| Cover | 12 Months Ended |
| Jun. 30, 2024 | |
| Document Information [Line Items] | |
| Document Type | DEFR14A |
| Amendment Flag | false |
| Entity Information [Line Items] | |
| Entity Registrant Name | GREAT ELM GROUP, INC. |
| Entity Central Index Key | 0001831096 |
| Insider Trading Policies and Procedures | 12 Months Ended |
| Jun. 30, 2024 | |
| Insider Trading Policies and Procedures [Line Items] | |
| Insider Trading Policies and Procedures Adopted | true |
