FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Mar. 31, 2017

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 March 31, 2017 and 2016 (in thousands):

	Fair Value Measurements at
	March 31, 2017
	Level 1		Level 2			Level 3			Total
ASSETS:
Cash and cash equivalents	$	304,880	$	—		$	—		$	304,880
U.S. government and municipal obligations	40,628		80,273			—			120,901
Commercial paper	—		29,469			—			29,469
Corporate bonds	7,956		—			—			7,956
Certificate of deposits	—		1,499			—			1,499
Derivative financial instruments	—		110			—			110
	$	353,464	$	111,351		$	—		$	464,815
LIABILITIES:
Contingent purchase consideration	$	—	$	—		$	(5,449	)	$	(5,449	)
Derivative financial instruments	—		(213		)	—			(213		)
	$	—	$	(213	)	$	(5,449	)	$	(5,662	)

	Fair Value Measurements at
	March 31, 2016
	Level 1		Level 2			Level 3			Total
ASSETS:
Cash and cash equivalents	$	210,711	$	—		$	—		$	210,711
U.S. government and municipal obligations	41,116		82,212			—			123,328
Commercial paper	—		16,172			—			16,172
Corporate bonds	1,864		—			—			1,864
Derivative financial instruments	—		191			—			191
Contingently returnable consideration	—		—			16,131			16,131
	$	253,691	$	98,575		$	16,131		$	368,397
LIABILITIES:
Contingent consideration	$	—	$	—		$	(7,293	)	$	(7,293	)
Derivative financial instruments	—		(158		)	—			(158		)
	$	—	$	(158	)	$	(7,293	)	$	(7,451	)

Schedule of Reconciliation of Changes in Fair Value of Level Three Financial Liabilities

The following table sets forth a reconciliation of changes in the fair value of the Company’s Level 3 financial liabilities for the year ended March 31, 2016 (in thousands):

	Contingent Purchase Consideration			Contingently Returnable Consideration
Balance at March 31, 2015	$	(4,484	)	$	—
(Increase) / decrease in fair value and accretion expense (included within research and development expense)	(152		)	—
Contingently returnable consideration	—			19,125
Increase in fair value	(21		)	3,676
Gross presentation of contingently returnable consideration to contingent purchase consideration	(2,636		)	2,636
Payments received	—			(9,306		)
Balance at March 31, 2016	$	(7,293	)	$	16,131

The following table sets forth a reconciliation of changes in the fair value of the Company’s Level 3 financial liabilities for the year ended March 31, 2017 (in thousands):

	Contingent Purchase Consideration			Contingently Returnable Consideration
Balance at March 31, 2016	$	(7,293	)	$	16,131
Additions to Level 3	(660		)	—
Increase in fair value and accretion expense (included within research and development expense)	(153		)	—
Decrease in fair value	—			(610		)
Gross presentation of contingently returnable consideration to contingent purchase consideration	(3,910		)	3,910
Payments received	—			(19,431		)
Payments made	6,567			—
Balance at March 31, 2017	$	(5,449	)	$	—