10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2021

OR

☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from                      to

Commission file number 000-26251

NETSCOUT SYSTEMS, INC.

(Exact Name of Registrant as Specified in Its Charter)

Delaware	04-2837575
(State or Other Jurisdiction of Incorporation or Organization)	(IRS Employer Identification No.)

310 Littleton Road, Westford, MA 01886

(978) 614-4000

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered:
Common Stock, $0.001 par value per share	NTCT	Nasdaq Global Select Market

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):

        Large accelerated filer  ☒            Accelerated filer             ☐    

        Non-accelerated filer   ☐             Smaller reporting company    ☐

                            Emerging growth company    ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes  ☐    No  ☒

The number of shares outstanding of the registrant's common stock, par value $0.001 per share, as of October 27, 2021 was 73,874,712.

NETSCOUT SYSTEMS, INC.

FORM 10-Q

FOR THE QUARTER ENDED SEPTEMBER 30, 2021

TABLE OF CONTENTS

CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING STATEMENTS		1
PART I: FINANCIAL INFORMATION
Item 1.	Unaudited Financial Statements:
	Consolidated Balance Sheets: At September 30, 2021 and March 31, 2021	2
	Consolidated Statements of Operations: For the three and six months ended September 30, 2021 and 2020	3
	Consolidated Statements of Comprehensive Income (Loss): For the three and six months ended September 30, 2021 and 2020	4
	Consolidated Statements of Stockholder's Equity: For the three and six months ended September 30, 2021 and 2020	5
	Consolidated Statements of Cash Flows: For the six months ended September 30, 2021 and 2020	7
	Notes to Consolidated Financial Statements	8
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	24
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	39
Item 4.	Controls and Procedures	39
PART II: OTHER INFORMATION
Item 1.	Legal Proceedings	40
Item 1A.	Risk Factors	40
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	40
Item 3.	Defaults Upon Senior Securities	40
Item 4.	Mine Safety Disclosures	40
Item 5.	Other Information	40
Item 6.	Exhibits	41
SIGNATURES		42

Unless the context suggests otherwise, references in this Quarterly Report on Form 10-Q, or Quarterly Report, to "NetScout," the "Company," "we," "us," and "our" refer to NetScout Systems, Inc. and, where appropriate, our consolidated subsidiaries.

NetScout, the NetScout logo, Adaptive Service Intelligence and other trademarks or service marks of NetScout appearing in this Quarterly Report are the property of NetScout Systems, Inc. and/or its subsidiaries and/or affiliates in the United States and/or other countries. Any third-party trade names, trademarks and service marks appearing in this Quarterly Report are the property of their respective holders.

Cautionary Statement Concerning Forward-Looking Statements

In addition to historical information, the following discussion and other parts of this Quarterly Report contain forward-looking statements under Section 21E of the Securities Exchange Act of 1934, as amended, and other federal securities laws. These forward-looking statements involve risks and uncertainties. These statements relate to future events or our future financial performance and are identified by terminology such as "may," "will," "could," "should," "expects," "plans," "intends," "seeks," "anticipates," "believes," "estimates," "potential" or "continue," or the negative of such terms or other comparable terminology. These statements are only predictions. You should not place undue reliance on these forward-looking statements. The outcome of the events described in these forward-looking statements is subject to risks, uncertainties, and other factors, including those described in Part I, Item 1A. Risk Factors in our Annual Report on Form 10-K for our fiscal year ended March 31, 2021, filed with the Securities and Exchange Commission, and elsewhere in this Quarterly Report. These factors may cause our actual results to differ materially from any forward-looking statement. Moreover, we operate in a very competitive and rapidly changing environment. New risks and uncertainties emerge from time to time, and it is not possible for us to predict all risks and uncertainties that could have an impact on the forward-looking statements contained in this Quarterly Report on Form 10-Q. We cannot assure you that the results, events, and circumstances reflected in the forward-looking statements will be achieved or occur, and actual results, events, or circumstances could differ materially from those described in the forward-looking statements.

The forward-looking statements made in this Quarterly Report on Form 10-Q relate only to events as of the date on which the statements are made. We undertake no obligation to update any forward-looking statements made in this Quarterly Report on Form 10-Q to reflect events or circumstances after the date of this Quarterly Report on Form 10-Q or to reflect new information or the occurrence of unanticipated events, except as required by law. We may not actually achieve the plans, intentions, or expectations disclosed in our forward-looking statements and you should not place undue reliance on our forward-looking statements. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures, or investments we may make.

1

PART I: FINANCIAL INFORMATION

Item 1. Unaudited Financial Statements

NetScout Systems, Inc.

Consolidated Balance Sheets

(In thousands, except share data)

	September 30, 2021		March 31, 2021
	(Unaudited)
Assets
Current assets:
Cash and cash equivalents	$	468,470	$	467,176
Marketable securities	7,347		9,277
Accounts receivable and unbilled costs, net of allowance for doubtful accounts of $398 and $416 at September 30, 2021 and March 31, 2021, respectively	162,888		197,717
Inventories and deferred costs	25,728		22,813
Prepaid income taxes	11,526		1,906
Prepaid expenses and other current assets	25,629		23,583
Total current assets	701,588		722,472
Fixed assets, net	45,008		48,474
Operating lease right-of-use assets	56,715		61,512
Goodwill	1,717,870		1,717,554
Intangible assets, net	474,448		511,866
Deferred income taxes	8,064		8,096
Other assets	12,705		15,064
Total assets	$	3,016,398	$	3,085,038
Liabilities and Stockholders' Equity
Current liabilities:
Accounts payable	$	17,644	$	17,964
Accrued compensation	57,783		83,057
Accrued other	31,802		21,127
Income taxes payable	4,840		7,025
Deferred revenue and customer deposits	246,726		269,748
Current portion of operating lease liabilities	11,992		12,354
Total current liabilities	370,787		411,275
Other long-term liabilities	12,315		21,641
Deferred tax liability	85,987		92,287
Accrued long-term retirement benefits	39,704		39,479
Long-term deferred revenue and customer deposits	102,457		103,310
Operating lease liabilities, net of current portion	56,144		61,267
Long-term debt	350,000		350,000
Total liabilities	1,017,394		1,079,259
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock, $0.001 par value:
5,000,000 shares authorized; no shares issued or outstanding at September 30, 2021 and March 31, 2021	—		—
Common stock, $0.001 par value:
300,000,000 shares authorized; 126,108,858 and 124,197,974 shares issued and 74,217,661 and 73,751,615 shares outstanding at September 30, 2021 and March 31, 2021, respectively	126		124
Additional paid-in capital	2,991,704		2,955,400
Accumulated other comprehensive loss	(1,931)		(1,940)
Treasury stock at cost, 51,891,197 and 50,446,359 shares at September 30, 2021 and March 31, 2021, respectively	(1,362,141)		(1,322,496)
Retained earnings	371,246		374,691
Total stockholders' equity	1,999,004		2,005,779
Total liabilities and stockholders' equity	$	3,016,398	$	3,085,038

The accompanying notes are an integral part of these consolidated financial statements.

2

NetScout Systems, Inc.

Consolidated Statements of Operations

(In thousands, except per share data)

(Unaudited)

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Revenue:
Product	$	101,619	$	91,979	$	183,569	$	163,672
Service	110,299		113,360		218,621		225,482
Total revenue	211,918		205,339		402,190		389,154
Cost of revenue:
Product	20,340		26,977		43,505		48,129
Service	31,304		31,923		62,549		63,751
Total cost of revenue	51,644		58,900		106,054		111,880
Gross profit	160,274		146,439		296,136		277,274
Operating expenses:
Research and development	44,483		46,455		87,303		91,836
Sales and marketing	65,185		60,300		131,143		119,734
General and administrative	23,471		20,573		46,216		45,726
Amortization of acquired intangible assets	14,970		15,363		29,976		30,624
Restructuring charges	—		(31)		—		62
Total operating expenses	148,109		142,660		294,638		287,982
Income (loss) from operations	12,165		3,779		1,498		(10,708)
Interest and other expense, net:
Interest income	45		171		109		437
Interest expense	(2,411)		(2,715)		(4,566)		(5,789)
Other income (expense), net	30		(850)		(299)		(2,822)
Total interest and other expense, net	(2,336)		(3,394)		(4,756)		(8,174)
Income (loss) before income tax expense	9,829		385		(3,258)		(18,882)
Income tax expense	1,933		4,071		187		2,224
Net income (loss)	$	7,896	$	(3,686)	$	(3,445)	$	(21,106)
Basic net income (loss) per share	$	0.11	$	(0.05)	$	(0.05)	$	(0.29)
Diluted net income (loss) per share	$	0.11	$	(0.05)	$	(0.05)	$	(0.29)
Weighted average common shares outstanding used in computing:
Net income (loss) per share - basic	74,382		73,058		74,122		72,682
Net income (loss) per share - diluted	75,093		73,058		74,122		72,682

The accompanying notes are an integral part of these consolidated financial statements.

3

NetScout Systems, Inc.

Consolidated Statements of Comprehensive Income (Loss)

(In thousands)

(Unaudited)

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Net income (loss)	$	7,896	$	(3,686)	$	(3,445)	$	(21,106)
Other comprehensive income (loss):
Cumulative translation adjustments	(52)		940		(33)		1,893
Changes in market value of investments:
Changes in unrealized losses, net of tax benefit of $0, ($10), ($2) and ($33), respectively	—		(33)		(5)		(107)
Total net change in market value of investments	—		(33)		(5)		(107)
Changes in market value of derivatives:
Changes in market value of derivatives, net of (benefit) taxes of ($9), $55, $30 and $59, respectively	(33)		181		97		188
Reclassification adjustment for net gains (losses) included in net income (loss), net of taxes (benefit) of $9,($32), ($15) and ($22), respectively	31		(105)		(50)		(72)
Total net change in market value of derivatives	(2)		76		47		116
Other comprehensive income (loss)	(54)		983		9		1,902
Total comprehensive income (loss)	$	7,842	$	(2,703)	$	(3,436)	$	(19,204)

The accompanying notes are an integral part of these consolidated financial statements.

4

NetScout Systems, Inc.

Consolidated Statements of Stockholders' Equity

(In thousands, except share data)

(Unaudited)

	Three Months Ended September 30, 2021
	Common Stock Voting			Additional Paid In Capital		Accumulated Other Comprehensive Income (Loss)		Treasury Stock			Retained Earnings		Total Stockholders' Equity
	Shares	Par Value						Shares	Stated Value
Balance, June 30, 2021	124,694,737	$	124	$	2,968,631	$	(1,877)	50,610,492	$	(1,327,273)	$	363,350	$	2,002,955
Net income											7,896		7,896
Unrealized net loss on derivative financial instruments						(2)							(2)
Cumulative translation adjustments						(52)							(52)
Issuance of common stock pursuant to vesting of restricted stock units	1,162,813	2											2
Stock-based compensation expense for restricted stock units granted to employees				16,183									16,183
Issuance of common stock under employee stock purchase plan	251,308			6,890									6,890
Repurchase of treasury stock								1,280,705	(34,868)				(34,868)
Balance, September 30, 2021	126,108,858	$	126	$	2,991,704	$	(1,931)	51,891,197	$	(1,362,141)	$	371,246	$	1,999,004

	Six Months Ended September 30, 2021
	Common Stock Voting			Additional Paid In Capital		Accumulated Other Comprehensive Income (Loss)		Treasury Stock			Retained Earnings		Total Stockholders' Equity
	Shares	Par Value						Shares	Stated Value
Balance, March 31, 2021	124,197,974	$	124	$	2,955,400	$	(1,940)	50,446,359	$	(1,322,496)	$	374,691	$	2,005,779
Net loss											(3,445)		(3,445)
Unrealized net investment losses						(5)							(5)
Unrealized net gains on derivative financial instruments						47							47
Cumulative translation adjustments						(33)							(33)
Issuance of common stock pursuant to vesting of restricted stock units	1,659,576	2											2
Stock-based compensation expense for restricted stock units granted to employees				29,414									29,414
Issuance of common stock under employee stock purchase plan	251,308			6,890									6,890
Repurchase of treasury stock								1,444,838	(39,645)				(39,645)
Balance, September 30, 2021	126,108,858	$	126	$	2,991,704	$	(1,931)	51,891,197	$	(1,362,141)	$	371,246	$	1,999,004

The accompanying notes are an integral part of these consolidated financial statements.

5

NetScout Systems, Inc.

