v3.26.3
Document And Entity Information
Sep. 21, 2026
Document Information [Line Items]  
Entity, Registrant Name STONEBRIDGE ACQUISITION II CORPORATION
Document, Type 8-K
Document, Period End Date Sep. 21, 2026
Entity, Incorporation, State or Country Code E9
Entity, File Number 001-42871
Entity, Address, Address Line One One World Trade Center
Entity, Address, Address Line Two Suite 8500
Entity, Address, City or Town New York
Entity, Address, State or Province NY
Entity, Address, Postal Zip Code 10007
City Area Code 646
Local Phone Number 314-3555
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity, Emerging Growth Company true
Entity, Ex Transition Period false
Amendment Flag false
Entity, Central Index Key 0002043630
UnitsEachConsistingOfOneClassAOrdinaryShareParValue00001PerShareAndOneRightToAcquireOnetenthOfOneClassAOrdinaryShare Custom [Member]  
Document Information [Line Items]  
Title of 12(b) Security Units, each consisting of one Class A Ordinary Share, par value $0.0001 per share, and one Right to acquire one-tenth of one Class A Ordinary Share
Trading Symbol APACU
Security Exchange Name NASDAQ
ClassAOrdinarySharesParValue00001PerShare Custom [Member]  
Document Information [Line Items]  
Title of 12(b) Security Class A Ordinary Shares, par value $0.0001 per share
Trading Symbol APAC
Security Exchange Name NASDAQ
RightsEachRightToAcquireOnetenthOfOneClassAOrdinaryShare Custom [Member]  
Document Information [Line Items]  
Title of 12(b) Security Rights, each Right to acquire one-tenth of one Class A Ordinary Share
Trading Symbol APACR
Security Exchange Name NASDAQ