FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Jun. 30, 2013

FAIR VALUE MEASUREMENTS

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

(In thousands)	June 30, 2013		March 31, 2013
Level 1 — Financial Assets
Money market funds	$	65,188	$	16,549
Total Level 1 Financial Assets	65,188		16,549
Level 2 — Financial Assets
Corporate debentures/bonds	48,420		75,572
Commercial paper	7,992		28,974
Certificates of deposit	4,000		4,000
Total Level 2 Financial Assets	60,412		108,546
Total cash equivalents and short-term investments	$	125,600	$	125,095

Schedule of available-for-sale securities

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
June 30, 2013:
Short-term investments:
Corporate debentures/bonds	$	48,452	$	1	$	(33	)	$	48,420
Commercial paper	7,992		—		—			7,992
Certificates of deposit	4,000		—		—			4,000
Total short-term investments	$	60,444	$	1	$	(33	)	$	60,412
Cash equivalents:
Money market funds	$	65,188	—		—			$	65,188
Total cash equivalents	$	65,188	$	—	$	—		$	65,188

	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