Consolidated Statements of Stockholders' Equity

(In thousands, except share data)

(Unaudited)

	Three Months Ended September 30, 2020
	Common Stock Voting			Additional Paid In Capital		Accumulated Other Comprehensive Income (Loss)		Treasury Stock			Retained Earnings		Total Stockholders’ Equity
	Shares	Par Value						Shares	Stated Value
Balance, June 30, 2020	122,353,504	$	122	$	2,903,055	$	(2,241)	49,898,334	$	(1,309,038)	$	337,919	$	1,929,817
Net loss											(3,686)		(3,686)
Unrealized net investment losses						(33)							(33)
Unrealized net gains on derivative financial instruments						76							76
Cumulative translation adjustments						940							940
Issuance of common stock pursuant to vesting of restricted stock units	1,207,629	1											1
Stock-based compensation expense for restricted stock units granted to employees				15,227									15,227
Issuance of common stock under employee stock purchase plan	279,812			6,475									6,475
Repurchase of treasury stock								368,576	(9,497)				(9,497)
Balance, September 30, 2020	123,840,945	$	123	$	2,924,757	$	(1,258)	50,266,910	$	(1,318,535)	$	334,233	$	1,939,320

	Six Months Ended September 30, 2020
	Common Stock Voting			Additional Paid In Capital		Accumulated Other Comprehensive Income (Loss)		Treasury Stock			Retained Earnings		Total Stockholders’ Equity
	Shares	Par Value						Shares	Stated Value
Balance, March 31, 2020	122,006,077	$	122	$	2,891,553	$	(3,160)	49,785,171	$	(1,305,935)	$	355,339	$	1,937,919
Net loss											(21,106)		(21,106)
Unrealized net investment losses						(107)							(107)
Unrealized net gains on derivative financial instruments						116							116
Cumulative translation adjustments						1,893							1,893
Issuance of common stock pursuant to vesting of restricted stock units	1,555,056	1											1
Stock-based compensation expense for restricted stock units granted to employees				26,729									26,729
Issuance of common stock under employee stock purchase plan	279,812			6,475									6,475
Repurchase of treasury stock								481,739	(12,600)				(12,600)
Balance, September 30, 2020	123,840,945	$	123	$	2,924,757	$	(1,258)	50,266,910	$	(1,318,535)	$	334,233	$	1,939,320

The accompanying notes are an integral part of these consolidated financial statements.

6

NetScout Systems, Inc.

Consolidated Statements of Cash Flows

(In thousands)

(Unaudited)

	Six Months Ended
	September 30,
	2021		2020
Cash flows from operating activities:
Net loss	$	(3,445)	$	(21,106)
Adjustments to reconcile net loss to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	48,246		53,152
Loss on extinguishment of debt	596		—
Operating lease right-of-use assets	4,904		5,190
Loss on disposal of fixed assets	2		37
Share-based compensation expense	30,700		27,832
Deferred income taxes	(6,270)		(6,624)
Other gains	(10)		—
Changes in assets and liabilities
Accounts receivable and unbilled costs	34,935		44,640
Inventories	(5,481)		(5,472)
Prepaid expenses and other assets	(7,082)		(4,330)
Accounts payable	(313)		(1,339)
Accrued compensation and other expenses	(17,753)		9,484
Operating lease liabilities	(5,591)		(5,168)
Income taxes payable	(2,225)		(171)
Deferred revenue	(23,874)		(39,479)
Net cash provided by operating activities	47,339		56,646
Cash flows from investing activities:
Purchase of marketable securities	(11,343)		(6,780)
Proceeds from sales and maturity of marketable securities	13,266		45,094
Purchase of fixed assets	(4,301)		(5,769)
Purchase of intangible assets	—		(4,537)
Decrease in deposits	26		106
Net cash (used in) provided by investing activities	(2,352)		28,114
Cash flows from financing activities:
Issuance of common stock under stock plans	2		1
Payment of contingent consideration	—		(1,000)
Treasury stock repurchases	(24,413)		—
Tax withholding on restricted stock units	(14,997)		(12,600)
Payment of debt issuance costs	(3,660)		—
Repayment of long-term debt	(350,000)		—
Proceeds from issuance of long-term debt	350,000		—
Net cash used in financing activities	(43,068)		(13,599)
Effect of exchange rate changes on cash and cash equivalents	(625)		5,069
Net increase in cash and cash equivalents and restricted cash	1,294		76,230
Cash and cash equivalents and restricted cash, beginning of period	467,176		340,237
Cash and cash equivalents and restricted cash, end of period	$	468,470	$	416,467
Supplemental disclosures:
Cash paid for interest	$	2,540	$	4,177
Cash paid for income taxes	$	18,963	$	5,377
Non-cash transactions:
Transfers of inventory to fixed assets	$	2,657	$	1,530
Additions to property, plant and equipment included in accounts payable	$	243	$	605
Issuance of common stock under employee stock plans	$	6,890	$	6,475
Unsettled share repurchases, included in accounts payable	$	235	$	—

The accompanying notes are an integral part of these consolidated financial statements.

7

NetScout Systems, Inc.

Notes to Consolidated Financial Statements

(Unaudited)

NOTE 1 – BASIS OF PRESENTATION

The accompanying unaudited interim consolidated financial statements have been prepared by NetScout Systems, Inc. (NetScout or the Company). Certain information and footnote disclosures normally included in financial statements prepared under United States generally accepted accounting principles (GAAP) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). In the opinion of management, the unaudited interim consolidated financial statements include all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of the Company's financial position and stockholders' equity, results of operations and cash flows. The year-end consolidated balance sheet data and statement of stockholders' equity were derived from the Company's audited financial statements, but do not include all disclosures required by GAAP. The results reported in these unaudited interim consolidated financial statements are not necessarily indicative of results that may be expected for the entire year. All significant intercompany accounts and transactions are eliminated in consolidation.

These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements, including the notes thereto, included in the Company's Annual Report on Form 10-K for the fiscal year ended March 31, 2021 filed with the Securities and Exchange Commission on May 20, 2021.

COVID-19 Risks and Uncertainties

The Company is closely monitoring the impact of the COVID-19 pandemic on all aspects of its business. The future impacts of the pandemic and any resulting economic impact on the Company's operations are evolving. It is possible that the COVID-19 pandemic, the measures taken by the governments of countries affected and the resulting economic impact may materially and adversely affect the Company’s results of operations, cash flows and financial position as well as its customers.

Under Accounting Standards Update (ASU) 2014-15, Presentation of Financial Statements—Going Concern (Subtopic 205-40), or ASC 205-40, the Company has the responsibility to evaluate whether conditions and/or events raise substantial doubt about its ability to meet its future financial obligations as they become due within one year after the date that the financial statements are issued. The Company has and continues to take precautionary actions to limit costs and spending across the organization. This includes limiting discretionary spending and hiring activities. In addition, based on covenant levels at September 30, 2021, the Company had, as of September 30, 2021, an incremental $450 million available under the revolving credit facility.

On March 27, 2020, the Coronavirus Aid, Relief and Economic Security Act (the CARES Act) was enacted. The CARES Act, among other things, includes provisions relating to refundable payroll tax credits, deferment of employer social security payments, net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property. The Company has elected to defer the employer-paid portion of social security taxes. As of September 30, 2021, the Company had deferred $8.9 million of employer payroll taxes, of which 50% are required to be deposited by December 2021 and the remaining 50% by December 2022. The balance of $4.5 million was included as accrued other and a balance of $4.4 million was included as other long-term liabilities in the Company's consolidated balance sheet at September 30, 2021.

The Company expects net cash provided by operations combined with cash, cash equivalents, and marketable securities and borrowing availability under the revolving credit facility to provide sufficient liquidity to fund current obligations, capital spending, debt service requirements and working capital requirements over at least the next twelve months.

Recent Accounting Pronouncements

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments provide optional guidance for a limited time to ease the potential burden in accounting for reference rate reform. The new guidance provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts and hedging relationships that reference LIBOR or another reference rate expected to be discontinued due to reference rate reform. In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform, which clarifies the scope and application of certain optional expedients and exceptions regarding the original guidance. ASU 2021-01 may be applied prospectively through December 31, 2022. The expedients and exceptions provided by the amendments do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. The adoption is not expected to have a material impact on the Company's financial position, results of operations, and disclosures.

8

In January 2020, the FASB issued ASU 2020-01, Investments-Equity Securities (Topic 321), Investments-Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) - Clarifying the Interactions between Topic 321, Topic 323, and Topic 815. This guidance addresses accounting for the transition into and out of the equity method and provides clarification of the interaction of rules for equity securities, the equity method of accounting, and forward contracts and purchase options on certain types of securities. This standard is effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2020. The Company adopted the guidance as of April 1, 2021. The adoption did not have a material impact on the Company's consolidated financial statements.

In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes. ASU 2019-12 simplifies the accounting for income taxes, eliminates certain exceptions within ASC 740, Income Taxes, and clarifies certain aspects of the current guidance to promote consistency among reporting entities. ASU 2019-12 is effective for fiscal years beginning after December 15, 2020. The Company adopted the guidance as of April 1, 2021. The adoption did not have a material impact on the Company's consolidated financial statements.

NOTE 2 – REVENUE

Revenue Recognition Policy

The Company exercises judgment and uses estimates in connection with determining the amounts of product and service revenues to be recognized in each accounting period.

The Company derives revenues primarily from the sale of network management tools and security solutions for service provider and enterprise customers, which include hardware, software and service offerings. The Company's product sales consist of software only offerings and offerings which include hardware appliances with embedded software that are essential to providing customers the intended functionality of the solutions.

The Company accounts for revenue once a legally enforceable contract with a customer has been approved by the parties and the related promises to transfer products or services have been identified. A contract is defined by the Company as an arrangement with commercial substance identifying payment terms, each party’s rights and obligations regarding the products or services to be transferred and the amount the Company deems probable of collection. Customer contracts may include promises to transfer multiple products and services to a customer. Determining whether the products and services are considered distinct performance obligations that should be accounted for separately or as one combined performance obligation may require significant judgment. Revenue is recognized when control of the products or services are transferred to the Company's customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for products and services.

Product revenue is typically recognized upon shipment, provided a legally enforceable contract exists, control has passed to the customer, and in the case of software products, when the customer has the rights and ability to access the software, and collection of the related receivable is probable. If any significant obligations to the customer remain post-delivery, typically involving obligations relating to installation and acceptance by the customer, revenue recognition is deferred until such obligations have been fulfilled. The Company's service offerings include installation, integration, extended warranty and maintenance services, post-contract customer support, stand-ready software-as-a-service (SAAS) and other professional services including consulting and training. The Company generally provides software and/or hardware support as part of product sales. Revenue related to the initial bundled software and hardware support is recognized ratably over the support period. In addition, customers can elect to purchase extended support agreements for periods after the initial software/hardware warranty expiration. Support services generally include rights to unspecified upgrades (when and if available), telephone and internet-based support, updates, bug fixes and hardware repair and replacement. Consulting services are recognized upon delivery or completion of performance depending on the terms of the underlying contract. Reimbursements of out-of-pocket expenditures incurred in connection with providing consulting services are included in services revenue, with the offsetting expense recorded in cost of service revenue. Training services include on-site and classroom training. Training revenues are recognized upon delivery of the training.

Generally, the Company's contracts are accounted for individually. However, when contracts are closely interrelated and dependent on each other, it may be necessary to account for two or more contracts as one to reflect the substance of the group of contracts.

Bundled arrangements are concurrent customer purchases of a combination of the Company's product and service offerings that may be delivered at various points in time. The Company allocates the transaction price among the performance obligations in an amount that depicts the relative standalone selling prices (SSP) of each obligation. Judgment is required to determine the SSP for each distinct performance obligation. The Company uses a range of amounts to estimate SSP when it sells each of the products and services separately based on the element’s historical pricing. The Company also considers its overall pricing objectives and practices across different sales channels and geographies, and market conditions. Generally, the Company has established SSP for a majority of its service elements based on historical standalone sales. In certain instances,

9

the Company has established SSP for services based upon an estimate of profitability and the underlying cost to fulfill those services. Further, for certain service engagements, the Company considers quoted prices as part of multi-element arrangements of those engagements as a basis for establishing SSP. SSP has been established for product elements as the average or median selling price the element was recently sold for, whether sold alone or sold as part of a multiple element transaction. The Company reviews sales of the product elements on a quarterly basis and updates, when appropriate, its SSP for such elements to ensure that it reflects recent pricing experience. The Company's products are distributed through its direct sales force and indirect distribution channels through alliances with resellers and distributors. Revenue arrangements with resellers and distributors are recognized on a sell-in basis; that is, when control of the product transfers to the reseller or distributor. The Company records consideration given to a customer as a reduction of revenue to the extent they have recorded revenue from the customer. With limited exceptions, the Company's return policy does not allow product returns for a refund. Returns have been insignificant to date. In addition, the Company has a history of successfully collecting receivables from its resellers and distributors.

During the six months ended September 30, 2021, the Company recognized revenue of $168.4 million related to the Company's deferred revenue balance reported at March 31, 2021.

Performance Obligations

Customer contracts may include promises to transfer multiple products and services to a customer. Determining whether the products and services are considered distinct performance obligations that should be accounted for separately or as one combined performance obligation may require significant judgment. The transaction price is allocated among performance obligations in bundled contracts in an amount that depicts the relative standalone selling prices of each obligation.

For contracts involving distinct hardware and software licenses, the performance obligations are satisfied at a point in time when control is transferred to the customer. For standalone maintenance and post-contract support (PCS) the performance obligation is satisfied ratably over the contract term as a stand-ready obligation. For consulting and training services, the performance obligation may be satisfied over the contract term as a stand-ready obligation, satisfied over a period of time as those services are delivered, or satisfied at the completion of the service when control has transferred, or the services have expired unused.

