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SHAREHOLDERS' EQUITY - Summary of the Changes in Accumulated Other Comprehensive Loss, Net of Tax, by Component (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 2,912,618 $ 3,318,514
Other comprehensive income 394 457
Ending balance 2,776,591 $ 3,224,918
Defined Benefit Pension Plan    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (20,244)  
Amounts reclassified from accumulated other comprehensive loss 394  
Other comprehensive income 394  
Ending balance $ (19,850)