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SHAREHOLDERS' EQUITY - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) |  |  |
Pre-tax amounts: |  |  |
Unrealized pension actuarial loss on U.S. Plan | $ 8,283 |  | $ (8,294)
After-tax amounts: |  |  |
Unrealized pension actuarial loss on U.S. Plan | 9,501 | $ 1,064 | (6,350)
Unrealized pension actuarial loss on U.S. Plan |  |  |
Pre-tax amounts: |  |  |
Unrealized pension actuarial loss on U.S. Plan | (7,425) |  | (7,632)
After-tax amounts: |  |  |
Unrealized pension actuarial loss on U.S. Plan | (5,678) | (5,731) | (5,838)
Unrealized gain (loss) on available-for-sale debt securities |  |  |
Pre-tax amounts: |  |  |
Unrealized pension actuarial loss on U.S. Plan | 383 |  | (662)
After-tax amounts: |  |  |
Unrealized pension actuarial loss on U.S. Plan | 296 | 388 | (512)
Unrealized gain on foreign currency translation adjustment |  |  |
Pre-tax amounts: |  |  |
Unrealized pension actuarial loss on U.S. Plan | 15,325 |  | 0
After-tax amounts: |  |  |
Unrealized pension actuarial loss on U.S. Plan | $ 14,883 | $ 6,407 | $ 0

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