FINANCIAL INSTRUMENTS - Foreign Currency Risk Management (Details) - Foreign currency contracts - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Other current assets | Derivatives designated as hedging instruments
Fair Values of Derivative Instruments
Asset Derivatives	$ 6,627	$ 11,936
Other current assets | Derivatives not designated as hedging instruments
Fair Values of Derivative Instruments
Asset Derivatives	14,376	10,086
Other current liabilities | Derivatives designated as hedging instruments
Fair Values of Derivative Instruments
Liability Derivatives	15,057	1,814
Other current liabilities | Derivatives not designated as hedging instruments
Fair Values of Derivative Instruments
Liability Derivatives	$ 10,273	$ 9,928