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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 9 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Balance $ 3,461,006 $ 3,975,537 $ 4,012,223 $ 4,318,620 $ 4,326,238 $ 4,382,735 $ 4,012,223 $ 4,382,735
Other comprehensive income 521 516 516 226 224 225 1,553 675
Balance 3,396,057 3,461,006 3,975,537 $ 4,095,054 $ 4,318,620 $ 4,326,238 3,396,057 $ 4,095,054
Defined Benefit Pension Plan                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Balance (27,603)   $ (28,635)       (28,635)  
Amounts reclassified from accumulated other comprehensive loss 521           1,553  
Other comprehensive income 521           1,553  
Balance $ (27,082) $ (27,603)         $ (27,082)