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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, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Numerator:        
Income from continuing operations $ 25,174 $ 153,542 $ 41,072 $ 357,165
From discontinued operations (3,969) 1 (3,865) (14)
NET INCOME 21,205 153,543 37,207 357,151
Adjustment for basic earnings per share:        
Earnings allocated to unvested shareholders (483) (974) (940) (2,241)
Numerator for basic earnings per share:        
From continuing operations 24,691 152,568 40,132 354,924
From discontinued operations (3,969) 1 (3,865) (14)
Net income (loss) attributable to parent, basic 20,722 152,569 36,267 354,910
Adjustment for diluted earnings per share:        
Effect of reallocating undistributed earnings of unvested shareholders   3   10
Numerator for diluted earnings per share:        
From continuing operations 24,691 152,571 40,132 354,934
From discontinued operations (3,969) 1 (3,865) (14)
Net income (loss) attributable to parent, diluted $ 20,722 $ 152,572 $ 36,267 $ 354,920
Denominator:        
Denominator for basic earnings per share - weighted-average shares 108,014 107,646 107,933 107,812
Effect of dilutive shares from stock options and restricted stock (in shares) 452 724 497 808
Denominator for diluted earnings per share - adjusted weighted-average shares 108,466 108,370 108,430 108,620
Basic earnings per common share:        
Income from continuing operations (in dollars per share) $ 0.23 $ 1.42 $ 0.38 $ 3.29
Loss from discontinued operations (in dollars per share) (0.04)   (0.04)  
Net income (in dollars per share) 0.19 1.42 0.34 3.29
Diluted earnings per common share:        
Income from continuing operations (in dollars per share) 0.23 1.41 0.37 3.27
Loss from discontinued operations (in dollars per share) (0.04)   (0.04)  
Net income (in dollars per share) $ 0.19 $ 1.41 $ 0.33 $ 3.27
Outstanding equity awards        
Shares excluded from calculation of diluted earnings per share 2,211 667 2,211 667
Weighted-average price per share (in dollars per share) $ 62.29 $ 72.85 $ 62.29 $ 72.85