Non-Controlling Interests and Preferred Stock of Subsidiaries - Summary of Non-controlling Interests Balance on Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Net income (loss)
Total net (loss) income attributable to non-controlling interest	$ (248)	$ 306
Great Elm Healthcare, LLC (HC LLC)
Net income (loss)
Temporary equity	662	205
Permanent equity	662	205
Total net (loss) income attributable to non-controlling interest	1,324	410
GEC GP
Net income (loss)
Permanent equity		(2)
Consolidated Fund
Net income (loss)
Permanent equity	(8)	(85)
Forest
Net income (loss)
Permanent equity	$ (1,564)	$ (17)