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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Numerator:        
Income (loss) from continuing operations $ (1,633) $ (48,473) $ 499,009 $ (83,027)
Loss from discontinued operations (10,246) (345) (10,782) (854)
NET INCOME (LOSS) (11,879) (48,818) 488,227 (83,881)
Adjustment for basic earnings per share:        
Earnings allocated to unvested shareholders (717) (445) (4,106) (891)
Numerator for basic earnings per share:        
From continuing operations (2,350) (48,918) 494,903 (83,918)
From discontinued operations (10,246) (345) (10,782) (854)
Net income (loss) attributable to parent, basic (12,596) (49,263) 484,121 (84,772)
Adjustment for diluted earnings per share:        
Effect of reallocating undistributed earnings of unvested shareholders     11  
Numerator for diluted earnings per share:        
From continuing operations (2,350) (48,918) 494,914 (83,918)
From discontinued operations (10,246) (345) (10,782) (854)
Net income (loss) attributable to parent, diluted $ (12,596) $ (49,263) $ 484,132 $ (84,772)
Denominator:        
Denominator for basic earnings per share – weighted-average shares 108,868 108,565 108,775 108,419
Effect of dilutive shares from stock options and restricted stock (in shares)     437  
Denominator for diluted earnings per share – adjusted weighted-average shares 108,868 108,565 109,212 108,419
Basic earnings per common share:        
Income (loss) from continuing operations (in dollars per share) $ (0.03) $ (0.45) $ 4.55 $ (0.77)
Loss from discontinued operations (in dollars per share) (0.09)   (0.10) (0.01)
Net income (loss) (in dollars per share) (0.12) (0.45) 4.45 (0.78)
Diluted earnings per common share:        
Income (loss) from continuing operations (in dollars per share) (0.03) (0.45) 4.53 (0.77)
Loss from discontinued operations (in dollars per share) (0.09)   (0.10) (0.01)
Net income (loss) (in dollars per share) $ (0.12) $ (0.45) $ 4.43 $ (0.78)
Outstanding equity awards        
Shares excluded from calculation of diluted earnings per share (in shares) 1,613 566 1,676 566
Weighted-average price per share (in dollars per share) $ 68.69 $ 80.43 $ 68.12 $ 80.43