INCOME TAXES - Components of Income (Loss) from Continuing Operations and Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Components of income before income taxes:
United States	$ 1,174,109	$ 770,350	$ 201,784
Non-U.S	29,511	9,651	214
Income before income taxes	1,203,620	780,001	201,998
United States:
Federal	228,141	182,105	32,335
State	49,793	46,913	9,668
Non-U.S:	9,198	6,432	3,210
Current income tax expense	287,132	235,450	45,213
United States:
Federal	3,174	(35,442)	5,102
State	753	(7,281)	49
Non-U.S:	(873)	(583)	(668)
Deferred income (benefit) tax expense	3,054	(43,306)	4,483
Income tax expense	$ 290,186	$ 192,144	$ 49,696