FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Sep. 30, 2013

FAIR VALUE MEASUREMENTS

Schedule of financial assets measured at fair value on recurring basis, based on the fair value hierarchy

(In thousands)	September 30, 2013		March 31, 2013
Level 1 — Financial Assets
Money market funds	$	57,115	$	16,549
Total Level 1 Financial Assets	57,115		16,549
Level 2 — Financial Assets
Corporate debentures/bonds	42,184		75,572
Government agency bonds	18,321		—
Commercial paper	3,996		28,974
Certificates of deposit	4,000		4,000
Total Level 2 Financial Assets	68,501		108,546
Total cash equivalents and short-term investments	$	125,616	$	125,095

Schedule of available-for-sale securities

(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
September 30, 2013:
Short-term investments:
Corporate debentures/bonds	$	42,169	$	20	$	(5	)	$	42,184
Government agency bonds	18,309		12		—			18,321
Commercial paper	3,996		—		—			3,996
Certificates of deposit	4,000		—		—			4,000
Total short-term investments	$	68,474	$	32	$	(5	)	$	68,501
Cash equivalents:
Money market funds	57,115		—		—			57,115
Total cash equivalents	$	57,115	$	—	$	—		$	57,115

(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
March 31, 2013:
Short-term investments:
Corporate debentures/bonds	$	75,578	$	14	$	(20	)	$	75,572
Commercial paper	28,974		—		—			28,974
Certificates of deposit	4,000		—		—			4,000
Total short-term investments	$	108,552	$	14	$	(20	)	$	108,546
Cash equivalents:
Money market funds	16,549		—		—			16,549
Total cash equivalents	$	16,549	$	—	$	—		$	16,549