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SHAREHOLDERS' EQUITY - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Rollforward of accumulated other comprehensive income (loss), net of tax      
Balance $ 3,318,514 $ 4,012,223 $ 4,382,735
Other comprehensive income (loss) 5,944 2,447 (11,875)
Balance 2,912,618 3,318,514 $ 4,012,223
Defined Benefit Pension Plan      
Rollforward of accumulated other comprehensive income (loss), net of tax      
Balance (26,188)    
Amounts reclassified from accumulated other comprehensive loss 5,944    
Other comprehensive income (loss) 5,944    
Balance $ (20,244) $ (26,188)