v3.25.2
Cover - USD ($)
 12 Months Ended
Sep. 30, 2024
Jul. 11, 2025
Document Information [Line Items]    
Document Type 10-K  
Document Annual Report true  
Document Transition Report false  
Document Financial Statement Error Correction [Flag] false  
Entity Interactive Data Current Yes  
ICFR Auditor Attestation Flag false  
Amendment Flag false  
Document Period End Date Sep. 30, 2024  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus FY  
Documents Incorporated by Reference [Text Block] None  
Entity Information [Line Items]    
Entity Registrant Name GRAPHJET TECHNOLOGY  
Entity Central Index Key 0001879373  
Entity File Number 001-41070  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code E9  
Current Fiscal Year End Date --09-30  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
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 Public Float   $ 4,157,775.86
Entity Contact Personnel [Line Items]    
Entity Address, Address Line One Lot 3895  
Entity Address, Address Line Two Lorong 6D, Kampung Baru Subang Seksyen U6  
Entity Address, City or Town Shah Alam Selangor  
Entity Address, Country MY  
Entity Address, Postal Zip Code 40150  
Entity Phone Fax Numbers [Line Items]    
City Area Code +60  
Local Phone Number 016 310 0895  
Entity Listings [Line Items]    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol GTI  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   148,037,022