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, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Loss from continuing operations	$ (4,624)		$ (123,296)		$ (55,955)	$ (201,220)
Income (loss) from discontinued operations	(352)		2,293		(383)	9,786
NET LOSS	(4,976)	$ (51,362)	(121,003)	$ (70,431)	(56,338)	(191,434)
Adjustment for basic earnings (loss) per share
Earnings allocated to unvested shareholders	(396)		(354)		(770)	(714)
Numerator for basic earnings (loss) per share:
From continuing operations	(5,020)		(123,650)		(56,725)	(201,934)
From discontinued operations	(352)		2,293		(383)	9,786
Net income (loss) attributable to parent, basic	(5,372)		(121,357)		(57,108)	(192,148)
Numerator for diluted earnings (loss) per share:
From continuing operations	(5,020)		(123,650)		(56,725)	(201,934)
From discontinued operations	(352)		2,293		(383)	9,786
Net income (loss) attributable to parent, diluted	$ (5,372)		$ (121,357)		$ (57,108)	$ (192,148)
Denominator:
Denominator for basic earnings (loss) per share – weighted-average shares (in shares)	105,393		107,861		106,494	107,738
Effect of dilutive shares from stock options, restricted stock and performance units (in shares)	0		0		0	0
Denominator for diluted earnings (loss) per share – adjusted weighted-average shares (in shares)	105,393		107,861		106,494	107,738
Basic earnings (loss) per common share:
Loss from continuing operations (in dollars per share)	$ (0.05)		$ (1.15)		$ (0.53)	$ (1.87)
Income from discontinued operations (in dollars per share)	0		0.02		0	0.09
Net loss (in dollars per share)	(0.05)		(1.13)		(0.53)	(1.78)
Diluted earnings (loss) per common share:
Loss from continuing operations (in dollars per share)	(0.05)		(1.15)		(0.53)	(1.87)
Income from discontinued operations (in dollars per share)	0		0.02		0	0.09
Net loss (in dollars per share)	$ (0.05)		$ (1.13)		$ (0.53)	$ (1.78)