Non-Controlling Interests and Redeemable Preferred Stock of Subsidiaries - Summary of Non-controlling Interests Balance on Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jan. 03, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021
Balance as of
Temporary equity	$ 2,977	$ 2,977	$ 2,887	$ 2,225	$ 2,262	$ 2,948	$ 2,844	$ 2,639
Total Non-controlling interests				8,758
Great Elm Healthcare, LLC (HC LLC)
Balance as of
Temporary equity				2,225
Permanent equity				2,225
Total				4,450
Consolidated Fund
Balance as of
Permanent equity				642
Forest
Balance as of
Permanent equity				$ 3,666