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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Accumulated other comprehensive income) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Gain from foreign currency translation adjustments $ 10,014 $ 2,422
Unrecognized actuarial loss on pension plan, net of tax (1,761) (1,736)
Unrealized gain on hedging 842 1,353
Accumulated other comprehensive income $ 9,095 $ 2,039