Payments for hardware, software licenses, one-year maintenance, PCS and consulting services, are typically due up front with payment terms of 30 to 90 days. However, the Company does have contracts pursuant to which billings occur ratably over a period of years following the transfer of control for the contracted performance obligations. Payments on multi-year maintenance, PCS and consulting services are typically due in annual installments over the contract term. The Company did not have any material variable consideration such as obligations for returns, refunds or warranties at September 30, 2021.

At September 30, 2021, the Company had total deferred revenue of $349.2 million, which represents the aggregate total contract price allocated to undelivered performance obligations. The Company expects to recognize $246.7 million, or 71%, of this revenue during the next 12 months, and expects to recognize the remaining $102.5 million, or 29%, of this revenue thereafter.

There are circumstances for which the Company does not recognize revenue relating to sales transactions that have been billed, and the related account receivable has not been collected. While the receivable represents an enforceable obligation, the Company does not believe its right to payment is unconditional, therefore for balance sheet presentation purposes, the Company has not recognized the deferred revenue, or the related account receivable and no amounts appear in the consolidated balance sheets for such transactions because control of the underlying deliverable has not transferred. The aggregate amount of unrecognized accounts receivable and deferred revenue was $8.9 million and $7.1 million at September 30, 2021 and March 31, 2021, respectively.

NetScout expects that the amount of billed and unbilled deferred revenue will change from quarter to quarter for several reasons, including the specific timing, duration and size of large customer support and service agreements, varying billing cycles of such agreements, the specific timing of customer renewals, and foreign currency fluctuations. The Company did not have material significant financing components, or variable consideration or performance obligations satisfied in a prior period recognized during the six months ended September 30, 2021.

Contract Balances

The Company may receive payments from customers based on billing schedules as established by the Company's contracts. Contract assets relate to performance obligations where control has transferred to the customer in advance of scheduled billings. The Company records unbilled accounts receivable representing the right to consideration in exchange for goods or services that have been transferred to a customer conditional on the passage of time. Deferred revenue relates to scenarios where billings occur before all performance obligations are delivered or payments are received in advance of performance under the contract.

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Costs to Obtain Contracts

The Company has determined that the only significant incremental costs incurred to obtain contracts with customers within the scope of Topic 606 are sales commissions paid to its employees. Sales commissions are recorded as an asset and amortized to expense ratably over the remaining performance periods of the related contracts with remaining performance obligations. The Company expenses costs as incurred for sales commissions when the amortization period would have been one year or less.

At September 30, 2021, the consolidated balance sheet included $7.3 million in assets related to sales commissions to be expensed in future periods. A balance of $4.1 million was included in prepaid expenses and other current assets, and a balance of $3.2 million was included in other assets in the Company's consolidated balance sheet at September 30, 2021. At March 31, 2021, the consolidated balance sheet included $7.4 million in assets related to sales commissions to be expensed in future periods. A balance of $4.1 million was included in prepaid expenses and other current assets, and a balance of $3.3 million was included in other assets in the Company's consolidated balance sheet at March 31, 2021.

During the three and six months ended September 30, 2021 and 2020, respectively, the Company recognized $1.5 million, $1.5 million, $3.1 million and $3.1 million of amortization related to this sales commission asset, which is included in the sales and marketing expense line in the Company's consolidated statements of operations.

Allowance for Credit Losses

The Company continually monitors collections from its customers. The Company evaluates the collectability of its accounts receivable and determines the appropriate allowance for credit losses based on a combination of factors, including but not limited to, analysis of the aging schedules, past due balances, historical collection experience and prevailing economic conditions.

The following table summarizes the activity in the allowance for credit losses (in thousands):

Balance at March 31, 2021	$	416
Recoveries and other adjustments	(1)
Write off charged against the allowance for credit losses	(17)
Balance at September 30, 2021	$	398

NOTE 3 – CONCENTRATION OF CREDIT RISK AND SIGNIFICANT CUSTOMERS

Financial instruments that potentially subject the Company to concentration of credit risk consist primarily of investments, trade accounts receivable and accounts payable. The Company's cash, cash equivalents, and marketable securities are placed with financial institutions with high credit standings.

At September 30, 2021, and at March 31, 2021, the Company had one direct customer, Verizon, which accounted for more than 10% of the accounts receivable balance, while no indirect channel partners accounted for more than 10% of the accounts receivable balance.

During the three months ended September 30, 2021, one direct customer, Verizon, accounted for more than 10% of the Company's total revenue, while no indirect channel partners accounted for more than 10% of total revenue. During the six months ended September 30, 2021, no direct customers or channel partners accounted for more than 10% of total revenue. During the three and six months ended September 30, 2020, no direct customers or indirect channel partners accounted for more than 10% of the Company's total revenue.

Historically, the Company has not experienced any significant failure of its customers' ability to meet their payment obligations nor does the Company anticipate material non-performance by its customers in the future; accordingly, the Company does not require collateral from its customers. However, if the Company's assumptions are incorrect, there could be an adverse impact on its allowance for doubtful accounts.

NOTE 4 – SHARE-BASED COMPENSATION

On September 12, 2019, the Company's stockholders approved the 2019 Equity Incentive Plan (2019 Plan), which replaced the Company's 2007 Equity Incentive Plan, as amended (Amended 2007 Plan). The 2019 Plan permitted the granting of incentive and nonstatutory stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, and other stock awards, collectively referred to as "share-based awards." On September 10, 2020, the Company's stockholders approved an amendment and restatement of the 2019 Equity Incentive Plan (the 2019 Amended Plan) to increase the number of shares authorized for issuance by 4,700,000, established a one-year minimum vesting requirement for awards granted on or

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after September 10, 2020, and changed the factor used to calculate the increase or reduction in the number of shares available for issuance under the 2019 Amended Plan.

Periodically, the Company grants share-based awards to employees, officers, and directors of the Company and its subsidiaries. During the six months ended September 30, 2021, the Company granted performance-based restricted stock units to certain executive officers that vest based upon the Company's total shareholder return as compared to the Russell 2000 Index over a three-year period. The performance-based restricted stock units were valued using the Monte Carlo Simulation model. The Company accounts for all share-based awards in accordance with GAAP, which requires the measurement and recognition of compensation expense based on estimated fair values for all share-based payment awards made to its employees and directors. Share-based award grants are generally measured at fair value on the date of grant based on the number of shares granted and the quoted price of the Company's common stock. Such value is recognized as a cost of revenue or an operating expense over the corresponding vesting period.

The following is a summary of share-based compensation expense including restricted stock units and performance-based restricted stock units granted pursuant to the Company's Amended 2007 Plan, the 2019 Plan, and the 2019 Amended Plan and employee stock purchases made under the Company's 2011 Employee Stock Purchase Plan, as amended, (ESPP), based on estimated fair values within the applicable cost and expense lines identified below (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Cost of product revenue	$	321	$	344	$	595	$	589
Cost of service revenue	1,907		1,810		3,520		3,160
Research and development	4,902		4,935		8,993		8,716
Sales and marketing	5,842		5,357		10,656		9,349
General and administrative	3,763		3,290		6,936		6,018
	$	16,735	$	15,736	$	30,700	$	27,832

Employee Stock Purchase Plan – The Company maintains the ESPP for all eligible employees as described in the Company's Annual Report on Form 10-K for the year ended March 31, 2021. Under the ESPP, shares of the Company's common stock may be purchased on the last day of each bi-annual offering period at 85% of the fair value on the last day of such offering period. The offering periods run from March 1st through August 31st and from September 1st through the last day of February each year. During the six months ended September 30, 2021, employees purchased 251,308 shares under the ESPP and the value per share was $23.31.

NOTE 5 – CASH, CASH EQUIVALENTS, RESTRICTED CASH AND MARKETABLE SECURITIES

The 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 mainly consisted of U.S. government and municipal obligations, commercial paper, money market instruments and cash maintained with various financial institutions at September 30, 2021 and March 31, 2021.

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):

	September 30, 2021		March, 31, 2021		September 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

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.

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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 securities	7,347		—		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 paper	5,699		—		5,699
Total short-term marketable securities	9,270		7		9,277
Total long-term marketable securities	—		—		—
Total marketable securities	$	9,270	$	7	$	9,277

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

NOTE 6 – FAIR VALUE MEASUREMENTS

The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value. Level 1 refers to fair values determined based on quoted prices in active markets for identical assets. Level 2 refers to fair values estimated using significant other observable inputs, and Level 3 includes fair values estimated using significant non-observable inputs. The following tables present the Company's financial assets and liabilities measured on a recurring basis using the fair value hierarchy at September 30, 2021 and March 31, 2021 (in thousands):

	Fair Value Measurements at
	September 30, 2021
	Level 1		Level 2		Level 3		Total
ASSETS:
Cash and cash equivalents	$	468,470	$	—	$	—	$	468,470
Commercial paper	—		7,347		—		$	7,347
Derivative financial instruments	—		9		—		9
	$	468,470	$	7,356	$	—	$	475,826
LIABILITIES:
Derivative financial instruments	$	—	$	(32)	$	—	$	(32)
	$	—	$	(32)	$	—	$	(32)

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	Fair Value Measurements at
	March 31, 2021
	Level 1		Level 2		Level 3		Total
ASSETS:
Cash and cash equivalents	$	467,176	$	—	$	—	$	467,176
U.S. government and municipal obligations	2,539		1,039		—		3,578
Commercial paper	—		5,699		—		5,699
Derivative financial instruments	—		57		—		57
	$	469,715	$	6,795	$	—	$	476,510
LIABILITIES:
Derivative financial instruments	$	—	$	(191)	$	—	$	(191)
	$	—	$	(191)	$	—	$	(191)

This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. On a recurring basis, the Company measures certain financial assets and liabilities at fair value, including marketable securities and derivative financial instruments.

The Company's Level 1 investments are classified as such because they are valued using quoted market prices or alternative pricing sources with reasonable levels of price transparency.

The Company's Level 2 investments are classified as such because fair value is calculated using market observable data for similar but not identical instruments, or a discounted cash flow model using the contractual interest rate as compared to the underlying interest yield curve. The Company classifies municipal obligations as Level 2 because the fair values are determined using quoted prices from markets the Company considers to be inactive. Commercial paper is classified as Level 2 because the Company uses market information from similar but not identical instruments and discounted cash flow models based on interest rate yield curves to determine fair value. The Company's derivative financial instruments consist of forward foreign exchange contracts and are classified as Level 2 because the fair values of these derivatives are determined using models based on market observable inputs, including spot prices for foreign currencies and credit derivatives, as well as an interest rate factor.

NOTE 7 – INVENTORIES

Inventories are stated at the lower of actual cost or net realizable value. Cost is determined by using the first in, first out (FIFO) method. Inventories consist of the following (in thousands):

	September 30, 2021		March 31, 2021
Raw materials	$	13,426	$	13,189
Work in process	763		16
Finished goods	6,139		6,168
Deferred costs	5,400		3,440
	$	25,728	$	22,813

NOTE 8 – GOODWILL AND INTANGIBLE ASSETS

Goodwill

The Company has one reporting unit. The Company assesses goodwill for impairment at the reporting unit level at least annually, or on an interim basis if an event occurs or circumstances change that would, more likely than not, reduce the fair value of the reporting unit below its carrying value. The Company completed its annual impairment test on January 31, 2021 using the qualitative Step 0 assessment as the Company concluded that it was more likely than not that the fair value of the reporting unit exceeded its carrying value.

At September 30, 2021 and March 31, 2021, the carrying amount of goodwill was $1.7 billion. The change in the carrying amount of goodwill for the six months ended September 30, 2021 was due to the impact of foreign currency translation adjustments related to asset balances that are recorded in currencies other than the U.S. Dollar.

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The following table summarizes the changes in the carrying amount of goodwill for the six months ended September 30, 2021 as follows (in thousands):

Balance at March 31, 2021	$	1,717,554
Foreign currency translation impact	316
Balance at September 30, 2021	$	1,717,870

Intangible Assets

The net carrying amounts of intangible assets were $474.4 million and $511.9 million at September 30, 2021 and March 31, 2021, respectively. Intangible assets acquired in a business combination are recorded under the acquisition method of accounting at their estimated fair values at the date of acquisition. The Company amortizes acquired intangible assets over their estimated useful lives. During the first quarter of fiscal year 2022, in conjunction with the renewal process of the Company's acquired indefinite-lived trade name and the Company's focus on advancing new product lines, the Company reassessed the estimated economic life of the acquired indefinite-lived trade name. As a result, the Company began amortizing the acquired trade name over 8 years. Prior to reclassifying the acquired trade name to a finite-lived intangible asset, the Company tested the acquired trade name for impairment and determined the fair value of the asset exceeded the carrying value. This change in estimate does not materially impact the Company's income statement.

