v3.26.3
Cover Page
Sep. 25, 2026
Document Information [Line Items]  
Document Type S-1
Amendment Flag false
Entity Registrant Name TCGX Acquisition Corp. II
Entity Central Index Key 0002149916
Entity Primary SIC Number 6770
Entity Incorporation, State or Country Code KY
Entity Tax Identification Number 98-1949103
Entity Address, Address Line One 245 Lytton Ave.
Entity Address, Address Line Two Suite 350
Entity Address, City or Town Palo Alto
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94301
City Area Code 650
Local Phone Number 924-9424
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company true
Entity Ex Transition Period false
Business Contact [Member]  
Document Information [Line Items]  
Contact Personnel Name Dr. Chen Yu
Entity Address, Address Line One 245 Lytton Ave.
Entity Address, Address Line Two Suite 350
Entity Address, City or Town Palo Alto
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94301
City Area Code 650
Local Phone Number 924-9424