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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2018
Income Tax Contingency [Line Items]          
Income tax expense $ 476 $ 2,517 $ 12,708 $ 11,258  
Effective tax rate, percent     22.90% 20.70%  
Tax Cuts and Jobs Act of 2017, change in tax rate, income tax expense (benefit)     $ 3,600    
Forecast          
Income Tax Contingency [Line Items]          
Federal statutory prorated rate, percent         24.53%