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SHAREHOLDERS' EQUITY - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
USD ($)
Rollforward of accumulated other comprehensive income (loss), net of tax  
Other comprehensive income before reclassifications $ 40,882
Amounts reclassified from accumulated other comprehensive income 10,432
Net current-period other comprehensive income 51,314
Accumulated Other Comprehensive Income (Loss)  
Rollforward of accumulated other comprehensive income (loss), net of tax  
Beginning balance (6,350)
Ending balance 44,964
Unrealized Loss on Available-for-Sale Securities  
Rollforward of accumulated other comprehensive income (loss), net of tax  
Beginning balance (512)
Other comprehensive income before reclassifications 684
Amounts reclassified from accumulated other comprehensive income 124
Net current-period other comprehensive income 808
Ending balance 296
Unrealized pension actuarial gain (loss) on defined benefit pension plans  
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 income 10,308
Net current-period other comprehensive income 10,308
Ending balance 4,470
Foreign Currency Translation Adjustment  
Rollforward of accumulated other comprehensive income (loss), net of tax  
Beginning balance 0
Other comprehensive income before reclassifications 40,198
Amounts reclassified from accumulated other comprehensive income 0
Net current-period other comprehensive income 40,198
Ending balance $ 40,198