EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income, as reported	$ 274,922	$ 117,890	$ 163,007
Basic earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	96,100,000	96,227,000	94,798,000
Basic earnings per common share (usd per share)	$ 2.86	$ 1.23	$ 1.72
Diluted earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	96,100,000	96,227,000	94,798,000
Incremental shares (in shares)	388,000	333,000	305,000
Weighted average shares of common stock outstanding-diluted (in shares)	96,488,000	96,560,000	95,103,000
Diluted earnings per common share (usd per share)	$ 2.85	$ 1.22	$ 1.71
Share-based Payment Arrangement
Diluted earnings per share
Anti-dilutive securities excluded from the calculation of diluted earnings per share (in shares)	0	0	74,000