| Document and Entity Information | May 28, 2024 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001915380 |
| Document Type | 8-K |
| Document Period End Date | May 28, 2024 |
| Entity Registrant Name | dMY Squared Technology Group, Inc. |
| Entity Incorporation State Country Code | MA |
| Entity File Number | 001-41519 |
| Entity Tax Identification Number | 88-0748933 |
| Entity Address, Address Line One | 1180 North Town Center Drive |
| Entity Address, Address Line Two | Suite 100 |
| Entity Address, City or Town | Las Vegas |
| Entity Address, State or Province | NV |
| Entity Address, Postal Zip Code | 89144 |
| City Area Code | (702) |
| Local Phone Number | 781-4313 |
| 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 |
| Units Each Consisting Of One Share Of Class A Common Stock And One Half Of One Redeemable Warrant [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Units, each consisting of one share of Class A common stock and one-half of one redeemable warrant |
| Trading Symbol | DMYY.U |
| Security Exchange Name | NYSEAMER |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class A common stock, par value $0.0001 per share |
| Trading Symbol | DMYY |
| Security Exchange Name | NYSEAMER |
| Redeemable Warrants Each Whole Warrant Exercisable For One Share Of Class A Common Stock Each At An Exercise Price Of 11.50 Per Share [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Redeemable warrants, each whole warrant exercisable for one share of Class A common stock, each at an exercise price of $11.50 per share |
| Trading Symbol | DMYY.WS |
| Security Exchange Name | NYSEAMER |
