EARNINGS (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2022	Jun. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss), as reported	$ 13,053	$ 96,035	$ 111,312	$ (111,831)	$ 149,809	$ 81,045	$ 220,400	$ 119,023
Basic earnings (loss) per share
Weighted average shares of common stock outstanding-basic (in shares)	96,154,000			96,348,000			96,055,000	96,237,000
Basic earnings (loss) per common share (usd per share)	$ 0.14			$ (1.16)			$ 2.29	$ 1.24
Diluted earnings (loss) per share
Weighted average shares of common stock outstanding-basic (in shares)	96,154,000			96,348,000			96,055,000	96,237,000
Incremental shares (in shares)	466,000			0			472,000	392,000
Weighted average shares of common stock outstanding-diluted (in shares)	96,620,000			96,348,000			96,527,000	96,629,000
Diluted earnings (loss) per common share (usd per share)	$ 0.14			$ (1.16)			$ 2.28	$ 1.23
Share-based Payment Arrangement
Diluted earnings (loss) per share
Anti-dilutive shares excluded from the calculation of diluted earnings per share (in shares)	0			406,278			0	0