CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Tables)

9 Months Ended

Dec. 31, 2012

Components Of Marketable Securities

The following is a summary of marketable securities held by NetScout at December 31, 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	$	15,751	$	5	$	15,756
Commercial paper		13,587		0		13,587
Corporate bonds		3,076		0		3,076
Certificates of deposit		2,905		0		2,905
Total short-term marketable securities		35,319		5		35,324
U.S. government and municipal obligations		10,019		1		10,020
Corporate bonds		518		2		520
Total long-term marketable securities		10,537		3		10,540
Total marketable securities	$	45,856	$	8	$	45,864

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

	December 31, 2012		March 31, 2012
Available-for-sale securities:
Due in 1 year or less	$	35,324	$	79,617
Due after 1 year through 5 years		10,540		15,183
Due after 10 years		0		1,461
	$	45,864	$	96,261