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SHAREHOLDERS' EQUITY - Summary of the Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax, by Component (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 3,318,514 $ 4,012,223
Other comprehensive income 457 516
Ending balance 3,224,918 $ 3,975,537
Defined Benefit Pension Plan    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (26,188)  
Amounts reclassified from accumulated other comprehensive income 457  
Other comprehensive income 457  
Ending balance $ (25,731)