SHAREHOLDERS' EQUITY - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Rollforward of accumulated other comprehensive income (loss), net of tax
Beginning balance	$ 2,765,472	$ 2,912,618
Other comprehensive income	256	394
Ending balance	2,745,145	$ 2,776,591
Defined Benefit Pension Plan
Rollforward of accumulated other comprehensive income (loss), net of tax
Beginning balance	(12,072)
Amounts reclassified from accumulated other comprehensive loss	256
Other comprehensive income	256
Ending balance	$ (11,816)