CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Tables)

3 Months Ended

Jun. 30, 2012

Components of Marketable Securities

The following is a summary of marketable securities held by NetScout at June 30, 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	$	26,711	$	14		$	26,725
Commercial paper		32,359		2			32,361
Corporate bonds		12,222		(4	)		12,218
Certificates of deposit		3,214		(1	)		3,213
Total short-term marketable securities		74,506		11			74,517
U.S. government and municipal obligations		28,161		(15	)		28,146
Corporate bonds		1,545		(1	)		1,544
Total long-term marketable securities		29,706		(16	)		29,690
Total marketable securities	$	104,212	$	(5	)	$	104,207

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 June 30, 2012 and March 31, 2012 were as follows (in thousands):

	June 30, 2012		March 31, 2012
Available-for-sale securities:
Due in 1 year or less	$	74,517	$	79,617
Due after 1 year through 5 years		29,690		15,183
Due after 10 years		0		1,461
	$	104,207	$	96,261