Quarterly Financial Results (Unaudited) - Summary of Quarterly Financial Results (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Quarterly Financial Information Disclosure [Abstract]
Net revenues	$ 67,974	$ 60,853
Operating costs and expenses	72,081	64,590
Operating loss	(4,107)	(3,737)
Income (loss) from continuing operations	(15,037)	(8,519)	[1]
Income (loss) from discontinued operations		649
Net income (loss) attributable to Great Elm Group, Inc.	$ (14,893)	$ (7,275)	[1]
Basic income (loss) from continuing operations per share	$ (0.56)	$ (0.31)
Basic income (loss) from discontinued operations per share		0.03
Net loss per share, basic	(0.56)	(0.28)	[1]
Diluted income (loss) from continuing operations per share	(0.56)	(0.31)
Diluted income (loss) from discontinued operations per share		0.03
Net loss per share, diluted	$ (0.56)	$ (0.28)	[1]
Shares used in computing:
Basic income (loss) per share	26,784	25,722
Diluted income (loss) per share	26,784	25,722

[1] The As Reported column refects amounts originally reported in our Form 10-K filed on September 21, 2021. The As Adjusted column reflects recast amounts reported in our Form 8-K filed on May 5, 2022.