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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, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance $ 4,012,223 $ 4,382,735
Other comprehensive income 516 225
Balance 3,975,537 $ 4,326,238
Defined Benefit Pension Plan    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (28,635)  
Amounts reclassified from accumulated other comprehensive loss 516  
Other comprehensive income 516  
Balance $ (28,119)