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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