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Common Stock, Stock Options and Warrants (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 14, 2024
Jan. 17, 2024
Oct. 10, 2023
Nov. 08, 2022
Oct. 04, 2022
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Apr. 29, 2023
Common Stock, Stock Options and Warrants [Line Items]                      
Shares of common stock issued   128,205 108,778                
Fair value of common stock issued (in Dollars)   $ 98,079 $ 76,146                
Common shares reserved           75,396,675   75,396,675      
Options to purchase shares expired               348,343      
Contractual term               10 years      
Options granted to purchase shares 75,000                    
Share price per value (in Dollars per share)         $ 1.25            
Estimated price per share (in Dollars per share) $ 0.69             $ 0.53      
Stock-based compensation expense (in Dollars)           $ 3,078,392 $ 1,165,595 $ 6,136,577 $ 2,366,676    
Unrecognized compensation cost (in Dollars)               $ 4,835,255      
Weighted average period term               1 year 3 months 21 days      
Weighted average exercise price per share (in Dollars per share)               $ 0.7      
Shares exercisable           9,123,494   9,123,494      
Term of options outstanding               7 years 4 months 28 days      
Warrants outstanding (in Dollars)           $ 363,129   $ 363,129      
2014 Stock Incentive Plan [Member]                      
Common Stock, Stock Options and Warrants [Line Items]                      
Common shares reserved           866,667   866,667      
Shares outstanding           736,828   736,828      
Warrants to purchase common shares           4,829   4,829      
Options to purchase shares expired               125,010      
2018 Omnibus Stock Incentive Plan [Member]                      
Common Stock, Stock Options and Warrants [Line Items]                      
Common shares reserved           2,000,000   2,000,000      
Shares outstanding           1,720,000   1,720,000      
Warrants to purchase common shares           116,667   116,667      
Options to purchase shares expired               53,333      
Remaining shares transferred           110,000   110,000      
2020 Plan [Member]                      
Common Stock, Stock Options and Warrants [Line Items]                      
Common shares reserved           3,110,000   3,110,000      
Shares outstanding           1,735,000   1,735,000      
Options to purchase shares expired               135,000      
Remaining shares transferred           1,240,000   1,240,000      
2021 Stock Plan [Member]                      
Common Stock, Stock Options and Warrants [Line Items]                      
Common shares reserved           8,740,000   8,740,000      
Shares outstanding           8,465,000   8,465,000      
Warrants to purchase common shares           240,000   240,000      
Remaining shares transferred           35,000   35,000      
Shares available for future grants               7,575,000      
2023 Stock Plan [Member]                      
Common Stock, Stock Options and Warrants [Line Items]                      
Common shares reserved           12,035,000   12,035,000      
Shares outstanding           4,460,000   4,460,000      
Stock Option [Member]                      
Common Stock, Stock Options and Warrants [Line Items]                      
Estimated price per share (in Dollars per share)               $ 0.97      
NoveCite Plan [Member]                      
Common Stock, Stock Options and Warrants [Line Items]                      
Common shares reserved           2,000,000   2,000,000      
Shares available for future grants               88,500      
Options granted to purchase shares               1,911,500      
Stock-based compensation expense (in Dollars)           $ 13,858 $ 33,333 $ 33,716 $ 66,666    
Unrecognized compensation cost (in Dollars)               $ 13,858      
Options outstanding to purchase shares               1,911,500      
Weighted average exercise price per share (in Dollars per share)               $ 0.24      
Shares exercisable           1,772,917   1,772,917      
Options vest over terms               10 years      
Term of options outstanding               6 years 10 months 20 days      
Weighted average period               3 months      
Citius Oncology Plan [Member]                      
Common Stock, Stock Options and Warrants [Line Items]                      
Common shares reserved                     15,000,000
Options granted to purchase shares                   12,750,000  
Estimated price per share (in Dollars per share)                   $ 1.65  
Stock-based compensation expense (in Dollars)           $ 1,957,000   $ 3,874,000      
Unrecognized compensation cost (in Dollars)               $ 14,968,500      
Options outstanding to purchase shares               12,600,000      
Shares exercisable           2,622,222   2,622,222      
Options vest over terms                   10 years  
Term of options outstanding               9 years 3 months 7 days      
Weighted average period               2 years 2 months 12 days      
Exercise price per share (in Dollars per share)                   $ 2.15  
Common shares forfeited                   150,000  
Warrants [Member]                      
Common Stock, Stock Options and Warrants [Line Items]                      
Weighted average period               2 years 2 months 12 days      
Employees [Member]                      
Common Stock, Stock Options and Warrants [Line Items]                      
Options granted to purchase shares     3,725,000   3,375,000            
Directors [Member]                      
Common Stock, Stock Options and Warrants [Line Items]                      
Options granted to purchase shares     300,000   375,000            
Consultants [Member]                      
Common Stock, Stock Options and Warrants [Line Items]                      
Options granted to purchase shares     60,000 50,000 50,000            
Share price per value (in Dollars per share)       $ 1.04              
Board of Directors [Member]                      
Common Stock, Stock Options and Warrants [Line Items]                      
Share price per value (in Dollars per share)     $ 0.7