Intangible assets include the following amortizable intangible assets at September 30, 2021 (in thousands):

	Cost		Accumulated Amortization		Net
Developed technology	$	251,995	$	(219,320)	$	32,675
Customer relationships	775,625		(360,357)		415,268
Distributor relationships and technology licenses	11,465		(8,405)		3,060
Definite-lived trademark and trade name (a)	58,021		(34,825)		23,196
Core technology	7,192		(7,192)		—
Net beneficial leases	336		(336)		—
Non-compete agreements	292		(292)		—
Capitalized software	3,317		(3,303)		14
Other	1,208		(973)		235
	$	1,109,451	$	(635,003)	$	474,448

(a) The Company's $18.6 million acquired trade name changed from indefinite-lived during the first quarter of fiscal year 2022.

Intangible assets include the indefinite-lived trade name with a carrying value of $18.6 million and the following amortizable intangible assets at March 31, 2021 (in thousands):

	Cost		Accumulated Amortization		Net
Developed technology	$	252,071	$	(212,688)	$	39,383
Customer relationships	775,898		(333,903)		441,995
Distributor relationships and technology licenses	11,469		(7,829)		3,640
Definite-lived trademark and trade name	39,434		(31,467)		7,967
Core technology	7,192		(7,192)		—
Net beneficial leases	336		(336)		—
Non-compete agreements	292		(292)		—
Capitalized software	3,317		(3,281)		36
Other	1,208		(963)		245
	$	1,091,217	$	(597,951)	$	493,266

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Amortization included as cost of product revenue consists of amortization of developed technology, distributor relationships and technology licenses, core technology and software. Amortization included as operating expense consists of all other intangible assets. The following table provides a summary of amortization expense for the three and six months ended September 30, 2021 and 2020, respectively (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Amortization of intangible assets included as:
Cost of product revenue	$	3,654	$	5,320	$	7,316	$	10,333
Operating expense	14,975		15,368		29,986		30,634
	$	18,629	$	20,688	$	37,302	$	40,967

The following is the expected future amortization expense at September 30, 2021 for the fiscal years ending March 31 (in thousands):

2022 (remaining six months)	$	37,158
2023	66,701
2024	58,455
2025	51,231
2026	46,878
Thereafter	214,025
	$	474,448

The weighted-average amortization period of developed technology and core technology is 11.2 years. The weighted-average amortization period for customer and distributor relationships is 15.9 years. The weighted-average amortization period for trademarks and trade names is 8.4 years. The weighted-average amortization period for capitalized software is 3.0 years. The weighted-average amortization period for amortizing all intangible assets is 14.6 years.

NOTE 9 – DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

NetScout operates internationally and, in the normal course of business, is exposed to fluctuations in foreign currency exchange rates. The exposures result from costs that are denominated in currencies other than the U.S. Dollar, primarily the Euro, British Pound, Canadian Dollar, and Indian Rupee. The Company manages its foreign cash flow risk by hedging forecasted cash flows for operating expenses denominated in foreign currencies for up to twelve months, within specified guidelines through the use of forward contracts. The Company enters into foreign currency exchange contracts to hedge cash flow exposures from costs that are denominated in currencies other than the U.S. Dollar. These hedges are designated as cash flow hedges at inception.

NetScout also periodically enters into forward contracts to manage exchange rate risks associated with certain third-party transactions and for which the Company does not elect hedge accounting treatment as there is no difference in the timing of gain or loss recognition on the hedging instrument and the hedged item.

All of the Company's derivative instruments are utilized for risk management purposes, and the Company does not use derivatives for speculative trading purposes. These contracts will mature over the next twelve months and are expected to impact earnings on or before maturity.

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The notional amounts and fair values of derivative instruments in the consolidated balance sheets at September 30, 2021 and March 31, 2021 were as follows (in thousands):

	Notional Amounts (a)				Prepaid Expenses and Other Current Assets				Accrued Other
	September 30, 2021		March 31, 2021		September 30, 2021		March 31, 2021		September 30, 2021		March 31, 2021
Derivatives Designated as Hedging Instruments:
Forward contracts	$	1,792	$	11,037	$	9	$	57	$	32	$	152
Derivatives Not Designated as Hedging Instruments:
Forward contracts	—		6,373		—		—		—		39
					$	9	$	57	$	32	$	191

(a) Notional amounts represent the gross contract/notional amount of the derivatives outstanding.

The following table provides the effect foreign exchange forward contracts designated as hedging instruments had on other comprehensive income (loss) (OCI) and results of operations for the three months ended September 30, 2021 and 2020 (in thousands):

	Gain (Loss) Recognized in OCI on Derivative (a)				Gain (Loss) Reclassified from Accumulated OCI into Income (b)
	September 30, 2021		September 30, 2020		Location	September 30, 2021		September 30, 2020
Forward contracts	$	(42)	$	236	Research and development	$	(6)	$	(22)
					Sales and marketing	46		(115)
	$	(42)	$	236		$	40	$	(137)

(a)The amount represents the change in fair value of derivative contracts due to changes in spot rates.

(b)The amount represents reclassification from other comprehensive income to earnings that occurs when the hedged item affects earnings.

The following table provides the effect foreign exchange forward contracts not designated as hedging instruments had on the Company's results of operations for the three months ended September 30, 2021 and 2020 (in thousands):

	Gain Recognized in Income (a)
	Location	September 30, 2021		September 30, 2020
Forward contracts	General and administrative	$	—	$	46
		$	—	$	46

(a)The amount represents the change in fair value of derivative contracts due to changes in spot rates.

The following table provides the effect foreign exchange forward contracts designated as hedging instruments had on other comprehensive income (loss) (OCI) and results of operations for the six months ended September 30, 2021 and 2020 (in thousands):

	Gain Recognized in OCI on Derivative (a)				Loss Reclassified from Accumulated OCI into Income (b)
	September 30, 2021		September 30, 2020		Location	September 30, 2021		September 30, 2020
Forward contracts	$	127	$	247	Research and development	$	(14)	$	(13)
					Sales and marketing	(51)		(81)
	$	127	$	247		$	(65)	$	(94)

(a)The amount represents the change in fair value of derivative contracts due to changes in spot rates.

(b)The amount represents reclassification from other comprehensive income to earnings that occurs when the hedged item affects earnings.

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The following table provides the effect foreign exchange forward contracts not designated as hedging instruments had on the Company's results of operations for the six months ended September 30, 2021 and 2020 (in thousands):

	Gain Recognized in Income (a)
	Location	September 30, 2021		September 30, 2020
Forward contracts	General and administrative	$	—	$	46
		$	—	$	46

(a)The amount represents the change in fair value of derivative contracts due to changes in spot rates.

NOTE 10 – LONG-TERM DEBT

On January 16, 2018, the Company amended and expanded its existing credit agreement (Amended Credit Agreement), which provided for a five-year, $1.0 billion senior secured revolving credit facility, including a letter of credit sub-facility of up to $75.0 million. The commitments under the Amended Credit Agreement were set to expire on January 16, 2023, and any outstanding loans were due on that date.

On July 27, 2021, the Company amended and extended the Amended Credit Agreement (Second Amended and Restated Credit Agreement) with a syndicate of lenders by and among: the Company; JPMorgan Chase Bank, N.A. (JPMorgan), as administrative agent and collateral agent; JPMorgan, Wells Fargo Securities, LLC, BofA Securities Inc., RBC Capital Markets, PNC Capital Markets LLC and Mizuho Bank, Ltd., as joint lead arrangers and joint bookrunners; Santander Bank, N.A., U.S. Bank National Association, Fifth Third Bank National Association, Silicon Valley Bank and TD Bank, N.A., as co-documentation agents; and the lenders party thereto.

The Second Amended and Restated Credit Agreement provides for a five-year, $800.0 million senior secured revolving credit facility, including a letter of credit sub-facility of up to $75.0 million. The Company may elect to use the credit facility for general corporate purposes (including to finance the repurchase of shares of the Company's common stock). The commitments under the Second Amended and Restated Credit Agreement will expire on July 27, 2026, and any outstanding loans will be due on that date.

In connection with the Second Amended and Restated Credit Agreement, the Company paid off the outstanding balance of $350 million under the Amended Credit Agreement on July 27, 2021 by borrowing the same amount under the Second Amended and Restated Credit Agreement. Additionally, the Company recorded a loss on the extinguishment of debt of $0.6 million, representing the write off of unamortized deferred financing costs, which was included in interest expense in the consolidated statements of operations for the three and six months ended September 30, 2021. At September 30, 2021, $350 million was outstanding under the Second Amended and Restated Credit Agreement.

At the Company's election, revolving loans under the Second Amended and Restated Credit Agreement bear interest at either (a) an Alternate Base Rate per annum equal to the greatest of (1) the Wall Street Journal prime rate; (2) the New York Federal Reserve Bank (NYFRB) rate plus 0.50%, or (3) an adjusted one month LIBO rate plus 1%; or (b) a Term Benchmark Borrowing rate (for the interest period selected by the Company, subject to customary provisions regarding succession from LIBO rate to SOF rate in anticipation of the upcoming discontinuation of the LIBO rate), in each case plus an applicable margin. For the initial period until the Company has delivered financial statements for the quarter ended September 30, 2021, the applicable margin will be 1.25% per annum for Term Benchmark Revolving loans and 0.25% per annum for Alternate Base Rate loans, and thereafter the applicable margin will vary depending on the Company's consolidated gross leverage ratio, ranging from 1.00% per annum for Alternate Base Rate loans and 2.00% per annum for Term Benchmark Revolving loans if the Company's consolidated gross leverage ratio is greater than 3.50 to 1.00, down to 0.00% per annum for Alternate Base Rate loans and 1.00% per annum for Term Benchmark Revolving loans if the Company's consolidated gross leverage ratio is equal to or less than 1.50 to 1.00.

The Company's consolidated gross leverage ratio is the ratio of its total funded debt compared to its consolidated EBITDA as defined in the Second Amended and Restated Credit Agreement (adjusted consolidated EBITDA). Adjusted consolidated EBITDA includes certain adjustments, including, without limitation, adjustments relating to extraordinary, unusual or non-recurring charges, certain restructuring charges, non-cash charges, certain transaction costs and expenses and certain pro forma adjustments in connection with material acquisitions and dispositions, all as set forth in detail in the Second Amended and Restated Credit Agreement. The Company's secured net leverage ratio is the ratio of its Consolidated Total Debt minus the lesser of unrestricted cash and 125% of adjusted consolidated EBITDA compared to its adjusted consolidated EBITDA.

Commitment fees will accrue on the daily unused amount of the credit facility. For the initial period until the Company has delivered financial statements for the quarter ended September 30, 2021, the commitment fee will be 0.20% per annum, and

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thereafter the commitment fee will vary depending on the Company's consolidated gross leverage ratio, ranging from 0.30% per annum if the Company's consolidated gross leverage ratio is greater than 2.75 to 1.00, down to 0.15% per annum if the Company's consolidated gross leverage ratio is equal to or less than 1.50 to 1.00.

Letter of credit participation fees are payable to each lender providing the letter of credit sub-facility on the amount of such lender's letter of credit exposure, during the period from the closing date of the Second Amended and Restated Credit Agreement to, but excluding, the date which is the later of (i) the date on which such lender's commitment terminates or (ii) the date on which such lender ceases to have any letter of credit exposure, at the applicable rate that would be used to determine the interest rate applicable to Term Benchmark Revolving loans assuming such loans were outstanding during the period. Additionally, the Company will pay a fronting fee to each issuing bank in amounts to be agreed to between the Company and the applicable issuing bank.

Interest on Alternate Base Rate loans is payable at the end of each calendar quarter. Interest on Term Benchmark Revolving loans is payable at the end of each interest rate period or at the end of each three-month interval within an interest rate period if the period is longer than three months. The Company may also prepay loans under the Second Amended and Restated Credit Agreement at any time, without penalty, subject to certain notice requirements.

The loans and other obligations under the credit facility are (a) guaranteed by each of the Company’s wholly-owned material domestic restricted subsidiaries, subject to certain exceptions, and (b) are secured by substantially all of the assets of the Company and the subsidiary guarantors, including a pledge of all the capital stock of material subsidiaries held directly by the Borrower and the subsidiary guarantors (which pledge, in the case of any foreign subsidiary, is limited to 65% of the voting stock), subject to certain customary exceptions and limitations. The Second Amended and Restated Credit Agreement generally prohibits any other liens on the assets of the Company and its restricted subsidiaries, subject to certain exceptions as described in the Second Amended and Restated Credit Agreement.

The Second Amended and Restated Credit Agreement contains certain covenants applicable to the Company and its restricted subsidiaries, including, without limitation, limitations on additional indebtedness, liens, various fundamental changes, dividends and distributions, investments (including acquisitions), transactions with affiliates, asset sales, including sale-leaseback transactions, speculative hedge agreements, payment of junior financing, changes in business and other limitations customary in senior secured credit facilities. The Second Amended and Restated Credit Agreement requires the Company to maintain a certain consolidated net leverage ratio and removes the previous requirement under the Amended Credit Agreement that the Company maintain a minimum consolidated interest coverage ratio. These covenants and limitations are more fully described in the Second Amended and Restated Credit Agreement. As of September 30, 2021, the Company was in compliance with the specified total consolidated net leverage ratio range of 4.00 to 1.00.

