FAIR VALUE MEASUREMENT OF ASSETS AND LIABILITIES - Fair Value Hierarchy (Details) - USD ($)	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Assets held for sale	$ 5,600,000
Transfers out of Level 2 and into Level 1 related to assets and liabilities measured on a recurring and nonrecurring basis	0	$ 0
Proceeds from sale of long lived assets held for ale	300,000	41,500,000
Gain on sale of assets held for sale		12,100,000
Impairment charges for assets no longer in use and held for sale	0	0
Recurring Basis | 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	9,228,000	9,068,000
Recurring Basis | Level 2 | Money market funds and time deposits
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	1,074,132,000	674,859,000
Recurring Basis | Level 2 | Foreign exchange forward contracts (Note 7)
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	22,648,000	25,829,000
Total Liabilities	(21,091,000)	(31,057,000)
Recurring Basis | 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	40,556,000	37,041,000
Recurring Basis | Level 3 | Deferred purchase price receivable (Note 9)
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	501,097,000	600,672,000
Recurring Basis | Level 3 | Contingent consideration in connection with business acquisitions
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Liabilities	(73,423,000)	(4,500,000)
Nonrecurring Basis | Level 2
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Assets held for sale		5,576,000
Total | Recurring Basis | Money market funds and time deposits
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	1,074,132,000	674,859,000
Total | Recurring Basis | Deferred purchase price receivable (Note 9)
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	501,097,000	600,672,000
Total | Recurring Basis | Foreign exchange forward contracts (Note 7)
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Assets	22,648,000	25,829,000
Total Liabilities	(21,091,000)	(31,057,000)
Total | Recurring Basis | 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	49,784,000	46,109,000
Total | Recurring Basis | Contingent consideration in connection with business acquisitions
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Total Liabilities	$ (73,423,000)	(4,500,000)
Total | Nonrecurring Basis
Financial Instruments Measured at Fair Value on a Recurring Basis and Nonrecurring Basis
Assets held for sale		$ 5,576,000