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EARNINGS (LOSSES) PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Numerator:                      
Income (loss) from continuing operations $ 2,175 $ (8,174) $ (1,633) $ 500,642 $ (21,711) $ (23,125) $ (48,473) $ (34,554) $ 493,010 $ (127,863) $ (52,990)
Loss from discontinued operations                 (10,338) (349) (3,838)
Net Income (Loss) $ 2,453 $ (8,008) $ (11,879) $ 500,106 $ (22,532) $ (21,799) $ (48,818) $ (35,063) 482,672 (128,212) (56,828)
Adjustment for basic earnings per share:                      
Earnings allocated to unvested shareholders                 (4,346) (1,811) (1,858)
Numerator for basic earnings per share:                      
From continuing operations                 488,664 (129,674) (54,848)
From discontinued operations                 (10,338) (349) (3,838)
Net income (loss) attributable to parent, basic                 478,326 (130,023) (58,686)
Adjustment for diluted earnings per share:                      
Effect of reallocating undistributed earnings of unvested shareholders                 7    
Numerator for diluted earnings per share:                      
From continuing operations                 488,671 (129,674) (54,848)
From discontinued operations                 (10,338) (349) (3,838)
Net income (loss) attributable to parent, diluted                 $ 478,333 $ (130,023) $ (58,686)
Denominator:                      
Denominator for basic earnings per share – weighted-average shares                 108,851 108,500 107,996
Effect of dilutive shares from stock options and restricted stock (in shares)                 536    
Denominator for diluted earnings per share – adjusted weighted-average shares                 109,387 108,500 107,996
Basic earnings per common share:                      
Income (loss) from continuing operations (in dollars per share) $ 0.02 $ (0.08) $ (0.03) $ 4.57 $ (0.20) $ (0.22) $ (0.45) $ (0.33) $ 4.49 $ (1.20) $ (0.50)
Loss from discontinued operations (in dollars per share)                 (0.10)   (0.04)
Net income (loss) (in dollars per share) 0.02 (0.08) (0.12) 4.57 (0.21) (0.21) (0.45) (0.33) 4.39 (1.20) (0.54)
Diluted earnings per common share:                      
Income (loss) from continuing operations (in dollars per share) 0.02 (0.08) (0.03) 4.55 (0.20) (0.22) (0.45) (0.33) 4.47 (1.20) (0.50)
Loss from discontinued operations (in dollars per share)                 (0.10)   (0.04)
Net income (loss) (in dollars per share) $ 0.02 $ (0.08) $ (0.12) $ 4.55 $ (0.21) $ (0.21) $ (0.45) $ (0.33) $ 4.37 $ (1.20) $ (0.54)
Outstanding equity awards                      
Shares excluded from calculation of diluted earnings per share (in shares)                 1,559 1,008 1,788
Weighted-average price per share (in dollars per share)                 $ 68.28 $ 74.38 $ 63.73