The Second Amended and Restated Credit Agreement provides that events of default will exist in certain circumstances, including failure to make payment of principal or interest on the loans when required, failure to perform certain obligations under the Second Amended and Restated Credit Agreement and related documents including a failure to meet the maximum total consolidated net leverage ratio covenant, defaults under certain other indebtedness, certain insolvency events, certain events arising under ERISA, a change of control and certain other events. Upon an event of default, the administrative agent with the consent of, or at the request of, the holders of more than 50% in principal amount of the loans and commitments, may terminate the commitments and accelerate the maturity of the loans and enforce certain other remedies under the Second Amended and Restated Credit Agreement and the other loan documents.

The Company had unamortized capitalized debt issuance costs, net of $5.5 million at September 30, 2021, which are being amortized over the life of the revolving credit facility. The unamortized capitalized debt issuance costs balance of $1.1 million was included as prepaid expenses and other current assets and a balance of $4.4 million was included as other assets in the Company's consolidated balance sheet.

NOTE 11 - LEASES

The Company determines if an arrangement is a lease at inception. Right-of-use (ROU) assets represent the Company's right to use an underlying asset for the duration of the lease term. Lease liabilities represent the Company's contractual obligation to make lease payments over the lease term. ROU assets are recorded and recognized at commencement for the lease liability amount, plus initial direct costs incurred less lease incentives received. Lease liabilities are recorded at the present value of future lease payments over the lease term at commencement. The discount rate used is generally the Company's estimated incremental borrowing rate unless the lessor's implicit rate is readily determinable. Incremental borrowing rates are calculated periodically to estimate the rate the Company would pay to borrow the funds necessary to obtain an asset of similar value over a similar term. Lease expenses relating to operating leases are recognized on a straight-line basis over the lease term.

The Company has operating leases for administrative, research and development, sales and marketing and manufacturing facilities and equipment under various non-cancelable lease agreements. The Company's leases have remaining lease terms ranging from 1 year to 9 years. The Company's lease terms may include options to extend or terminate the lease where it is reasonably certain that the Company will exercise those options. The Company considers several economic factors when

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making this determination, including but not limited to, the significance of leasehold improvements incurred in the office space, the difficulty in replacing the asset, underlying contractual obligations, or specific characteristics unique to a particular lease. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants.

Most of the Company's lease agreements contain variable payments, primarily for common area maintenance (CAM), which are expensed as incurred and not included in the measurement of the ROU assets and lease liabilities.

The components of operating lease cost for the three and six months ended September 30, 2021 and 2020 were as follows (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Lease cost under long-term operating leases	$	3,197	$	3,263	$	6,472	$	6,525
Lease cost under short-term operating leases	1,183		1,567		1,743		2,380
Variable lease cost under short-term and long-term operating leases	750		1,068		1,583		1,950
Total operating lease cost	$	5,130	$	5,898	$	9,798	$	10,855

The table below presents supplemental cash flow information related to leases during the six months ended September 30, 2021 and 2020 (in thousands):

	September 30, 2021		September 30, 2020
Right-of-use assets obtained in exchange for new operating lease liabilities	$	113	$	1,794

At September 30, 2021 and March 31, 2021, the weighted average remaining lease term in years and weighted average discount rate were as follows:

	September 30, 2021		March 31, 2021
Weighted average remaining lease term in years - operating leases	7.37		7.70
Weighted average discount rate - operating leases	4.1	%	4.1	%

Future minimum payments under non-cancellable leases at September 30, 2021 are as follows (in thousands):

Year ending March 31:
2022 (remaining six months)	$	6,654
2023	13,190
2024	10,549
2025	10,096
2026	9,086
Thereafter	29,285
Total lease payments	$	78,860
Less imputed interest	(10,724)
Present value of lease liabilities	$	68,136

NOTE 12 – COMMITMENTS AND CONTINGENCIES

From time to time, NetScout is subject to legal proceedings and claims in the ordinary course of business. In the opinion of management, the amount of ultimate expense with respect to any current legal proceedings and claims, if determined adversely, will not have a material adverse effect on the Company's financial condition, results of operations or cash flows.

As previously disclosed, in March 2016, Packet Intelligence LLC (Packet Intelligence or Plaintiff) filed a Complaint against NetScout and two subsidiary entities in the United States District Court for the Eastern District of Texas asserting infringement of five United States patents. Plaintiff's Complaint alleged that legacy Tektronix GeoProbe products, including the G10 and GeoBlade products, infringed these patents. NetScout filed an Answer denying Plaintiff's allegations and asserting that Plaintiff's patents were, among other things, invalid, not infringed, and unenforceable due to inequitable conduct. In October

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2017, a jury trial was held to address the parties' claims and counterclaims regarding infringement of three patents by the G10 and GeoBlade products, invalidity of these patents, and damages. On October 13, 2017, the jury rendered a verdict finding in favor of the Plaintiff and that Plaintiff was entitled to $3,500,000 for pre-suit damages and $2,250,000 for post-suit damages. The jury indicated that the awarded damages amounts were intended to reflect a running royalty. In September 2018, the Court entered judgment and "enhanced" the jury verdict in the amount of $2.8 million as a result of a jury finding. The judgment also awarded pre- and post-judgment interest, and a running royalty on the G10 and GeoBlade products until the expiration of the patents at issue, the last date being June 2022. Following the entry of final judgment, on June 12, 2019, NetScout filed its Notice of Appeal. On July 14, 2020, the Court of Appeals for the Federal Circuit issued a decision vacating the $3,500,000 pre-suit damages award, affirming the $2,250,000 post-suit damages award, and remanding to the district court to determine what, if any, enhancement should be awarded. On March 15, 2021, NetScout filed a petition for a writ of certiorari to the United States Supreme Court, which was subsequently denied, challenging, among other issues, the basis for enhanced damages and the patentability of the claimed technology. The case is currently on remand at the District Court for additional proceedings, including pending motions relating to whether enhanced damages should be awarded and the ongoing royalty rate. In addition, on September 8 and 9, 2021, in proceedings initiated by third parties that did not involve NetScout, the Patent Trial and Appeal Board (PTAB) invalidated all the patent claims that were also asserted against NetScout in this case. After the PTAB decisions were issued, NetScout moved to dismiss the case and enter judgment in its favor on the grounds that the PTAB decisions invalidating the asserted claims precluded Plaintiff from continuing to assert its patent infringement causes of action and from seeking damages from NetScout. Plaintiff has opposed the requested relief and is seeking review of the PTAB decisions. To date, there has been no decision from the United States Patent and Trademark Office Director regarding these decisions, and no appeal of them has been initiated with the Federal Circuit. In view of the current circumstances, NetScout has concluded that the risk of loss associated with the post-suit damages award remains "probable" in accounting terms, regardless of the options NetScout may pursue, and that the risk of loss associated with pre-suit damages is remote. Accounting rules require NetScout to provide an estimate for the range of potential liability. If the post-suit damages award survives the recent PTAB invalidation decisions, NetScout currently estimates that the range of liability would be the sum of post-suit damages, plus pre- and post-judgment interest amounts and royalties owed on post-trial sales of the accused G10 and GeoBlade products. Any potential enhancement of any such surviving post-suit damages award is not reasonably estimable but is likely within the range of $0 to $2,800,000.

NOTE 13 – PENSION BENEFIT PLANS

Certain of the Company's non-U.S. employees participate in noncontributory defined benefit pension plans. None of the Company's employees in the U.S. participate in any noncontributory defined benefit pension plans. In general, these plans are funded based on considerations relating to legal requirements, underlying asset returns, the plan's funded status, the anticipated deductibility of the contribution, local practices, market conditions, interest rates and other factors.

The following sets forth the components of the Company's net periodic pension cost of the noncontributory defined benefit pension plans for the three and six months ended September 30, 2021 and 2020 (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Service cost	$	44	$	52	$	88	$	104
Interest cost	88		93		180		186
Net periodic pension cost	$	132	$	145	$	268	$	290

Expected Contributions

During the six months ended September 30, 2021, the Company made contributions of $0.2 million to its defined benefit pension plans. During the fiscal year ending March 31, 2022, the Company's cash contribution requirements for its defined benefit pension plans are expected to be less than $1.0 million. As a majority of the participants within the Company's plans are all active employees, the benefit payments are not expected to be material in the foreseeable future.

NOTE 14 – TREASURY STOCK

On October 24, 2017, the Company's Board of Directors approved a share repurchase program that enables the Company to repurchase up to twenty-five million shares of its common stock. This program became effective when the Company's previously disclosed twenty million share repurchase program was completed. The Company is not obligated to acquire any specific amount of common stock within any particular timeframe as a result of this share repurchase program. 

Through September 30, 2021, the Company repurchased 18,832,139 shares for $496.6 million in the open market under the twenty-five million share repurchase program. At September 30, 2021, 6,167,861 shares of common stock remained

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available to be purchased under the current repurchase program. The Company repurchased 921,299 shares for $24.6 million under the twenty-five million share repurchase program during the six months ended September 30, 2021. There were no share repurchases during the six months ended September 30, 2020.

In connection with the delivery of shares of the Company's common stock upon vesting of restricted stock units, the Company withheld 523,539 shares and 481,739 shares at a cost of $15.0 million and $12.6 million, respectively, related to minimum statutory tax withholding requirements on these restricted stock units during the six months ended September 30, 2021 and 2020, respectively. These withholding transactions do not fall under the repurchase program described above, and therefore do not reduce the number of shares that are available for repurchase under that program.

NOTE 15 – NET INCOME (LOSS) PER SHARE

Calculations of the basic and diluted net income (loss) per share and potential common shares are as follows (in thousands, except for per share data):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Numerator:
Net income (loss)	$	7,896	$	(3,686)	$	(3,445)	$	(21,106)
Denominator:
Denominator for basic net income (loss) per share - weighted average common shares outstanding	74,382		73,058		74,122		72,682
Dilutive common equivalent shares:
Weighted average restricted stock units and performance-based restricted stock units	711		—		—		—
Denominator for diluted net income (loss) per share - weighted average shares outstanding	75,093		73,058		74,122		72,682
Net income (loss) per share:
Basic net income (loss) per share	$	0.11	$	(0.05)	$	(0.05)	$	(0.29)
Diluted net income (loss) per share	$	0.11	$	(0.05)	$	(0.05)	$	(0.29)

The following table sets forth restricted stock units excluded from the calculation of diluted net income (loss) per share, since their inclusion would be anti-dilutive (in thousands):

	Three Months Ended		Six Months Ended
	September 30,		September 30,
	2021	2020	2021	2020
Restricted stock units	1,845	536	990	839

Basic net income (loss) per share is calculated by dividing net income (loss) by the weighted average number of shares outstanding during the period. Unvested restricted shares, although legally issued and outstanding, are not considered outstanding for purposes of calculating basic earnings per share. Diluted net income (loss) per share is calculated by dividing net income (loss) by the weighted average number of shares outstanding plus the dilutive effect, if any, of outstanding stock options, restricted shares and restricted stock units using the treasury stock method. The calculation of the dilutive effect of outstanding equity awards under the treasury stock method includes consideration of proceeds from the assumed exercise of stock options and unrecognized compensation expense as additional proceeds. As the Company incurred a net loss during the three months ended September 30, 2020 and during the six months ended September 30, 2021 and 2020, all outstanding restricted stock units and performance-based restricted stock units have an anti-dilutive effect and are therefore excluded from the computation of diluted weighted average shares outstanding.

NOTE 16 – INCOME TAXES

Generally, the Company's effective tax rate differs from the statutory tax rate primarily due to foreign withholding taxes, valuation allowances and US taxation on foreign earnings, which are partially offset by research and development tax credits, foreign tax credits and the foreign derived intangible income deduction.

The Company's effective tax rates were 19.7% and 1,057.4% for the three months ended September 30, 2021 and 2020, respectively. The effective tax rate for the three months ended September 30, 2021 differed from the effective tax rate for the three months ended September 30, 2020, primarily due to the impact of research and development tax credits, foreign tax

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credits, the foreign derived intangible income deduction, foreign withholding taxes, and U.S. taxation on foreign earnings relative to forecasted profits, partially offset by discrete non-deductible stock compensation and the remeasurement of certain deferred taxes due to a change in enacted tax rate in the UK.

The Company's effective tax rates were 5.7% and 11.8% for the six months ended September 30, 2021 and 2020, respectively. The effective tax rate for the six months ended September 30, 2021 differed from the effective tax rate for the six months ended September 30, 2020, primarily due to the impact of research and development tax credits, foreign tax credits, the foreign derived intangible income deduction, foreign withholding taxes, and U.S. taxation on foreign earnings relative to forecasted profits, partially offset by discrete non-deductible stock compensation.

NOTE 17 – SEGMENT AND GEOGRAPHIC INFORMATION

The Company reports revenues and income under one reportable segment.

The Company manages its business in the following geographic areas: United States, Europe, Asia and the rest of the world. The Company's policies mandate compliance with economic sanctions and the export controls.

Total revenue by geography is as follows (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
United States	$	133,662	$	120,027	$	236,555	$	227,350
Europe	34,536		37,990		73,092		72,748
Asia	15,000		13,878		32,316		27,574
Rest of the world	28,720		33,444		60,227		61,482
	$	211,918	$	205,339	$	402,190	$	389,154

The United States revenue includes sales to resellers in the United States. These resellers fulfill customer orders and may subsequently ship the Company's products to international locations. Further, the Company determines the geography of its sales after considering where the contract originated. A majority of revenue attributable to locations outside of the United States is a result of export sales. Substantially all of the Company's identifiable assets are located in the United States.

