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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, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Numerator:        
Income (loss) from continuing operations $ (48,473) $ 25,174 $ (83,027) $ 41,072
Loss from discontinued operations (345) (3,969) (854) (3,865)
NET INCOME (LOSS) (48,818) 21,205 (83,881) 37,207
Adjustment for basic earnings per share:        
Earnings allocated to unvested shareholders (445) (483) (891) (940)
Numerator for basic earnings per share:        
From continuing operations (48,918) 24,691 (83,918) 40,132
From discontinued operations (345) (3,969) (854) (3,865)
Net income (loss) attributable to parent, basic (49,263) 20,722 (84,772) 36,267
Numerator for diluted earnings per share:        
From continuing operations (48,918) 24,691 (83,918) 40,132
From discontinued operations (345) (3,969) (854) (3,865)
Net income (loss) attributable to parent, diluted $ (49,263) $ 20,722 $ (84,772) $ 36,267
Denominator:        
Denominator for basic earnings per share – weighted-average shares 108,565 108,014 108,419 107,933
Effect of dilutive shares from stock options and restricted stock (in shares)   452   497
Denominator for diluted earnings per share – adjusted weighted-average shares 108,565 108,466 108,419 108,430
Basic earnings per common share:        
Income (loss) from continuing operations (in dollars per share) $ (0.45) $ 0.23 $ (0.77) $ 0.38
Loss from discontinued operations (in dollars per share)   (0.04) (0.01) (0.04)
Net income (loss) (in dollars per share) (0.45) 0.19 (0.78) 0.34
Diluted earnings per common share:        
Income (loss) from continuing operations (in dollars per share) (0.45) 0.23 (0.77) 0.37
Loss from discontinued operations (in dollars per share)   (0.04) (0.01) (0.04)
Net income (loss) (in dollars per share) $ (0.45) $ 0.19 $ (0.78) $ 0.33
Outstanding equity awards        
Shares excluded from calculation of diluted earnings per share (in shares) 566 2,211 566 2,211
Weighted-average price per share (in dollars per share) $ 80.43 $ 62.29 $ 80.43 $ 62.29