EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net income, as reported	$ 115,921	$ 111,312
Basic earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	96,485	95,944
Basic earnings per common share (usd per share)	$ 1.20	$ 1.16
Diluted earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	96,485	95,944
Incremental shares (in shares)	598	412
Weighted average shares of common stock outstanding-diluted (in shares)	97,083	96,356
Diluted earnings per common share (usd per share)	$ 1.19	$ 1.16