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SHAREHOLDERS' EQUITY - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
USD ($)
Rollforward of accumulated other comprehensive income (loss), net of tax  
Beginning balance $ 2,917,152
Other comprehensive income before reclassifications 309
Amounts reclassified from accumulated other comprehensive loss 54
Net current-period other comprehensive income 363
Ending balance 2,946,781
Accumulated Other Comprehensive Income (Loss)  
Rollforward of accumulated other comprehensive income (loss), net of tax  
Beginning balance (6,350)
Ending balance (5,987)
Unrealized pension actuarial loss  
Rollforward of accumulated other comprehensive income (loss), net of tax  
Beginning balance (5,838)
Other comprehensive income before reclassifications 0
Amounts reclassified from accumulated other comprehensive loss 54
Net current-period other comprehensive income 54
Ending balance (5,784)
Unrealized loss on available-for-sale debt security  
Rollforward of accumulated other comprehensive income (loss), net of tax  
Beginning balance (512)
Other comprehensive income before reclassifications 309
Amounts reclassified from accumulated other comprehensive loss 0
Net current-period other comprehensive income 309
Ending balance $ (203)