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Patent and Technology License Agreements (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 28, 2025
Jul. 15, 2025
Jul. 10, 2025
Aug. 31, 2024
Sep. 30, 2021
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jul. 21, 2025
Patent and Technology License Agreements [Line Items]                    
Fee expense               $ 90,000 $ 90,000  
Increasing annual royalties               1,100,000    
Research and development       $ 33,400,000   $ 1,621,325 $ 2,763,865 7,514,888 $ 8,991,673  
Upfront payment               420,168    
Development milestone payments           22,000,000   22,000,000    
Commercial sales milestones           300,000,000   300,000,000    
Interest expense               160,755    
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]                    
Net sales percentage               50.00%    
Milestone payments               $ 5,900,000    
Paying an extension fee           $ 10,000,000   10,000,000    
LYMPHIR [Member]                    
Patent and Technology License Agreements [Line Items]                    
Milestone payments               27,500,000    
FDA [Member]                    
Patent and Technology License Agreements [Line Items]                    
Milestone payments       $ 33,400,000            
Subsequent Event [Member]                    
Patent and Technology License Agreements [Line Items]                    
Revenue percentage   2.00%                
Milestone payments   $ 2,197,892                
Paid amount   2,350,000                
Accumulated interest                   $ 1,616,521.96
Subsequent Event [Member] | License Agreement [Member]                    
Patent and Technology License Agreements [Line Items]                    
Upfront payment   1,091,167.12                
Subsequent Event [Member] | License Agreement with Eisai [Member]                    
Patent and Technology License Agreements [Line Items]                    
Development milestone payments   $ 2,535,318                
Subsequent Event [Member] | Citius Pharma [Member]                    
Patent and Technology License Agreements [Line Items]                    
Milestone payments     $ 1,000,000              
Subsequent Event [Member] | Citius Oncology [Member]                    
Patent and Technology License Agreements [Line Items]                    
Milestone payments $ 1,250,000                  
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 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 Eterna [Member]                    
Patent and Technology License Agreements [Line Items]                    
Royalty rate, percentage               8.00%    
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%