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EARNINGS (LOSSES) PER COMMON SHARE - Computation of Basic and DIluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Numerator:    
Income from continuing operations $ 30,729 $ 8,364
Income (loss) from discontinued operations (124) 10,595
Net income 30,605 18,959
Adjustment for basic earnings per share    
Earnings allocated to unvested shareholders (991) (777)
Numerator for basic earnings (loss) per share:    
From continuing operations 29,738 7,587
From discontinued operations (124) 10,595
Net income (loss) attributable to parent, basic 29,614 18,182
Adjustment for diluted earnings (loss) per share:    
Effect of reallocating undistributed earnings of unvested shareholders 0 (1)
Numerator for diluted earnings (loss) per share:    
From continuing operations 29,738 7,586
From discontinued operations (124) 10,595
Net income (loss) attributable to parent, diluted $ 29,614 $ 18,181
Denominator:    
Denominator for basic earnings (loss) per share – weighted-average shares (in shares) 108,555 109,142
Effect of dilutive shares from stock options, restricted stock and performance share units (in shares) 169 283
Denominator for diluted earnings (loss) per share – adjusted weighted-average shares (in shares) 108,724 109,425
Basic earnings per common share:    
Income from continuing operations (in dollars per share) $ 0.27 $ 0.07
Income from discontinued operations (in dollars per share) 0 0.10
Net income (in dollars per share) 0.27 0.17
Diluted earnings per common share:    
Income (loss) from continuing operations (in dollars per share) 0.27 0.07
Income from discontinued operations (in dollars per share) 0 0.10
Net income (in dollars per share) $ 0.27 $ 0.17