FINANCIAL INSTRUMENTS - Foreign Currency Risk Management (Details) - Foreign currency contracts - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 31, 2018
Other current assets | Derivatives designated as hedging instruments
Fair Values of Derivative Instruments
Asset Derivatives	$ 7,049	$ 19,422
Other current assets | Derivatives not designated as hedging instruments
Fair Values of Derivative Instruments
Asset Derivatives	21,567	23,912
Other current liabilities | Derivatives designated as hedging instruments
Fair Values of Derivative Instruments
Liability Derivatives	14,377	7,065
Other current liabilities | Derivatives not designated as hedging instruments
Fair Values of Derivative Instruments
Liability Derivatives	$ 21,708	$ 18,246