Cover - USD ($)	12 Months Ended
	Dec. 31, 2025	Mar. 30, 2026
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Amendment Flag	false
Entity Registrant Name	Trailblazer Acquisition Corp.
Entity Central Index Key	0002075310
Document Period End Date	Dec. 31, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Entity File Number	001-42833
Entity Tax Identification Number	99-1868836
Entity Incorporation, State or Country Code	E9
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Address, Address Line One	152 West 57th Street
Entity Address, Address Line Two	27th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10019
City Area Code	(212)
Local Phone Number	621-8777
Entity Shell Company	true
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Public Float	$ 275,275,000
Class A Ordinary Shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		27,500,000
Class B Ordinary Shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		6,875,000
Units, each consisting of one Class A Ordinary Share and one-third of one Redeemable Warrant
Document Information [Line Items]
Title of 12(b) Security	Units, each consisting of one Class A Ordinary Share and one-third of one Redeemable Warrant
Trading Symbol	BLZRU
Security Exchange Name	NASDAQ
Class A Ordinary Shares, par value $0.0001 per share
Document Information [Line Items]
Title of 12(b) Security	Class A Ordinary Shares, par value $0.0001 per share
Trading Symbol	BLZR
Security Exchange Name	NASDAQ
Redeemable Warrants, each whole Redeemable Warrant exercisable for one Class A Ordinary Share at an exercise price of $11.50 per share
Document Information [Line Items]
Title of 12(b) Security	Redeemable Warrants, each whole Redeemable Warrant exercisable for one Class A Ordinary Share at an exercise price of $11.50 per share
Trading Symbol	BLZRW
Security Exchange Name	NASDAQ