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SHAREHOLDERS' EQUITY - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Rollforward of accumulated other comprehensive income (loss), net of tax    
Beginning balance $ 2,771,943 $ 2,765,472
Other comprehensive income 134 256
Ending balance 2,759,646 $ 2,745,145
Unrealized pension actuarial loss    
Rollforward of accumulated other comprehensive income (loss), net of tax    
Beginning balance (7,981)  
Amounts reclassified from accumulated other comprehensive loss 134  
Other comprehensive income 134  
Ending balance $ (7,847)