v3.26.1
Cover
Aug. 17, 2026
Document Type 8-K
Amendment Flag false
Document Period End Date Aug. 17, 2026
Entity File Number 001-42391
Entity Registrant Name NEWBURY STREET II ACQUISITION CORP
Entity Central Index Key 0002028027
Entity Tax Identification Number 98-1797287
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One 121 High Street
Entity Address, Address Line Two Floor 3
Entity Address, City or Town Boston
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02110
City Area Code 617
Local Phone Number 334-2805
Written Communications true
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant  
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant
Trading Symbol NTWOU
Security Exchange Name NASDAQ
Class A ordinary shares, par value $0.0001 per share  
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share
Trading Symbol NTWO
Security Exchange Name NASDAQ
Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share  
Title of 12(b) Security Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share
Trading Symbol NTWOW
Security Exchange Name NASDAQ