Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2023	Nov. 21, 2023
Document Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-40251
Entity Registrant Name	NEWBURY STREET ACQUISITION CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	85-3985188
Entity Address, Address Line One	121 High Street, 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	893-3057
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Entity Common Stock, Shares Outstanding		5,857,433
Entity Central Index Key	0001831978
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false
Units, each consisting of one share of Common Stock and one-half of one Redeemable Warrant
Document Entity Information
Title of 12(b) Security	Units, each consisting of one share of Common Stock and one-half of one Redeemable Warrant
Trading Symbol	NBSTU
Security Exchange Name	NASDAQ
Common Stock
Document Entity Information
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	NBST
Security Exchange Name	NASDAQ
Redeemable Warrants, each whole warrant exercisable for one share of Common Stock
Document Entity Information
Title of 12(b) Security	Redeemable Warrants, each whole warrant exercisable for one share of Common Stock for $11.50 per share
Trading Symbol	NBSTW
Security Exchange Name	NASDAQ