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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND MARKETABLE SECURITIES
 9 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND MARKETABLE SECURITIES CASH, CASH EQUIVALENTS, RESTRICTED CASH AND MARKETABLE SECURITIESThe Company considers all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents and those investments with original maturities greater than three months to be marketable securities. Cash and cash equivalents consisted of commercial paper, money market instruments and cash at December 31, 2020 and U.S. government and municipal obligations, commercial paper, money market instruments and cash maintained with various financial institutions at March 31, 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):
December 31,
2020		March 31, 2020December 31,
2019		March 31,
2019
Cash and cash equivalents$477,755 $338,489 $287,660 $409,632 
Restricted cash748 1,748 1,000 188 
     Total cash, cash equivalents and restricted cash$478,503 $340,237 $288,660 $409,820 
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 December 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$3,559 $17 $3,576 
Commercial paper7,196 — 7,196 
Corporate bonds1,916 1 1,917 
Total short-term marketable securities12,671 18 12,689 
Total long-term marketable securities— — — 
Total marketable securities$12,671 $18 $12,689 
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 December 31, 2020 and March 31, 2020 were as follows (in thousands):
December 31,
2020		March 31,
2020
Available-for-sale securities:
Due in 1 year or less$12,689 $47,969 
Due after 1 year through 5 years— 2,613 
$12,689 $50,582