EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income, as reported	$ 111,312	$ 81,045
Basic earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	95,944,000	96,114,000
Basic earnings per common share (usd per share)	$ 1.16	$ 0.84
Diluted earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	95,944,000	96,114,000
Incremental shares (in shares)	412,000	301,000
Weighted average shares of common stock outstanding-diluted (in shares)	96,356,000	96,415,000
Diluted earnings per common share (usd per share)	$ 1.16	$ 0.84
Share-based Payment Arrangement
Diluted earnings per share
Anti-dilutive shares excluded from the calculation of diluted earnings per share (in shares)		32,317