EARNINGS (LOSSES) PER COMMON SHARE - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Income (loss) from continuing operations	$ 95,280			$ 17,475			$ 355,608	$ (38,480)
Income (loss) from discontinued operations	13			277			870	(106)
NET INCOME (LOSS)	95,293	$ 164,040	$ 97,145	17,752	$ (4,976)	$ (51,362)	356,478	(38,586)
Adjustment for basic earnings (loss) per share
Earnings allocated to unvested shareholders	(1,283)			(368)			(4,810)	(1,138)
Numerator for basic earnings (loss) per share:
From continuing operations	93,997			17,107			350,798	(39,618)
From discontinued operations	13			277			870	(106)
Net income (loss) attributable to parent, basic	94,010			17,384			351,668	(39,724)
Effect of reallocating undistributed earnings of unvested shareholders	2			0			9	0
Numerator for diluted earnings (loss) per share:
From continuing operations	93,999			17,107			350,807	(39,618)
From discontinued operations	13			277			870	(106)
Net income (loss) attributable to parent, diluted	$ 94,012			$ 17,384			$ 351,677	$ (39,724)
Denominator:
Denominator for basic earnings (loss) per share - weighted-average shares (in shares)	101,163			105,289			103,464	106,092
Effect of dilutive shares from stock options, restricted stock and performance share units (in shares)	387			732			388	0
Denominator for diluted earnings (loss) per share - adjusted weighted-average shares (in shares)	101,550			106,021			103,852	106,092
Basic earnings (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	$ 0.93			$ 0.16			$ 3.39	$ (0.37)
Income from discontinued operations (in dollars per share)	0			0			0.01	0
Net income (loss) (in dollars per share)	0.93			0.16			3.40	(0.37)
Diluted earnings (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	0.93			0.16			3.38	(0.37)
Income from discontinued operations (in dollars per share)	0			0			0.01	0
Net income (loss) (in dollars per share)	$ 0.93			$ 0.16			$ 3.39	$ (0.37)