EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net (loss) income	$ (11,574)	$ 120,812	$ 89,411	$ 1,532	$ 110,247	$ 115,921	$ 198,649	$ 227,700
Basic (loss) earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	98,983,000			97,168,000			98,409,000	96,849,000
Basic (loss) earnings per common share (usd per share)	$ (0.12)			$ 0.02			$ 2.02	$ 2.35
Diluted (loss) earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	98,983,000			97,168,000			98,409,000	96,849,000
Incremental shares (in shares)	0			718,000			804,000	689,000
Weighted average shares of common stock outstanding-diluted (in shares)	98,983,000			97,886,000			99,213,000	97,538,000
Diluted (loss) earnings per common share (usd per share)	$ (0.12)			$ 0.02			$ 2.00	$ 2.33
Anti-dilutive shares excluded from the calculation of diluted earnings per share (in shares)	834,131			0			0	0