| Document and Entity Information | Feb. 23, 2023 |
| Document Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001884697 |
| Document Type | 8-K |
| Document Period End Date | Feb. 23, 2023 |
| Entity Registrant Name | STARRY GROUP HOLDINGS, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-41336 |
| 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 |
| 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 |
