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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND MARKETABLE SECURITIES (Tables)
 6 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Cash, 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):
September 30,
2021		March, 31, 2021September 30,
2020		March 31,
2020
Cash and cash equivalents$468,470 $467,176 $415,719 $338,489 
Restricted cash— — 748 1,748 
     Total cash, cash equivalents and restricted cash$468,470 $467,176 $416,467 $340,237 
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):
September 30,
2021		March, 31, 2021September 30,
2020		March 31,
2020
Cash and cash equivalents$468,470 $467,176 $415,719 $338,489 
Restricted cash— — 748 1,748 
     Total cash, cash equivalents and restricted cash$468,470 $467,176 $416,467 $340,237 
Summary of Marketable Securities
The following is a summary of marketable securities held by NetScout at September 30, 2021, classified as short-term and long-term (in thousands):
Amortized
Cost		Unrealized
Gains		Fair
Value
Type of security:
Commercial paper$7,347 — $7,347 
Total short-term marketable securities7,347 — 7,347 
Total long-term marketable securities— — — 
Total marketable securities$7,347 $— $7,347 
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 
Summary of Contractual Maturities of Marketable Securities
Contractual maturities of the Company's marketable securities held at September 30, 2021 and March 31, 2021 were as follows (in thousands):
September 30,
2021		March 31,
2021
Available-for-sale securities:
Due in 1 year or less$7,347 $9,277 
Due after 1 year through 5 years— — 
$7,347 $9,277