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INCOME TAX EXPENSE (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2017
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2017
Income Tax Expense [Line Items]            
Increase in effective tax rate       2.80%    
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent         3.00%  
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent 0.80% 4.80%   1.40% 2.50%  
Effective Income Tax Rate Reconciliation, Percent 33.70% 36.80%     34.40%  
Scenario, Forecast [Member]            
Income Tax Expense [Line Items]            
Effective Income Tax Rate Reconciliation, Percent     33.60%     34.00%