v3.26.1
Earnings per Share - Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Accounting Policies [Abstract]    
Net (loss) income attributable to Great Elm Group, Inc. stockholders $ (35,444) $ 12,891
Effect of dilutive securities:    
Interest expense associated with Convertible Notes 0 1,926
Numerator for diluted EPS - Net (loss) income attributable to Great Elm Group, Inc. stockholders after the effect of dilutive securities $ (35,444) $ 14,817
Denominator:    
Denominator for basic EPS - Weighted average shares of common stock outstanding 30,289 27,642
Effect of dilutive securities:    
Restricted stock 0 1,077
Convertible Notes 0 10,098
Denominator for diluted EPS - Weighted average shares of common stock outstanding after the effect of dilutive securities 30,289 38,817
Net loss attributable to stockholders per share    
Basic $ (1.17) $ 0.47
Diluted $ (1.17) $ 0.38