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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Numerator:    
Income (loss) from continuing operations $ (34,554) $ 15,898
Income (loss) from discontinued operations (509) 104
NET INCOME (LOSS) (35,063) 16,002
Adjustment for basic earnings per share:    
Earnings allocated to unvested shareholders (446) (260)
Numerator for basic earnings per share:    
From continuing operations (35,000) 15,638
From discontinued operations (509) 104
Net income (loss) attributable to parent, basic (35,509) 15,742
Numerator for diluted earnings per share:    
From continuing operations (35,000) 15,638
From discontinued operations (509) 104
Net income (loss) attributable to parent, diluted $ (35,509) $ 15,742
Denominator:    
Denominator for basic earnings per share - weighted-average shares 108,276 107,852
Effect of dilutive shares from stock options and restricted stock (in shares)   557
Denominator for diluted earnings per share - adjusted weighted-average shares 108,276 108,409
Basic earnings per common share:    
Income (loss) from continuing operations (in dollars per share) $ (0.33) $ 0.15
Net income (loss) (in dollars per share) (0.33) 0.15
Diluted earnings per common share:    
Income (loss) from continuing operations (in dollars per share) (0.33) 0.15
Net income (loss) (in dollars per share) $ (0.33) $ 0.15
Outstanding equity awards    
Shares excluded from calculation of diluted earnings per share 555 1,899
Weighted-average price per share (in dollars per share) $ 80.63 $ 63.66