FAIR VALUE MEASUREMENT OF ASSETS AND LIABILITIES - Fair Value Hierarchy (Details) - Recurring Basis - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Level 1 | Deferred compensation plan assets: Mutual funds, money market accounts and equity securities
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	$ 2,845	$ 7,196
Level 2 | Money market funds and time deposits
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	473,888	452,622
Level 2 | Foreign exchange forward contracts
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	27,277	43,334
Total Liabilities	(27,426)	(25,311)
Level 2 | Deferred compensation plan assets: Mutual funds, money market accounts and equity securities
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	76,852	67,532
Total | Money market funds and time deposits
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	473,888	452,622
Total | Foreign exchange forward contracts
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	27,277	43,334
Total Liabilities	(27,426)	(25,311)
Total | Deferred compensation plan assets: Mutual funds, money market accounts and equity securities
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	$ 79,697	$ 74,728