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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Accumulated other comprehensive income) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Gain from foreign currency translation adjustments $ 1,605 $ 2,422
Unrecognized actuarial loss on pension plan, net of tax (1,700) (1,736)
Unrealized (loss)/gain on hedging (1,044) 1,353
Accumulated other comprehensive (loss)/income $ (1,139) $ 2,039