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SHAREHOLDERS' EQUITY - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Rollforward of accumulated other comprehensive income (loss), net of tax      
Beginning balance $ 2,765,472 $ 2,912,618 $ 3,318,514
Other comprehensive income 4,091 8,172 5,944
Ending balance 2,771,943 2,765,472 $ 2,912,618
Unrealized actuarial loss      
Rollforward of accumulated other comprehensive income (loss), net of tax      
Beginning balance (12,072)    
Amounts reclassified from accumulated other comprehensive loss 4,091    
Other comprehensive income 4,091    
Ending balance $ (7,981) $ (12,072)