v3.25.2
Cover - shares
9 Months Ended
Jun. 30, 2025
Aug. 11, 2025
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2025  
Current Fiscal Year End Date --09-30  
Entity File Number 001-42044  
Entity Registrant Name NANO NUCLEAR ENERGY INC.  
Entity Central Index Key 0001923891  
Entity Tax Identification Number 88-0861977  
Entity Incorporation, State or Country Code NV  
Entity Address, Address Line One 10 Times Square  
Entity Address, Address Line Two 30th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10018  
City Area Code (212)  
Local Phone Number 634-9206  
Title of 12(b) Security Common stock, par value $0.0001 per share  
Trading Symbol NNE  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Elected Not To Use the Extended Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   41,580,673