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Item 2.  Management's Discussion and Analysis of Financial Condition and Results of Operations

You should read the following discussion and analysis of our financial condition and results of operations in conjunction with the condensed consolidated financial statements and notes thereto included elsewhere in this Quarterly Report and in our Annual Report on Form 10-K for the fiscal year ended March 31, 2021, filed with the Securities and Exchange Commission. This discussion contains forward-looking statements that involve risks and uncertainties. When reviewing the discussion below, you should keep in mind the substantial risks and uncertainties that could impact our business. In particular, we encourage you to review the risks and uncertainties described in Part I, Item 1A "Risk Factors" in our Annual Report on Form 10-K for the fiscal year ended March 31, 2021. These risks and uncertainties could cause actual results to differ significantly from those projected in forward-looking statements contained in this report or implied by past results and trends. Forward-looking statements are statements that attempt to forecast or anticipate future developments in our business, financial condition or results of operations. See the section titled "Cautionary Statement Concerning Forward-Looking Statements" that appears at the beginning of this Quarterly Report. These statements, like all statements in this report, speak only as of the date of this Quarterly Report (unless another date is indicated), and, except as required by law, we undertake no obligation to update or revise these statements in light of future developments.

Overview

We are an industry leader with over 35 years of experience in providing service assurance and cybersecurity solutions that are used by customers worldwide to protect their digital business services against disruption. Service providers and enterprises, including local, state and federal government agencies, rely on our solutions to achieve the visibility necessary to optimize network performance, ensure the delivery of high-quality, mission-critical applications and services, gain timely insight into the end user experience and protect their networks from attack. With our offerings, customers can quickly, efficiently and effectively identify and resolve issues that result in downtime, interruptions to services, poor service quality or compromised data, thereby reducing meantime-to-resolution of issues and driving compelling returns on their investments in their networks and broader technology initiatives. Some of the more significant technology trends and catalysts for our business include the evolution of customers' digital transformation initiatives such as the migration to cloud environments, the rapidly expanding cybersecurity threat landscape, business intelligence and analytics advancements, and the 5G evolution in both the service provider and enterprise customer verticals.

Our operating results are influenced by a number of factors, including, but not limited to, the mix and quantity of products and services sold, pricing, costs of materials used in our products, growth in employee-related costs, including commissions, and the expansion of our operations. Factors that affect our ability to maximize our operating results include, but are not limited to, our ability to introduce and enhance existing products, the marketplace acceptance of those new or enhanced products, continued expansion into international markets, development of strategic partnerships, competition, successful acquisition integration efforts, and our ability to control costs and make improvements in a highly competitive industry.

COVID-19 Impact

In March 2020, the World Health Organization declared the novel strain of coronavirus (COVID-19) a global pandemic and recommended containment and mitigation measures worldwide. The pandemic and these containment and mitigation measures have led to adverse impacts on the U.S. and global economies. While we have begun a phased reopening at some of our facilities, we remain focused on protecting the health and well-being of our employees and continue to maintain work from home policies for a vast majority of our employees where feasible.

The extent of the impact of the COVID-19 pandemic on our operational and financial performance will depend on certain developments, including the duration of the pandemic, its impact on our customers and suppliers and the range of governmental and community reactions to the pandemic, which continue to evolve and cannot be fully predicted at this time. We will continue to proactively respond to the situation and may take further actions that could alter our business operations if required by governmental authorities, or that we determine are in the best interests of our stakeholders.

We continue to closely monitor the impact of the COVID-19 pandemic on all aspects of our business, including how it has impacted and could continue to impact our customers, employees, supply chain, and distribution network. During fiscal year 2021, the COVID-19 pandemic and resulting challenging macro-economic environment caused elongated purchasing cycles that impacted our revenue. However, the revenue impact was offset by a reduction in our operating expenses as a result of our cost control measures and COVID-19 related restrictions on travel and events. For fiscal year 2022, as people in the world get immunized and start to return to "normal", we expect that technology and project spending will resume and we will be focused on advancing our products, growing revenue, enhancing earnings per share, and generating free cash flow.

We believe our current cash reserves and access to capital through our revolving credit facility leaves us well-positioned to manage our business as the crisis continues and as a recovery eventually occurs. We expect net cash provided by operations combined with cash, cash equivalents and marketable securities and borrowing availability under our revolving credit facility to

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provide sufficient liquidity to fund current obligations, capital spending, debt service requirements and working capital requirements over at least the next twelve months. We continue to take actions to control costs and increase productivity throughout our company but will invest in areas that advance our business for the future, as necessary. In addition to our cash equivalents, based on covenant levels at September 30, 2021, we had, as of September 30, 2021, an incremental $450 million available to us under our revolving credit facility.

On March 27, 2020, the Coronavirus Aid, Relief and Economic Security Act (the CARES Act) was enacted. The CARES Act, among other things, includes provisions relating to refundable payroll tax credits, deferment of employer social security payments, net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property. We have elected to defer the employer-paid portion of social security taxes. As of September 30, 2021, we had deferred $8.9 million of employer payroll taxes, of which 50% are required to be deposited by December 2021 and the remaining 50% by December 2022.

Results Overview

Total revenue for the six months ended September 30, 2021 as compared to total revenue for the six months ended September 30, 2020 increased due to an increase in revenue from the product portion of our network performance management offerings in both the service provider and enterprise verticals, partially offset by a decrease in product revenue from our DDoS offerings, and the service portion of our network performance management offerings.

Our gross profit percentage increased by three percentage points to 74% during the six months ended September 30, 2021 as compared with the six months ended September 30, 2020.

Net loss for the six months ended September 30, 2021 was $3.4 million, as compared with a net loss for the six months ended September 30, 2020 of $21.1 million, a decrease of $17.7 million. The decrease in net loss was primarily due to a $13.0 million increase in revenue, a $6.4 million decrease in costs to deliver model calibration products, a $3.6 million decrease in amortization of intangible assets, a $2.5 million decrease in foreign exchange expense, a $2.0 million decrease in income tax expense, a $1.2 million decrease in interest expense, a $1.0 million decrease in depreciation expense, and a $0.7 million decrease in cost of materials used to support customers under service contracts. These decreases in net loss were partially offset by a $3.5 million increase in obsolescence charges, a $2.2 million increase in expenses related to trade shows, user conferences and other events, a $2.0 million increase in advertising expense, a $2.0 million increase in contractor fees, a $1.5 million increase in direct material costs, a $0.7 million increase in commissions expense, a $0.7 million increase in travel expenses attributable to the lifting of some COVID-19 related restrictions, and a $0.7 million increase in software maintenance.

At September 30, 2021, we had cash, cash equivalents and marketable securities (current and non-current) of $475.8 million. This represents a decrease of $0.7 million from $476.5 million at March 31, 2021. This decrease was primarily due to $24.4 million used in treasury stock repurchases, $15.0 million used for tax withholdings on restricted stock units, $4.3 million used for capital expenditures, and $3.7 million used for the payment of debt issuance costs, partially offset by $47.3 million in cash provided by operating activities during the six months ended September 30, 2021.

Use of Non-GAAP Financial Measures

We supplement the United States generally accepted accounting principles (GAAP) financial measures we report in quarterly and annual earnings announcements, investor presentations and other investor communications by reporting the following non-GAAP measures: non-GAAP revenue, non-GAAP gross profit, non-GAAP income from operations, non-GAAP net income, non-GAAP net income per share (diluted) and non-GAAP earnings before interest and other expense, income taxes, depreciation, amortization, and (EBITDA) from operations. Non-GAAP revenue eliminates the GAAP effects of acquisitions by adding back revenue related to deferred revenue revaluation. Non-GAAP gross profit includes the aforementioned revenue adjustments and also removes expenses related to the amortization of acquired intangible assets, share-based compensation, and acquisition-related depreciation. Non-GAAP income from operations includes the aforementioned adjustments and also removes business development and integration expense, compensation for post-combination services, legal expenses related to a civil judgment, restructuring charges, and transitional service agreement expenses. Non-GAAP net income includes the foregoing adjustments related to non-GAAP income from operations, and also removes loss on extinguishment of debt, net of related income tax effects. Non-GAAP EBITDA from operations includes the aforementioned items related to non-GAAP income from operations and also removes non-acquisition related depreciation expense.

These non-GAAP measures are not in accordance with GAAP, should not be considered an alternative for measures prepared in accordance with GAAP (revenue, gross profit, operating margin, net income and diluted net income per share), and may have limitations because they do not reflect all our results of operations as determined in accordance with GAAP. These non-GAAP measures should only be used to evaluate our results of operations in conjunction with the corresponding GAAP

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measures. The presentation of non-GAAP information is not meant to be considered superior to, in isolation from, or as a substitute for results prepared in accordance with GAAP.

Management believes these non-GAAP financial measures will enhance the reader's overall understanding of our current financial performance and our prospects for the future by providing a higher degree of transparency for certain financial measures and providing a level of disclosure that helps investors understand how we plan and measure our business. We believe that providing these non-GAAP measures affords investors a view of our operating results that may be more easily compared to peer companies and also enables investors to consider our operating results on both a GAAP and non-GAAP basis during and following the integration period of our acquisitions. Presenting the GAAP measures on their own may not be indicative of our core operating results. Furthermore, management believes that the presentation of non-GAAP measures when shown in conjunction with the corresponding GAAP measures provides useful information to management and investors regarding present and future business trends relating to our financial condition and results of operations.

The following table reconciles revenue, gross profit, income (loss) from operations, net income (loss) and net income (loss) per share on a GAAP and non-GAAP basis for the six months ended September 30, 2021 and 2020 (in thousands, except for per share amounts):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
GAAP revenue	$	211,918	$	205,339	$	402,190	$	389,154
Service deferred revenue fair value adjustment	—		1		—		3
Non-GAAP revenue	$	211,918	$	205,340	$	402,190	$	389,157
GAAP gross profit	$	160,274	$	146,439	$	296,136	$	277,274
Service deferred revenue fair value adjustment	—		1		—		3
Share-based compensation expense	2,228		2,154		4,115		3,749
Amortization of acquired intangible assets	3,352		4,765		6,712		9,500
Acquisition related depreciation expense	7		5		12		11
Non-GAAP gross profit	$	165,861	$	153,364	$	306,975	$	290,537
GAAP income (loss) from operations	$	12,165	$	3,779	$	1,498	$	(10,708)
Service deferred revenue fair value adjustment	—		1		—		3
Share-based compensation expense	16,735		15,736		30,700		27,832
Amortization of acquired intangible assets	18,322		20,128		36,688		40,124
Business development and integration expense	—		—		(5)		16
Compensation for post-combination services	—		63		2		127
Restructuring charges	—		(31)		—		62
Acquisition related depreciation expense	64		60		124		121
Transitional service agreement expense	59		101		117		101
Legal judgments expense	—		—		—		2,804
Non-GAAP income from operations	$	47,345	$	39,837	$	69,124	$	60,482

26

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
GAAP net income (loss)	$	7,896	$	(3,686)	$	(3,445)	$	(21,106)
Service deferred revenue fair value adjustment	—		1		—		3
Share-based compensation expense	16,735		15,736		30,700		27,832
Amortization of acquired intangible assets	18,322		20,128		36,688		40,124
Business development and integration expense	—		—		(5)		16
Compensation for post-combination services	—		63		2		127
Restructuring charges	—		(31)		—		62
Acquisition-related depreciation expense	64		60		124		121
Loss on extinguishment of debt	596		—		596		—
Legal judgments expense	—		—		—		2,804
Income tax adjustments	(8,315)		(4,027)		(14,404)		(9,523)
Non-GAAP net income	$	35,298	$	28,244	$	50,256	$	40,460
GAAP diluted net income (loss) per share	$	0.11	$	(0.05)	$	(0.05)	$	(0.29)
Per share impact of non-GAAP adjustments identified above	0.36		0.43		0.72		0.84
Non-GAAP diluted net income per share	$	0.47	$	0.38	$	0.67	$	0.55
GAAP income (loss) from operations	$	12,165	$	3,779	$	1,498	$	(10,708)
Previous adjustments to determine non-GAAP income from operations	35,180		36,058		67,626		71,190
Non-GAAP income from operations	47,345		39,837		69,124		60,482
Depreciation excluding acquisition related	5,623		6,955		11,434		12,907
Non-GAAP EBITDA from operations	$	52,968	$	46,792	$	80,558	$	73,389

Critical Accounting Policies

 Our discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with GAAP consistently applied. The preparation of these consolidated financial statements requires us to make significant estimates and judgments that affect the amounts reported in our consolidated financial statements and the accompanying notes. These items are regularly monitored and analyzed by management for changes in facts and circumstances, and material changes in these estimates could occur in the future. Changes in estimates are recorded in the period in which they become known. We base our estimates on historical experience and various other assumptions that we believe to be reasonable under the circumstances. Actual results may differ from our estimates.

