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Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Accounting Policies [Abstract] |  |
Net (loss) income from continuing operations | $ 15,550 | $ (942)
Less: net income attributable to non-controlling interest, continuing operations | 2,659 | 462
Numerator for basic EPS - Net (loss) income from continuing operations attributable to Great Elm Group, Inc. | 12,891 | (1,404)
Net income from discontinued operations | 0 | 16
Numerator for basic EPS - Net income from discontinued operations, attributable to Great Elm Group, Inc. | 0 | 16
Effect of dilutive securities: |  |
Interest expense associated with Convertible Notes, continuing operations | 1,926 | 0
Numerator for diluted EPS - Net (loss) income from continuing operations attributable to Great Elm Group, Inc., after the effect of dilutive securities | 14,817 | (1,404)
Numerator for diluted EPS - Net income from discontinued operations, attributable to Great Elm Group, Inc. | $ 0 | $ 16
Denominator: |  |
Denominator for basic EPS - Weighted average shares of common stock outstanding | 27,642 | 29,962
Effect of dilutive securities: |  |
Restricted stock | 1,077 | 0
Convertible Notes | 10,098 | 0
Denominator for diluted EPS - Weighted average shares of common stock outstanding after the effect of dilutive securities | 38,817 | 29,962
Net (loss) income attributable to shareholders per share |  |
Basic net income per share | $ 0.47 | $ (0.05)
Diluted net income per share | $ 0.38 | $ (0.05)

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