CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Tables)

12 Months Ended

Mar. 31, 2017

Cash and Cash Equivalents [Abstract]

Summary of Marketable Securities Classified as Short-term and Long-term

The following is a summary of marketable securities held by NetScout at March 31, 2017 classified as short-term and long-term (in thousands):

	Amortized Cost		Unrealized Losses			Fair Value
Type of security:
U.S. government and municipal obligations	$	98,989	$	(21	)	$	98,968
Commercial paper	29,469		—			29,469
Corporate bonds	7,959		(3		)	7,956
Certificates of deposit	1,499		—			1,499
Total short-term marketable securities	137,916		(24		)	137,892
U.S. government and municipal obligations	21,952		(19		)	21,933
Total long-term marketable securities	21,952		(19		)	21,933
Total marketable securities	$	159,868	$	(43	)	$	159,825

The following is a summary of marketable securities held by NetScout at March 31, 2016, classified as short-term and long-term (in thousands):

	Amortized Cost		Unrealized Gains		Fair Value
Type of security:
U.S. government and municipal obligations	$	109,963	$	4	$	109,967
Commercial paper	16,172		—		16,172
Corporate bonds	1,864		—		1,864
Total short-term marketable securities	127,999		4		128,003
U.S. government and municipal obligations	13,349		12		13,361
Total long-term marketable securities	13,349		12		13,361
Total marketable securities	$	141,348	$	16	$	141,364

Summary of Contractual Maturities of Marketable Securities

Contractual maturities of the Company’s marketable securities held at March 31, 2017 and March 31, 2016 were as follows (in thousands):

	March 31, 2017		March 31, 2016
Available-for-sale securities:
Due in 1 year or less	$	137,892	$	128,003
Due after 1 year through 5 years	21,933		13,361
	$	159,825	$	141,364