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Earnings per Share - Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Accounting Policies [Abstract]        
Net loss attributable to Great Elm Group, Inc. stockholders $ (13,724) $ (4,497) $ (36,508) $ (682)
Effect of dilutive securities:        
Interest expense associated with Convertible Notes 0 0 0 0
Numerator for diluted EPS - Net loss attributable to Great Elm Group, Inc. stockholders after the effect of dilutive securities $ (13,724) $ (4,497) $ (36,508) $ (682)
Denominator:        
Denominator for basic EPS - Weighted average shares of common stock outstanding 30,763 26,915 30,451 28,000
Effect of dilutive securities:        
Restricted stock 0 0 0 0
Convertible Notes 0 0 0 0
Denominator for diluted EPS - Weighted average shares of common stock outstanding after the effect of dilutive securities 30,763 26,915 30,451 28,000
Net loss attributable to stockholders per share        
Basic $ (0.45) $ (0.17) $ (1.2) $ (0.02)
Diluted $ (0.45) $ (0.17) $ (1.2) $ (0.02)