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SHAREHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss)      
Pre-tax amounts:      
Unrealized pension actuarial gain (loss) on defined benefit pension plans $ 49,401 $ (8,294) $ (10,407)
After-tax amounts:      
Unrealized pension actuarial gain (loss) on defined benefit pension plans 44,964 (6,350) (7,981)
Unrealized pension actuarial gain (loss) on defined benefit pension plans      
Pre-tax amounts:      
Unrealized pension actuarial gain (loss) on defined benefit pension plans 3,336 (7,632) (10,407)
After-tax amounts:      
Unrealized pension actuarial gain (loss) on defined benefit pension plans 4,470 (5,838) (7,981)
Unrealized Loss on Available-for-Sale Securities      
Pre-tax amounts:      
Unrealized pension actuarial gain (loss) on defined benefit pension plans 383 (662) 0
After-tax amounts:      
Unrealized pension actuarial gain (loss) on defined benefit pension plans 296 (512) 0
Unrealized gain on foreign currency translation adjustment      
Pre-tax amounts:      
Unrealized pension actuarial gain (loss) on defined benefit pension plans 45,682 0 0
After-tax amounts:      
Unrealized pension actuarial gain (loss) on defined benefit pension plans $ 40,198 $ 0 $ 0