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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation - Prior Years (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2024
Income Tax Disclosure [Abstract] |  |  |
Canadian Federal tax | 15.00% | 26.50% | 26.50%
Canadian Federal tax | $ 128,832 | $ 127,749 | $ 193,263
Effect of foreign tax rate differences |  | (9,275) | (18,338)
Change in valuation allowance |  | (4,040) | 71,328
Effect of permanent differences |  | 24,908 | 11,864
Effect of changes in unrecognized tax benefits |  | (32,387) | (4,570)
Effect of withholding taxes |  | 7,479 | 18,680
Effect of tax credits |  | (55,656) | (84,244)
Effect of accrual for undistributed earnings |  | 4,072 | (12,421)
Effect of U.S. BEAT |  | 0 | 17,927
Difference in tax filing positions from provision | 6,450 | (37,053) | (2,661)
Impact of internal reorganizations |  | 5,037 | 59,761
Other items | (23,430) | 15,171 | 13,423
Provision for income taxes | $ 215,614 | $ 46,005 | $ 264,012

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