v3.25.1
Cover - shares
 3 Months Ended
Mar. 31, 2025
May 13, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Mar. 31, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q1  
Entity Information [Line Items]    
Entity Registrant Name ESTRELLA IMMUNOPHARMA, INC.  
Entity Central Index Key 0001844417  
Entity File Number 001-40608  
Entity Tax Identification Number 86-1314502  
Entity Incorporation, State or Country Code DE  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Incorporation, Date of Incorporation Mar. 30, 2022  
Entity Contact Personnel [Line Items]    
Entity Address, Address Line One 5858 Horton Street  
Entity Address, Address Line Two Suite 370  
Entity Address, City or Town Emeryville  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 95608  
Entity Phone Fax Numbers [Line Items]    
City Area Code (510)  
Local Phone Number 318-9098  
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   36,165,589
Common Stock, par value $0.0001 per share    
Entity Listings [Line Items]    
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Trading Symbol ESLA  
Security Exchange Name NASDAQ  
Warrants, each whole warrant exercisable for one share of Common Stock at an exercise price of $11.50    
Entity Listings [Line Items]    
Title of 12(b) Security Warrants, each whole warrant exercisable for one share of Common Stock at an exercise price of $11.50  
Trading Symbol ESLAW  
Security Exchange Name NASDAQ