FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Mar. 31, 2013

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 as of March 31, 2013 and 2012. The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value. Level 1 refers to fair values determined based on quoted prices in active markets for identical assets. Level 2 refers to fair values estimated using significant other observable inputs, and Level 3 includes fair values estimated using significant non-observable inputs.

	Fair Value Measurements at March 31, 2013
	Level 1		Level 2			Level 3			Total
ASSETS:
Cash and cash equivalents	$	99,930	$	0		$	0		$	99,930
U.S. government and municipal obligations		31,645		0			0			31,645
Commercial paper		0		12,390			0			12,390
Corporate bonds		5,166		0			0			5,166
Certificate of deposits		0		4,960			0			4,960
Derivative financial instruments		0		71			0			71
	$	136,741	$	17,421		$	0		$	154,162
LIABILITIES:
Contingent consideration	$	0	$	0		$	(5,087	)	$	(5,087	)
Contingent contractual non-compliance liability		0		0			(246	)		(246	)
Derivative financial instruments		0		(249	)		0			(249	)
	$	0	$	(249	)	$	(5,333	)	$	(5,582	)

	Fair Value Measurements at March 31, 2012
	Level 1		Level 2			Level 3			Total
ASSETS:
Cash and cash equivalents	$	117,255	$	0		$	0		$	117,255
U.S. government and municipal obligations		31,635		0			0			31,635
Commercial paper		0		22,469			0			22,469
Corporate bonds		19,877		0			0			19,877
Certificate of deposits		0		3,207			0			3,207
Auction rate securities		0		17,612			1,461			19,073
Derivative financial instruments		0		150			0			150
	$	168,767	$	43,438		$	1,461		$	213,666
LIABILITIES:
Contingent consideration	$	0	$	0		$	(8,213	)	$	(8,213	)
Contingent contractual non-compliance liability		0		0			(700	)		(700	)
Derivative financial instruments		0		(166	)		0			(166	)
	$	0	$	(166	)	$	(8,913	)	$	(9,079	)

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 for the year ended March 31, 2013 (in thousands):

	Auction Rate Securities			Contingent Purchase Consideration			Contingent Contractual Non-compliance Liability
Balance at March 31, 2012	$	1,461		$	8,213		$	700
Change in fair value (included within research and development expense)		0			912			(184	)
ARSs redeemed by issuers		(1,650	)		0			0
Unrealized gains included in accumulated other comprehensive income (loss)		190			0			0
Unrealized gain (loss) included in earnings		(1	)		0			0
Payments		0			(4,038	)		(270	)
Balance at March 31, 2013	$	0		$	5,087		$	246

The following table sets forth a reconciliation of changes in the fair value of the Company’s Level 3 financial assets for the year ended March 31, 2012 (in thousands):

	Auction Rate Securities			Contingent Purchase Consideration			Contingent Contractual Non-compliance Liability
Balance at March 31, 2011	$	17,482		$	0		$	0
Additions to Level 3		0			8,000			1,600
Transfers out of Level 3		(17,612	)
Change in fair value (included within research and development expense)		0			1,059			(900	)
ARSs redeemed by issuers at par		(500	)		0			0
Unrealized gains included in accumulated other comprehensive income (loss)		2,112			0			0
Unrealized gain (loss) included in earnings		(21	)		0			0
Payments		0			(846	)		0
Balance at March 31, 2012	$	1,461		$	8,213		$	700