CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Tables)

12 Months Ended

Mar. 31, 2018

Cash and Cash Equivalents [Abstract]

Schedule of Cash and Cash Equivalents

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the consolidated statements of cash flows (in thousands):

	March 31, 2018		March 31, 2017		March 31, 2016		March 31, 2015
Cash and cash equivalents	$	369,821	$	304,880	$	210,711	$	104,893
Restricted cash	910		846		186		186
Total cash, cash equivalents and restricted cash	$	370,731	$	305,726	$	210,897	$	105,079

Schedule of Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the consolidated statements of cash flows (in thousands):

	March 31, 2018		March 31, 2017		March 31, 2016		March 31, 2015
Cash and cash equivalents	$	369,821	$	304,880	$	210,711	$	104,893
Restricted cash	910		846		186		186
Total cash, cash equivalents and restricted cash	$	370,731	$	305,726	$	210,897	$	105,079

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, 2018 classified as short-term and long-term (in thousands):

	Amortized Cost		Unrealized Losses			Fair Value
Type of security:
U.S. government and municipal obligations	$	42,246	$	(60	)	$	42,186
Commercial paper	33,003		—			33,003
Corporate bonds	2,754		(2		)	2,752
Total short-term marketable securities	78,003		(62		)	77,941
Total long-term marketable securities	—		—			—
Total marketable securities	$	78,003	$	(62	)	$	77,941

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

Summary of Contractual Maturities of Marketable Securities

Contractual maturities of the Company’s marketable securities held at March 31, 2018 and March 31, 2017 were as follows (in thousands):

	March 31, 2018		March 31, 2017
Available-for-sale securities:
Due in 1 year or less	$	77,941	$	137,892
Due after 1 year through 5 years	—		21,933
	$	77,941	$	159,825