v3.26.1
Cover
 12 Months Ended
Mar. 31, 2026
shares
Entity Addresses [Line Items]  
Document Type 20-F
Amendment Flag false
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Period End Date Mar. 31, 2026
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2026
Current Fiscal Year End Date --03-31
Entity File Number 001-43046
Entity Registrant Name Green Circle Decarbonize Technology Limited
Entity Central Index Key 0001926293
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One Unit 1809
Entity Address, Address Line Two Prosperity Place
Entity Address, Address Line Three 6 Shing Yip St.
Entity Address, City or Town Kwun Tong
Entity Address, Country HK
Entity Address, Postal Zip Code 0000
Title of 12(b) Security Ordinary shares, par value US$0.001 per share
Trading Symbol GCDT
Security Exchange Name NYSEAMER
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Common Stock, Shares Outstanding 12,875,000
ICFR Auditor Attestation Flag false
Document Financial Statement Error Correction [Flag] false
Auditor Firm ID 6413
Auditor Opinion [Text Block] We have audited the accompanying consolidated statements of financial position of Green Circle Decarbonize Technology Limited (the “Company”) as of March 31, 2026, and the related consolidated statements of loss and comprehensive loss, changes in shareholders’ equity, and cash flows for each of the years in the three-year period ended March 31, 2026, and the related notes (collectively referred to as the consolidated financial statements). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of March 31, 2026, and the results of its operations and its cash flows for each of the years in the three-year period ended March 31, 2026 in conformity with International Financial Reporting Standards as issued by the International Accounting Standards Board.
Auditor Name ZH CPA, LLC
Auditor Location Denver, Colorado
Business Contact [Member]  
Entity Addresses [Line Items]  
Entity Address, Address Line One Unit 1809
Entity Address, Address Line Two Prosperity Place
Entity Address, Address Line Three 6 Shing Yip St.
Entity Address, City or Town Kwun Tong
Entity Address, Country HK
Entity Address, Postal Zip Code 0000
City Area Code +852
Local Phone Number 2882 1222
Contact Personnel Name Chan Kam Biu Richard