FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

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

The table below segregates all assets and liabilities 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.

	December 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	$	419,642		$	419,642				$	—		Cash and cash equivalents
Bank-time deposits	53,598			53,598					—			Cash and cash equivalents
Commercial paper	17,294					17,294			—			Cash and cash equivalents
Corporate bonds	10,246					10,246			—			Cash and cash equivalents
Bank-time deposits	166,321			166,321					—			Short-term investments
Corporate bonds	362,416					362,416			—			Short-term investments
Commercial paper	13,921					13,921			—			Short-term investments
Mutual funds	4,671					4,671			—			Short-term investments
Foreign currency forward contracts	134			—		134			—			Prepaid expenses and other
Foreign currency forward contracts	(18		)	—		(18		)	—			Accrued expense and other current liabilities
Cross-currency swap	(8,626		)	—		(8,626		)	—			Accrued expense and other current liabilities
Private equity	917			—		—			917			Other assets
Contingent consideration	(136		)	—		—			(136		)	Other long-term liabilities
Total recurring fair value measurements, net	$	1,040,380		$	639,561	$	400,038		$	781

	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	243,019			—		243,019			—			Short-term investments
Bank-time deposits	175,745			175,745		—			—			Short-term investments
Commercial paper	25,936			—		25,936			—			Short-term investments
Mutual funds	4,232			—		4,232			—			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	$	1,173,946		$	868,736	$	311,105		$	(5,895	)