EARNINGS (LOSS) PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Income from continuing operations	$ 8,364	$ 500,642
Income (loss) from discontinued operations	10,595	(536)
Net Income	18,959	500,106
Adjustment for basic earnings per share:
Earnings allocated to unvested shareholders	(777)	(3,537)
Numerator for basic earnings per share:
From continuing operations	7,587	497,105
From discontinued operations	10,595	(536)
Net income (loss) attributable to parent, basic	18,182	496,569
Adjustment for diluted earnings per share:
Effect of reallocating undistributed earnings of unvested shareholders	(1)	10
Numerator for diluted earnings per share:
From continuing operations	7,586	497,115
From discontinued operations	10,595	(536)
Net income (loss) attributable to parent, diluted	$ 18,181	$ 496,579
Denominator:
Denominator for basic earnings per share – weighted-average shares	109,142	108,683
Effect of dilutive shares from stock options, restricted stock and performance units (in shares)	283	412
Denominator for diluted earnings per share – adjusted weighted-average shares	109,425	109,095
Basic earnings per common share:
Income from continuing operations (in dollars per share)	$ 0.07	$ 4.57
Income from discontinued operations (in dollars per share)	0.10
Net income (in dollars per share)	0.17	4.57
Diluted earnings per common share:
Income from continuing operations (in dollars per share)	0.07	4.55
Income from discontinued operations (in dollars per share)	0.10
Net income (in dollars per share)	$ 0.17	$ 4.55
Outstanding equity awards
Shares excluded from calculation of diluted earnings per share (in shares)	2,089	3,377
Weighted-average price per share (in dollars per share)	$ 67.25	$ 63.47