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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, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]              
Weighted average shares outstanding - basic     41,683,000   40,558,000 40,765,000 41,318,000
Incremental shares from stock based compensation     1,572,000   1,876,000 1,683,000 2,047,000
Convertible debt matured 2017     0   846,000 486,000 878,000
Weighted average shares outstanding - diluted     43,255,000   43,280,000 42,934,000 44,243,000
Options [Member]              
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]              
Anti-dilutive options excluded from diluted EPS computation     0   377,000 0 404,000
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