CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Tables)

12 Months Ended

Mar. 31, 2013

Components of Marketable Securities

The following is a summary of marketable securities held by NetScout at March 31, 2013 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	$	17,416	$	11	$	17,427
Commercial paper		12,390		0		12,390
Corporate bonds		2,559		2		2,561
Certificates of deposit		4,960		0		4,960
Total short-term marketable securities		37,325		13		37,338
U.S. government and municipal obligations		14,211		7		14,218
Corporate bonds		2,605		0		2,605
Total long-term marketable securities		16,816		7		16,823
Total marketable securities	$	54,141	$	20	$	54,161

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 March 31, 2013 and March 31, 2012 were as follows (in thousands):

	March 31, 2013		March 31, 2012
Available-for-sale securities:
Due in 1 year or less	$	37,338	$	79,617
Due after 1 year through 5 years		16,823		15,183
Due after 10 years		0		1,461
	$	54,161	$	96,261