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CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES
 12 Months Ended
Mar. 31, 2021
Cash and Cash Equivalents [Abstract]  
CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES
Cash and cash equivalents mainly consisted of U.S government and municipal obligations, commercial paper, corporate bonds, money market instruments and cash maintained with various financial institutions at March 31, 2021 and 2020.
Cash, Cash Equivalents and 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, 2021March 31, 2020March 31, 2019March 31, 2018
Cash and cash equivalents$467,176 $338,489 $409,632 $369,821 
Restricted cash$— 1,748 188 910 
     Total cash, cash equivalents and restricted cash$467,176 $340,237 $409,820 $370,731 
The Company's restricted cash includes cash balances which are legally or contractually restricted. The Company's restricted cash is included within prepaid and other current assets and consists of amounts related to holdbacks associated with prior acquisitions.
Marketable Securities
The following is a summary of marketable securities held by NetScout at March 31, 2021 classified as short-term and long-term (in thousands):
Amortized
Cost		Unrealized
Gains		Fair
Value
Type of security:
U.S. government and municipal obligations$3,571 $7 $3,578 
Commercial paper5,699 — 5,699 
Total short-term marketable securities9,270 7 9,277 
Total long-term marketable securities— — — 
Total marketable securities$9,270 $7 $9,277 
 
The following is a summary of marketable securities held by NetScout at March 31, 2020, classified as short-term and long-term (in thousands):
Amortized
Cost		Unrealized
Gains		Fair
Value
Type of security:
U.S. government and municipal obligations$28,621 $107 $28,728 
Commercial paper14,644 — 14,644 
Corporate bonds4,587 10 4,597 
Total short-term marketable securities47,852 117 47,969 
U.S. government and municipal obligations2,562 51 2,613 
Total long-term marketable securities2,562 51 2,613 
Total marketable securities$50,414 $168 $50,582 
Contractual maturities of the Company's marketable securities held at March 31, 2021 and 2020 (in thousands) were as follows:
March 31,
2021		March 31,
2020
Available-for-sale securities:
Due in 1 year or less$9,277 $47,969 
Due after 1 year through 5 years— 2,613 
$9,277 $50,582