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SHAREHOLDERS' EQUITY - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Mar. 31, 2023
Rollforward of accumulated other comprehensive income (loss), net of tax            
Beginning balance $ 2,759,646 $ 2,771,943 $ 2,745,145 $ 2,765,472 $ 2,771,943 $ 2,765,472
Net current-period other comprehensive income 134 134 256 256 268 512
Ending balance 2,803,074 2,759,646 $ 2,755,806 $ 2,745,145 2,803,074 $ 2,755,806
Unrealized pension actuarial loss            
Rollforward of accumulated other comprehensive income (loss), net of tax            
Beginning balance (7,847) (7,981)     (7,981)  
Net current-period other comprehensive income 134       268  
Ending balance $ (7,713) $ (7,847)     $ (7,713)