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				6 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Income (loss) from continuing operations	$ 163,901		$ (4,624)		$ 260,328	$ (55,955)
Income (loss) from discontinued operations	139		(352)		857	(383)
NET INCOME (LOSS)	164,040	$ 97,145	(4,976)	$ (51,362)	261,185	(56,338)
Adjustment for basic earnings (loss) per share
Earnings allocated to unvested shareholders	(2,237)		(396)		(3,511)	(770)
Numerator for basic earnings (loss) per share:
From continuing operations	161,664		(5,020)		256,817	(56,725)
From discontinued operations	139		(352)		857	(383)
Net income (loss) attributable to parent, basic	161,803		(5,372)		257,674	(57,108)
Effect of reallocating undistributed earnings of unvested shareholders	6		0		6	0
Numerator for diluted earnings (loss) per share:
From continuing operations	161,670		(5,020)		256,823	(56,725)
From discontinued operations	139		(352)		857	(383)
Net income (loss) attributable to parent, diluted	$ 161,809		$ (5,372)		$ 257,680	$ (57,108)
Denominator:
Denominator for basic earnings (loss) per share - weighted-average shares (in shares)	103,968		105,393		104,615	106,494
Effect of dilutive shares from stock options, restricted stock and performance share units (in shares)	395		0		388	0
Denominator for diluted earnings (loss) per share - adjusted weighted-average shares (in shares)	104,363		105,393		105,003	106,494
Basic earnings (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	$ 1.55		$ (0.05)		$ 2.45	$ (0.53)
Income from discontinued operations (in dollars per share)	0		0		0.01	0
Net income (loss) (in dollars per share)	1.55		(0.05)		2.46	(0.53)
Diluted earnings (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	1.55		(0.05)		2.45	(0.53)
Income from discontinued operations (in dollars per share)	0		0		0.01	0
Net income (loss) (in dollars per share)	$ 1.55		$ (0.05)		$ 2.46	$ (0.53)