CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Tables)

6 Months Ended

Sep. 30, 2012

Components of Marketable Securities

The following is a summary of marketable securities held by NetScout at September 30, 2012 classified as short-term and long-term (in thousands):

	Amortized Cost		Unrealized Gains		Fair Value
Type of security:
U.S. government and municipal obligations	$	27,190	$	16	$	27,206
Commercial paper		26,668		3		26,671
Corporate bonds		10,197		8		10,205
Certificates of deposit		5,521		1		5,522
Total short-term marketable securities		69,576		28		69,604
U.S. government and municipal obligations		2,607		4		2,611
Corporate bonds		3,004		0		3,004
Total long-term marketable securities		5,611		4		5,615
Total marketable securities	$	75,187	$	32	$	75,219

The following is a summary of marketable securities held by NetScout at March 31, 2012, classified as short-term and long-term (in thousands):

	Amortized Cost		Unrealized Gains (Losses)			Fair Value
Type of security:
U.S. government and municipal obligations	$	17,779	$	20		$	17,799
Commercial paper		22,469		0			22,469
Corporate bonds		18,531		(1	)		18,530
Certificates of deposit		3,208		(1	)		3,207
Auction rate securities		17,612		0			17,612
Total short-term marketable securities		79,599		18			79,617
Auction rate securities		1,651		(190	)		1,461
U.S. government and municipal obligations		13,828		8			13,836
Corporate bonds		1,345		2			1,347
Total long-term marketable securities		16,824		(180	)		16,644
Total marketable securities	$	96,423	$	(162	)	$	96,261

Contractual Maturities Of Marketable Securities

Contractual maturities of the Company’s marketable securities held at September 30, 2012 and March 31, 2012 were as follows (in thousands):

	September 30, 2012		March  31, 2012
Available-for-sale securities:
Due in 1 year or less	$	69,604	$	79,617
Due after 1 year through 5 years		5,615		15,183
Due after 10 years		0		1,461
	$	75,219	$	96,261