While all of our accounting policies impact the consolidated financial statements, certain policies are viewed to be critical. Critical accounting policies are those that are both most important to the portrayal of our financial condition and results of operations and that require management's most subjective or complex judgments and estimates. We consider the following accounting policies to be critical in fully understanding and evaluating our financial results:

•revenue recognition;

•share-based compensation;

•valuation of goodwill, intangible assets and other acquisition accounting items; and

•marketable securities.

Please refer to the critical accounting policies set forth in our Annual Report on Form 10-K for the fiscal year ended March 31, 2021, filed with the Securities and Exchange Commission (SEC) on May 20, 2021, for a description of all of our critical accounting policies.

27

Three Months Ended September 30, 2021 and 2020

Revenue

Product revenue consists of sales of our hardware products and licensing of our software products. Service revenue consists of customer support agreements, consulting, training and stand-ready software as a service offering. During the three months ended September 30, 2021, one direct customer, Verizon, accounted for more than 10% of revenue, while no indirect channel partners accounted for more than 10% of our total revenue. During the three months ended September 30, 2020, no direct customer or indirect channel partner accounted for more than 10% of our total revenue.

	Three Months Ended								Change
	September 30,
	(Dollars in Thousands)
	2021				2020
			% of Revenue				% of Revenue		$		%
Revenue:
Product	$	101,619	48	%	$	91,979	45	%	$	9,640	10	%
Service	110,299		52		113,360		55		(3,061)		(3)	%
Total revenue	$	211,918	100	%	$	205,339	100	%	$	6,579	3	%

Product. The 10%, or $9.6 million, increase in product revenue compared with the same period last year was primarily due to an increase in revenue from network performance management offerings for enterprise and service provider customers, partially offset by a decrease in revenue from distributed denial of service (DDoS) offerings.

Service. The 3%, or $3.1 million, decrease in service revenue compared to the same period last year was primarily driven by non-renewals associated with service provider consolidation, discontinued product lines, and the timing of renewal bookings.

Total revenue by geography was as follows:

	Three Months Ended								Change
	September 30,
	(Dollars in Thousands)
	2021				2020
			% of Revenue				% of Revenue		$		%
United States	$	133,662	63	%	$	120,027	58	%	$	13,635	11	%
International:
Europe	34,536		16		37,990		19		(3,454)		(9)	%
Asia	15,000		7		13,878		7		1,122		8	%
Rest of the world	28,720		14		33,444		16		(4,724)		(14)	%
Subtotal international	78,256		37		85,312		42		(7,056)		(8)	%
Total revenue	$	211,918	100	%	$	205,339	100	%	$	6,579	3	%

United States revenue increased 11%, or $13.6 million, primarily due to an increase in revenue from network performance management offerings for enterprise and service provider customers, partially offset by a decrease in revenue from DDoS offerings. The 8%, or $7.1 million, decrease in international revenue compared with the same period last year was primarily driven by lower revenue from network performance management offerings for service provider customers.

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Cost of Revenue and Gross Profit

Cost of product revenue consists primarily of material components, manufacturing personnel expenses, packaging materials, overhead and amortization of capitalized software, acquired developed technology and core technology. Cost of service revenue consists primarily of personnel, material, overhead and support costs.

	Three Months Ended										Change
	September 30,
	(Dollars in Thousands)
	2021					2020
				% of Revenue					% of Revenue		$		%
Cost of revenue
Product	$	20,340		10	%	$	26,977		13	%	$	(6,637)	(25)	%
Service	31,304			15		31,923			16		(619)		(2)	%
Total cost of revenue	$	51,644		25	%	$	58,900		29	%	$	(7,256)	(12)	%
Gross profit:
Product $	$	81,279		38	%	$	65,002		32	%	$	16,277	25	%
Product gross profit %	80		%			71		%
Service $	$	78,995		37	%	$	81,437		40	%	$	(2,442)	(3)	%
Service gross profit %	72		%			72		%
Total gross profit $	$	160,274				$	146,439				$	13,835	9	%
Total gross profit %	76		%			71		%

Product. The 25%, or $6.6 million, decrease in cost of product revenue for the three months ended September 30, 2021 compared to the same period last year was primarily due to a $6.6 million decrease in costs to deliver model calibration products due to project timing, a $1.7 million decrease in the amortization of intangible assets, and a $0.5 million decrease in direct material costs as a result of product mix. These decreases were partially offset by a $2.2 million increase in obsolescence charges. The product gross profit percentage increased by nine percentage points to 80% during the three months ended September 30, 2021 as compared with the three months ended September 30, 2020. The 25%, or $16.3 million, increase in product gross profit is attributable to the 10%, or $9.6 million, increase in product revenue, and the 25%, or $6.6 million, decrease in cost of product revenue.

Service. The 2%, or $0.6 million, decrease in cost of service revenue for the three months ended September 30, 2021 compared to the same period last year was primarily due to a $1.2 million decrease in cost of materials used to support customers under service contracts, and a $0.7 million decrease in employee-related expenses associated with a decrease in variable incentive compensation as well as a decrease associated with the timing of certain projects. These decreases were partially offset by a $1.0 million increase in contractor fees. The service gross profit percentage remained flat at 72% during the three months ended September 30, 2021 as compared with the three months ended September 30, 2020. The 3%, or $2.4 million decrease in service gross profit is attributable to the 3%, or $3.1 million, decrease in service revenue, partially offset by the 2%, or $0.6 million, decrease in cost of service revenue.

Gross profit. Our gross profit increased 9%, or $13.8 million, during the three months ended September 30, 2021 when compared with the three months ended September 30, 2020. This increase is attributable to the increase in revenue of 3%, or $6.6 million, and the 12%, or $7.3 million, decrease in cost of revenue. The gross profit percentage increased by five percentage points to 76% for the three months ended September 30, 2021 as compared with the three months ended September 30, 2020.

29

Operating Expenses

	Three Months Ended								Change
	September 30,
	(Dollars in Thousands)
	2021				2020
			% of Revenue				% of Revenue		$		%
Research and development	$	44,483	21	%	$	46,455	23	%	$	(1,972)	(4)	%
Sales and marketing	65,185		31		60,300		29		4,885		8	%
General and administrative	23,471		11		20,573		10		2,898		14	%
Amortization of acquired intangible assets	14,970		7		15,363		7		(393)		(3)	%
Restructuring charges	—		—		(31)		—		31		100	%
Total operating expenses	$	148,109	70	%	$	142,660	69	%	$	5,449	4	%

Research and development. Research and development expenses consist primarily of personnel expenses, fees for outside consultants, overhead and related expenses associated with the development of new products and the enhancement of existing products.

The 4%, or $2.0 million, decrease in research and development expenses for the three months ended September 30, 2021 compared to the same period last year was primarily due to a $1.1 million decrease in employee-related expenses associated with a reduction in headcount.

Sales and marketing. Sales and marketing expenses consist primarily of personnel expenses and commissions, overhead and other expenses associated with selling activities and marketing programs such as trade shows, seminars, advertising and new product launch activities.

The 8%, or $4.9 million, increase in total sales and marketing expenses for the three months ended September 30, 2021 compared to the same period last year was primarily due to a $2.7 million increase in commissions expense, and a $1.1 million increase in advertising and other marketing related expenses.

General and administrative. General and administrative expenses consist primarily of personnel expenses for executive, financial, legal and human resource employees, overhead and other corporate expenditures.

The 14%, or $2.9 million, increase in general and administrative expenses for the three months ended September 30, 2021 compared to the same period last year was primarily due to a $2.4 million increase in legal-related expenses and penalties, and a $0.7 million increase in employee related expenses associated with an increase in variable incentive compensation.

Amortization of acquired intangible assets. Amortization of acquired intangible assets consists primarily of amortization of customer relationships, definite-lived trademarks and trade names, and leasehold interests related to our acquisitions of Danaher Corporation's communications business (Comms Transaction), Simena, LLC, Network General Corporation, Avvasi Inc. and Efflux Systems, Inc.

The 3%, or $0.4 million, decrease in amortization of acquired intangible assets was largely due to a decrease in the amortization of intangible assets related to the Comms Transaction, offset by an increase in the amortization of the definite-lived trade name.

Interest and Other Expense, Net. Interest and other expense, net includes interest earned on our cash, cash equivalents and marketable securities, interest expense and other non-operating gains or losses.

	Three Months Ended								Change
	September 30,
	(Dollars in Thousands)
	2021				2020
			% of Revenue				% of Revenue		$		%
Interest and other expense, net	$	(2,336)	(1)	%	$	(3,394)	(2)	%	$	1,058	31	%

The 31%, or $1.1 million, decrease in interest and other expense, net was primarily due to an $0.8 million decrease in foreign exchange expense, and a $0.3 million decrease in interest expense due to debt repayments on the credit facility as well as a decrease in the average interest rate, partially offset by loss on the extinguishment of debt.

30

Income Taxes. Our effective tax rates were 19.7% and 1,057.4% for the three months ended September 30, 2021 and 2020, respectively. The effective income tax rate for the three months ended September 30, 2021 differed from the effective income tax rate for the three months ended September 30, 2020, primarily due to the impact of research and development tax credits, foreign tax credits, the foreign derived intangible income deduction, foreign withholding taxes, and U.S. taxation on foreign earnings relative to forecasted profits, partially offset by discrete non-deductible stock compensation and the remeasurement of certain deferred taxes due to a change in enacted tax rate in the UK.

	Three Months Ended								Change
	September 30,
	(Dollars in Thousands)
	2021				2020
			% of Revenue				% of Revenue		$		%
Income tax expense	$	1,933	1	%	$	4,071	2	%	$	(2,138)	(53)	%

Six Months Ended September 30, 2021 and 2020

Revenue

During the six months ended September 30, 2021, and 2020, no direct customer or indirect channel partner accounted for more than 10% of our total revenue.

	Six Months Ended								Change
	September 30,
	(Dollars in Thousands)
	2021				2020
			% of Revenue				% of Revenue		$		%
Revenue:
Product	$	183,569	46	%	$	163,672	42	%	$	19,897	12	%
Service	218,621		54	%	225,482		58	%	(6,861)		(3)	%
Total revenue	$	402,190	100	%	$	389,154	100	%	$	13,036	3	%

Product. The 12%, or $19.9 million, increase in product revenue compared with the same period last year was primarily due to an increase in revenue from network performance management offerings for enterprise and service provider customers, partially offset by a decrease in revenue from distributed denial of service (DDoS) offerings.

Service. The 3%, or $6.9 million, decrease in service revenue compared with the same period last year was primarily driven by non-renewals associated with service provider consolidation, discontinued product lines, and the timing of renewal bookings.

Total revenue by geography was as follows:

	Six Months Ended								Change
	September 30,
	(Dollars in Thousands)
	2021				2020
			% of Revenue				% of Revenue		$		%
United States	$	236,555	59	%	$	227,350	58	%	$	9,205	4	%
International:
Europe	73,092		18		72,748		19		344		—	%
Asia	32,316		8		27,574		7		4,742		17	%
Rest of the world	60,227		15		61,482		16		(1,255)		(2)	%
Subtotal international	165,635		41		161,804		42		3,831		2	%
Total revenue	$	402,190	100	%	$	389,154	100	%	$	13,036	3	%

31

United States revenue increased 4%, or $9.2 million, primarily due to an increase in revenue from network performance management offerings for enterprise and service provider customers, partially offset by a decrease in revenue from DDoS offerings. The 2%, or $3.8 million increase in international revenue compared with the same period last year was primarily driven by higher revenue from network performance management offerings for service provider and enterprise customers in Asia.

Cost of Revenue and Gross Profit

	Six Months Ended										Change
	September 30,
	(Dollars in Thousands)
	2021					2020
				% of Revenue					% of Revenue		$		%
Cost of revenue
Product	$	43,505		11	%	$	48,129		12	%	$	(4,624)	(10)	%
Service	62,549			16		63,751			16		(1,202)		(2)	%
Total cost of revenue	$	106,054		27	%	$	111,880		28	%	$	(5,826)	(5)	%
Gross profit:
Product $	$	140,064		35	%	$	115,543		30	%	$	24,521	21	%
Product gross profit %	76		%			71		%
Service $	$	156,072		39	%	$	161,731		42	%	$	(5,659)	(3)	%
Service gross profit %	71		%			72		%
Total gross profit $	$	296,136				$	277,274				$	18,862	7	%
Total gross profit %	74		%			71		%

Product. The 10%, or $4.6 million, decrease in cost of product revenue for the six months ended September 30, 2021 compared to the same period last year was primarily due to a $6.4 million decrease in costs to deliver model calibration products due to project timing, and a $3.0 million decrease in the amortization of intangible assets. These decreases were partially offset by a $3.5 million increase in obsolescence charges, and a $1.5 million increase in direct material costs due to an increase in product revenue. The product gross profit percentage increased by five percentage points to 76% during the six months ended September 30, 2021 when compared to the six months ended September 30, 2020. The 21%, or $24.5 million, increase in product gross profit is attributable to the 12%, or $19.9 million, increase in product revenue, and the 10%, or $4.6 million, decrease in cost of product revenue.

