Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2022	May 13, 2022
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-41336
Entity Registrant Name	STARRY GROUP HOLDINGS, INC.
Entity Central Index Key	0001884697
Current Fiscal Year End Date	--12-31
Document Period End Date	Mar. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	87-4759355
Entity Address, Address Line One	38 Chauncy Street
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02111
City Area Code	617
Local Phone Number	861-8300
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	false
Class A Common Stock
Entity Information [Line Items]
Trading Symbol	STRY
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		157,327,443
Class X Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		9,268,335
Warrant
Entity Information [Line Items]
Trading Symbol	STRY WS
Title of 12(b) Security	Warrants to purchase 1.2415 shares of Class A common stock, each at an exercise price of $9.13 per 1.2415 shares of Class A common stock
Security Exchange Name	NYSE