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OTHER INCOME (EXPENSE), NET - Schedule of Other Income (Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2024
Other Income and Expenses [Abstract] |  |  |
Foreign exchange gains (losses) | $ 3,228 | $ (24,888) | $ 1,202
Unrealized gains (losses) on derivatives not designated as hedges | 27,369 | (44,286) | 3,116
Realized losses on derivatives not designated as hedges | 0 | (10,380) | 0
OpenText share in net income (loss) of equity investees | (4,049) | 230 | (18,194)
Loss on extinguishment of debt | 18,787 | 0 | 56,393
Gain (adjustments to gain) on divestitures | 76,136 | (4,175) | 429,102
Other miscellaneous income (expense) | 1,978 | 712 | (442)
Total other income (expense), net | $ 85,875 | $ (82,787) | $ 358,391

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