EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 264,724	$ 274,922	$ 117,890
Basic earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	97,028	96,100	96,227
Basic earnings per common share (usd per share)	$ 2.73	$ 2.86	$ 1.23
Diluted earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	97,028	96,100	96,227
Incremental shares (in shares)	599	388	333
Weighted average shares of common stock outstanding-diluted (in shares)	97,627	96,488	96,560
Diluted earnings per common share (usd per share)	$ 2.71	$ 2.85	$ 1.22