FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities

The following tables present the Company’s financial assets and liabilities measured on a recurring basis using the fair value hierarchy at September 30, 2015 and March 31, 2015 (in thousands):

	Fair Value Measurements at
	September 30, 2015
	Level 1		Level 2			Level 3			Total
ASSETS:
Cash and cash equivalents	$	215,539	$	—		$	—		$	215,539
U.S. government and municipal obligations	34,084		92,156			—			126,240
Commercial paper	—		2,990			—			2,990
Corporate bonds	6,616		—			—			6,616
Derivative financial instruments	—		34			—			34
Contingently returnable consideration	$	—	$	—		$	19,125		$	19,125
	$	256,239	$	95,180		$	19,125		$	370,544
LIABILITIES:
Contingent purchase consideration	$	—	$	—		$	(4,560	)	$	(4,560	)
Derivative financial instruments	—		(416		)	—			(416		)
	$	—	$	(416	)	$	(4,560	)	$	(4,976	)

	Fair Value Measurements at
	March 31, 2015
	Level 1		Level 2			Level 3			Total
ASSETS:
Cash and cash equivalents	$	104,893	$	—		$	—		$	104,893
U.S. government and municipal obligations	46,564		98,781			—			145,345
Commercial paper	—		5,095			—			5,095
Corporate bonds	9,524		—			—			9,524
Derivative financial instruments	—		15			—			15
	$	160,981	$	103,891		$	—		$	264,872
LIABILITIES:
Contingent purchase consideration	$	—	$	—		$	(4,484	)	$	(4,484	)
Derivative financial instruments	—		(1,664		)	—			(1,664		)
	$	—	$	(1,664	)	$	(4,484	)	$	(6,148	)

Schedule of Reconciliation of Changes in Fair Value of Level III Financial Assets

The following table sets forth a reconciliation of changes in the fair value of the Company’s Level 3 financial assets and liabilities for the six months ended September 30, 2015 (in thousands):

	Contingent Purchase Consideration			Contingently Returnable Consideration
Balance at beginning of period	$	(4,484	)	$	—
Increase in fair value and accretion expense (included within research and development expense)	(76		)
Contingently returnable consideration				19,125
Balance at end of period	$	(4,560	)	$	19,125