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Forest Note and Transactions with JPM - Schedule of Loss Before Income Taxes of Forest As well As Loss Before Income Taxes of Forest Attributable to Great Elm Group, Inc (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Note And Transactions [Line Items]
Loss before income taxes	$ (891)	$ (312)	$ (2,679)	$ (960)
Loss before income taxes attributable to Great Elm Group, Inc.	$ (909)	$ (151)	$ (1,133)	$ (782)

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Note And Transactions [Line Items]

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Amount, before tax, of income (loss) attributable to parent. Includes, but is not limited to, income (loss) from continuing operations, discontinued operations and equity method investments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.20)
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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-Publisher FASB
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-Topic 220
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Amount, before tax, of income (loss) including portion attributable to noncontrolling interest. Includes, but is not limited to, income (loss) from continuing operations, discontinued operations and equity method investments.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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