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Summary of Significant Accounting Policies (Details)
 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Summary of Significant Accounting Policies [Line Items]    
Prepaid insurance $ 64,210 $ 0
Advance payments 1,331,280 2,700,000
Prepaid manufacturing costs 1,368,720 $ 6,134,895
In-process research and development $ 19,400,000  
Amortized straight line basis over period 8 years  
CODM, individual title and position or group name Chief Executive Officer  
Description of CODM The CODM evaluates the performance of the operating segment and allocates resources based on amounts as reported on the consolidated statements of operations and cash flows. Segment expenses are presented on the Company’s consolidated statements of operations.  
Reportable segment 1  
Citius Oncology’s [Member]    
Summary of Significant Accounting Policies [Line Items]    
Research and development $ 73,400,000  
Non-Hodgkin Lymphoma [Member]    
Summary of Significant Accounting Policies [Line Items]    
Amortized straight line basis over period 12 years  
Dr. Reddy’s [Member]    
Summary of Significant Accounting Policies [Line Items]    
Research and development $ 40,000,000  
Milestone fees 27,500,000  
Eisai [Member]    
Summary of Significant Accounting Policies [Line Items]    
Milestone fees $ 5,900,000