FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Segregation of all assets measured at fair value on a recurring basis

The table below segregates all assets that are measured at fair value on a recurring basis (which is measured at least annually) into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date.

	March 31, 2017			Quoted prices in active markets for identical assets (level 1)		Significant other observable inputs (level 2)			Significant unobservable inputs (level 3)		Balance Sheet Classification
Money market funds	$	646,386		$	646,386	$	—		$	—	Cash and cash equivalents
Bank-time deposits	46,605			46,605		—			—		Cash and cash equivalents
Commercial paper	38,268			—		38,268			—		Cash and cash equivalents
Corporate bonds	273,187			—		273,187			—		Short-term investments
Bank-time deposits	175,745			175,745		—			—		Short-term investments
Foreign currency forward contracts	2			—		2			—		Prepaid expenses and other
Foreign currency forward contracts	(352		)	—		(352		)	—		Accrued and other current liabilities
Private equity	570			—		—			570		Other assets
Contingent consideration	6,465			—		—			6,465		Other long-term liabilities
Total recurring fair value measurements, net	$	1,186,876		$	868,736	$	311,105		$	7,035

	March 31, 2016			Quoted prices in active markets for identical assets (level 1)		Significant other observable inputs (level 2)			Significant unobservable inputs (level 3)		Balance Sheet Classification
Money market funds	$	562,726		$	562,726	$	—		$	—	Cash and cash equivalents
Corporate bonds	205,250			—		205,250			—		Short-term investments
Bank-time deposits	265,570			265,570		—			—		Short-term investments
Foreign currency forward contracts	(137		)	—		(137		)	—		Accrued and other current liabilities
Total recurring fair value measurements, net	$	1,033,409		$	828,296	$	205,113		$	—