalty payment           100,000    
Increasing annual royalties           25,000    
License Agreement Eterna [Member]                
Patent and Technology License Agreements [Line Items]                
Obligated pay amount       $ 51,000,000   $ 51,000,000    
Revenue percentage       50.00%   50.00%    
License Agreement Eterna [Member] | NoveCite [Member]                
Patent and Technology License Agreements [Line Items]                
Research and development     $ 5,000,000          
Percentage of ownership additional shares           25.00%    
License Agreement Eterna [Member] | License Agreement [Member]                
Patent and Technology License Agreements [Line Items]                
Outstanding equity     75.00%          
License Agreement with Eisai [Member]                
Patent and Technology License Agreements [Line Items]                
Research and development           $ 33,400,000    
NetSalesPercentage           50.00%    
Milestone payments           $ 5,900,000    
Paying an extension fee       $ 10,000,000   10,000,000    
License Agreement with Eisai [Member] | Forecast [Member]                
Patent and Technology License Agreements [Line Items]                
Development milestone payments   $ 2,535,318            
LYMPHIR [Member]                
Patent and Technology License Agreements [Line Items]                
Milestone payments           27,500,000    
LYMPHIR [Member] | Citius Oncology [Member]                
Patent and Technology License Agreements [Line Items]                
License payable           5,000,000    
FDA [Member] | Citius Oncology [Member]                
Patent and Technology License Agreements [Line Items]                
Milestone payments           33,400,000    
Dr. Reddy’s Laboratories, Ltd [Member]                
Patent and Technology License Agreements [Line Items]                
Development milestone payments       22,500,000   22,500,000    
Dr. Reddy’s Laboratories, Ltd [Member] | License Agreement with Eisai [Member]                
Patent and Technology License Agreements [Line Items]                
Upfront payment           40,000,000    
Dr. Reddy’s Laboratories, Ltd [Member] | CTCL [Member]                
Patent and Technology License Agreements [Line Items]                
Development milestone payments       40,000,000   $ 40,000,000    
Minimum [Member]                
Patent and Technology License Agreements [Line Items]                
Royalty rate, percentage           10.00%    
Minimum [Member] | Royalty [Member]                
Patent and Technology License Agreements [Line Items]                
Royalty rate, percentage           2.00%    
Minimum [Member] | License Agreement Eterna [Member]                
Patent and Technology License Agreements [Line Items]                
Royalty rate, percentage           4.00%    
Minimum [Member] | License Agreement Eterna [Member] | Royalty [Member]                
Patent and Technology License Agreements [Line Items]                
Royalty rate, percentage           8.00%    
Minimum [Member] | License Agreement with Eisai [Member] | Royalty [Member]                
Patent and Technology License Agreements [Line Items]                
Royalty rate, percentage           10.00%    
Maximum [Member]                
Patent and Technology License Agreements [Line Items]                
Royalty rate, percentage           15.00%    
Maximum [Member] | Royalty [Member]                
Patent and Technology License Agreements [Line Items]                
Royalty rate, percentage           7.00%    
Maximum [Member] | Patent and Technology License Agreement – Mino-Lok [Member]                
Patent and Technology License Agreements [Line Items]                
Increasing annual royalties           $ 150,000    
Maximum [Member] | License Agreement with Eisai [Member]                
Patent and Technology License Agreements [Line Items]                
Development milestone payments       $ 70,000,000   $ 70,000,000    
Maximum [Member] | License Agreement with Eisai [Member] | Royalty [Member]                
Patent and Technology License Agreements [Line Items]                
Royalty rate, percentage           15.00%    
NoveCite [Member] | License Agreement Eterna [Member]                
Patent and Technology License Agreements [Line Items]                
Minority equity interest     25.00%