FAIR VALUE MEASUREMENT OF ASSETS AND LIABILITIES - Assets and Liabilities Measured at Fair Value (Details) - Recurring Basis - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 31, 2018
Money market funds and time deposits
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	$ 594,814	$ 452,622
Foreign exchange contracts
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	28,616	43,334
Total Liabilities	(36,085)	(25,311)
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	76,772	74,728
Level 1 | Money market funds and time deposits
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	0	0
Level 1 | Foreign exchange contracts
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	0	0
Total Liabilities	0	0
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	2,535	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	594,814	452,622
Level 2 | Foreign exchange contracts
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	28,616	43,334
Total Liabilities	(36,085)	(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	74,237	67,532
Level 3 | Money market funds and time deposits
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	0	0
Level 3 | Foreign exchange contracts
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	0	0
Total Liabilities	0	0
Level 3 | 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	$ 0	$ 0