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EARNINGS PER SHARE (EPS) (Details) - Summary of Reconciliation of Share Amounts Used in Earnings Per Share - USD ($)
3 Months Ended 9 Months Ended
Jan. 17, 2017
Jul. 14, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Weighted average shares outstanding - basic     40,295,000 41,683,000 41,232,000 40,765,000
Incremental shares from stock based compensation     1,447,000 1,572,000 1,388,000 1,683,000
Convertible debt matured 2017     0 0 0 486,000
Weighted average shares outstanding - diluted     41,742,000 43,255,000 42,620,000 42,934,000
Senior notes due 2022 [Member]            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Debt conversion, original debt, amount   $ 125,000,000        
Convertible Notes 2017 [Member]            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Debt conversion, converted instrument, amount $ 173,855,000     $ 173,855,000    
Debt conversion, converted instrument, cash received $ 125,000,000     $ 125,000,000    
Debt conversion, converted instrument, shares issued 1,954,993     1,954,993