Service. The 2%, or $1.2 million, decrease in cost of service revenue six months ended September 30, 2021 compared to the same period last year was primarily due to a $2.8 million decrease in employee-related expenses associated with a decrease in variable incentive compensation as well as a decrease associated with the timing of certain projects, and a $0.7 million decrease in cost of materials used to support customers under service contracts. These decreases were partially offset by a $2.2 million increase in contractor fees. The service gross profit percentage decreased one percentage point to 71% for the six months ended September 30, 2021 when compared to the six months ended September 30, 2020. The 3%, or $5.7 million, decrease in service gross profit is attributable to the 3%, or $6.9 million decrease in service revenue, offset by the 2%, or $1.2 million, decrease in cost of service revenue.

Gross profit. Our gross profit for the six months ended September 30, 2021 increased 7%, or $18.9 million, compared to the same period last year. This increase is primarily attributable to the increase in revenue of 3%, or $13.0 million and the decrease in cost of revenue of 5%, or $5.8 million. The gross profit percentage increased three percentage points to 74% for the six months ended September 30, 2021 when compared to the six months ended September 30, 2020.

32

Operating Expenses

	Six Months Ended								Change
	September 30,
	(Dollars in Thousands)
	2021				2020
			% of Revenue				% of Revenue		$		%
Research and development	$	87,303	22	%	$	91,836	24	%	$	(4,533)	(5)	%
Sales and marketing	131,143		33		119,734		31		11,409		10	%
General and administrative	46,216		11		45,726		12		490		1	%
Amortization of acquired intangible assets	29,976		7		30,624		8		(648)		(2)	%
Restructuring charges	—		—		62		—		(62)		(100)	%
Total operating expenses	$	294,638	73	%	$	287,982	75	%	$	6,656	2	%

Research and development. The 5%, or $4.5 million, decrease in research and development expenses for the six months ended September 30, 2021 compared to the same period last year was primarily due to a $3.9 million decrease in employee-related expenses associated with a reduction in headcount and a decrease in variable incentive compensation and a $0.5 million decrease in depreciation expense.

Sales and marketing. The 10%, or $11.4 million, increase in total sales and marketing expenses for the six months ended September 30, 2021 compared to the same period last year was primarily due to a $5.8 million increase in employee-related expenses largely due to an increase in variable incentive compensation, a $2.2 million increase in expenses related to trade shows, user conferences and other events, a $2.0 million increase in advertising and other marketing related expenses, a $0.7 million increase in commissions expense, and a $0.7 million increase in travel expense primarily attributable to the lifting of COVID-19 related restrictions.

General and administrative. The 1%, or $0.5 million, increase in general and administrative expenses for the six months ended September 30, 2021 compared to the same period last year was primarily due to a $0.3 million increase in employee-related expenses largely due to an increase in variable incentive compensation.

Amortization of acquired intangible assets. Amortization of acquired intangible assets consists primarily of amortization of customer relationships, definite-lived trademark and tradenames, and leasehold interest related to the Comms Transaction and the acquisitions of ONPATH, Simena, Psytechnics, Network General, Avvasi and Efflux.

The 2%, or $0.6 million, decrease in amortization of acquired intangible assets for the six months ended September 30, 2021 compared to the same period last year was largely due to a decrease in the amortization of intangible assets related to the Comms Transaction, offset by an increase in the amortization of the definite-lived trade name.

Interest and Other Expense, Net

	Six Months Ended								Change
	September 30,
	(Dollars in Thousands)
	2021				2020
			% of Revenue				% of Revenue		$		%
Interest and other expense, net	$	(4,756)	(1)	%	$	(8,174)	(2)	%	$	3,418	42	%

The 42%, or $3.4 million, decrease in interest and other expense, net was primarily due to a $2.5 million decrease in foreign exchange expense, and a $1.2 million decrease in interest expense due to debt repayments on the credit facility as well as a decrease in the average interest rate, partially offset by a loss on the extinguishment of debt. These decreases to interest and other expense, net were partially offset by a $0.3 million decrease in interest income.

Income Taxes. Our effective income tax rates were 5.7% and 11.8% for the six months ended September 30, 2021 and 2020, respectively. The effective income tax rate for the six months ended September 30, 2021 differed from the effective rate for the six months ended September 30, 2020, primarily due to the impact of research and development tax credits, foreign tax credits, the foreign derived intangible income deduction, foreign withholding taxes, and U.S. taxation on foreign earnings relative to forecasted profits partially offset by discrete non-deductible stock compensation.

33

	Six Months Ended								Change
	September 30,
	(Dollars in Thousands)
	2021				2020
			% of Revenue				% of Revenue		$		%
Income tax expense	$	187	—	%	$	2,224	1	%	$	(2,037)	(92)	%

Off-Balance Sheet Arrangements

At September 30, 2021 and 2020, we did not have any off-balance sheet arrangements as defined in Regulation S-K, Item 303(a)(4)(ii).

Commitments and Contingencies

We account for claims and contingencies in accordance with authoritative guidance that requires us to record an estimated loss from a claim or loss contingency when information available prior to issuance of our consolidated financial statements indicates that it is probable that a liability has been incurred at the date of the consolidated financial statements and the amount of the loss can be reasonably estimated. If we determine that it is reasonably possible, but not probable, that an asset has been impaired or a liability has been incurred, or if the amount of a probable loss cannot be reasonably estimated, then, in accordance with the authoritative guidance, we disclose the amount or range of estimated loss if the amount or range of estimated loss is material. Accounting for claims and contingencies requires us to use our judgment. We consult with legal counsel on those issues related to litigation and seek input from other experts and advisors with respect to matters in the ordinary course of business.

For information regarding our legal proceedings, see Note 12 contained in the "Notes to Consolidated Financial Statements" included in Part I of this Quarterly Report on Form 10-Q.

Backlog

We produce our products on the basis of our forecast of near-term demand and maintain inventory in advance of receipt of firm orders from customers. We configure our products to customer specifications and generally deliver products shortly after receipt of the purchase order. Service engagements are also included in certain orders. Customers generally may reschedule or cancel orders with little or no penalty. We believe that our backlog at any particular time is not meaningful because it is not necessarily indicative of future sales levels. Our combined product backlog at September 30, 2021 increased by $55.9 million since March 31, 2021 to $83.8 million. A majority of the backlog relates to customization and integration projects and radio frequency propagation modeling. In some cases, we have begun these projects but have not yet hit billable milestones. A majority of revenue for these projects is expected to be recognized into revenue throughout fiscal year 2022.

Liquidity and Capital Resources

Cash, cash equivalents and marketable securities consisted of the following (in thousands):

	September 30, 2021		March 31, 2021
Cash and cash equivalents	$	468,470	$	467,176
Short-term marketable securities	7,347		9,277
Cash, cash equivalents and marketable securities	$	475,817	$	476,453

Cash, cash equivalents and marketable securities

At September 30, 2021, cash, cash equivalents and marketable securities (current and non-current) totaled $475.8 million, a $0.7 million decrease from $476.5 million at March 31, 2021. This decrease was primarily due to $24.4 million used in treasury stock repurchases, $15.0 million used for tax withholdings on restricted stock units, $4.3 million used for capital expenditures, and $3.7 million used for the payment of debt issuance costs, partially offset by $47.3 million in cash provided by operating activities during the six months ended September 30, 2021.

34

At September 30, 2021, cash and short-term and long-term investments in the United States were $304.0 million, while cash held outside the United States was approximately $171.8 million.

Cash and cash equivalents were impacted by the following:

	Six Months Ended
	September 30,
	(in thousands)
	2021		2020
Net cash provided by operating activities	$	47,339	$	56,646
Net cash (used in) provided by investing activities	$	(2,352)	$	28,114
Net cash used in financing activities	$	(43,068)	$	(13,599)

Net cash from operating activities

Cash provided by operating activities was $47.3 million during the six months ended September 30, 2021, compared with $56.6 million of cash provided by operating activities during the six months ended September 30, 2020. The $9.3 million decrease was due in part to a $27.2 million decrease from accrued compensation and other expenses, a $9.7 million decrease from accounts receivable, a $4.9 million decrease from depreciation and amortization, a $2.8 million decrease from prepaid expenses and other assets, a $2.1 million decrease from income taxes payable, a $0.4 million decrease from operating lease liabilities, and a $0.3 million decrease from operating lease right-of-use assets. These decreases were partially offset by a $17.7 million increase from a change in net loss, a $15.6 million increase from deferred revenue, a $2.9 million increase from share-based compensation, a $1.0 million increase from accounts payable, a $0.6 million increase from the loss on extinguishment of debt, and a $0.4 million increase from deferred income taxes during the six months ended September 30, 2021 as compared with the six months ended September 30, 2020.

Net cash from investing activities

	Six Months Ended
	September 30,
	(in thousands)
	2021		2020
Cash (used in) provided by investing activities included the following:
Purchase of marketable securities	$	(11,343)	$	(6,780)
Proceeds from sales and maturity of marketable securities	13,266		45,094
Purchase of fixed assets	(4,301)		(5,769)
Purchase of intangible assets	—		(4,537)
Decrease in deposits	26		106
	$	(2,352)	$	28,114

Cash used in investing activities was $2.4 million during the six months ended September 30, 2021, compared with $28.1 million of cash provided by investing activities during the six months ended September 30, 2020. The $30.5 million decrease in cash (used in) provided by investing activities was due in part to a $31.8 million decrease in proceeds from the sales and maturity of marketable securities, and a $4.6 million decrease related to the purchase of marketable securities, during the six months ended September 30, 2021 when compared with the six months ended September 30, 2020. These decreases were partially offset by a $4.5 million cash outflow related to agreements to acquire technology licenses during the six months ended September 30, 2020, and a $1.5 million decrease in cash used for capital expenditures during the six months ended September 30, 2021 when compared to the six months ended September 30, 2020.

Our investments in property and equipment consist primarily of computer equipment, demonstration units, office equipment and facility improvements. We plan to continue to invest in capital expenditures to support our infrastructure through the remainder of fiscal year 2022.

35

Net cash from financing activities

	Six Months Ended
	September 30,
	(in thousands)
	2021		2020
Cash used in financing activities included the following:
Issuance of common stock under stock plans	$	2	$	1
Payment of contingent consideration	—		(1,000)
Treasury stock repurchases	(24,413)		—
Tax withholding on restricted stock units	(14,997)		(12,600)
Payment of debt issuance costs	(3,660)		—
Repayment of long-term debt	(350,000)		—
Proceeds from issuance of long-term debt	350,000		—
	$	(43,068)	$	(13,599)

Cash used in financing activities increased by $29.5 million to $43.1 million during the six months ended September 30, 2021, compared with $13.6 million of cash used in financing activities during the six months ended September 30, 2020.

During the six months ended September 30, 2020, we paid $1.0 million of contingent purchase consideration related to the Eastwind acquisition in April 2020.

During the six months ended September 30, 2021, we repurchased 921,299 shares of our common stock for $24.6 million under the twenty-five million share repurchase program. There were no share repurchases during the six months ended September 30, 2020.

In connection with the delivery of our common stock upon vesting of restricted stock units, we withheld 523,539 and 481,739 shares at a cost of $15.0 million and $12.6 million related to minimum statutory tax withholding requirements on these restricted stock units during the six months ended September 30, 2021 and 2020, respectively. These withholding transactions do not fall under the repurchase program described above, and therefore do not reduce the number of shares that are available for repurchase under that program.

During the six months ended September 30, 2021, we paid $3.7 million in debt issuance costs related to the execution of our Second Amended and Restated Credit Agreement.

Credit Facility

On January 16, 2018, we amended and expanded our existing credit agreement (Amended Credit Agreement), which provided for a five-year, $1.0 billion senior secured revolving credit facility, including a letter of credit sub-facility of up to $75.0 million. The commitments under the Amended Credit Agreement were set to expire on January 16, 2023, and any outstanding loans were due on that date.

On July 27, 2021, we amended and extended the Amended Credit Agreement (Second Amended and Restated Credit Agreement) with a syndicate of lenders by and among: the Company; JPMorgan Chase Bank, N.A. (JPMorgan), as administrative agent and collateral agent; JPMorgan, Wells Fargo Securities, LLC, BofA Securities Inc., RBC Capital Markets, PNC Capital Markets LLC and Mizuho Bank, Ltd., as joint lead arrangers and joint bookrunners; Santander Bank, N.A., U.S. Bank National Association, Fifth Third Bank National Association, Silicon Valley Bank and TD Bank, N.A., as co-documentation agents; and the lenders party thereto.

The Second Amended and Restated Credit Agreement provides for a five-year, $800.0 million senior secured revolving credit facility, including a letter of credit sub-facility of up to $75.0 million. We may elect to use the credit facility for general corporate purposes (including to finance the repurchase of shares of our common stock). The commitments under the Second Amended and Restated Credit Agreement will expire on July 27, 2026, and any outstanding loans will be due on that date.

In connection with the Second Amended and Restated Credit Agreement, we paid off the outstanding balance of $350 million under the Amended Credit Agreement on July 27, 2021 by borrowing the same amount under the Second Amended and Restated Credit Agreement. Additionally, we recorded a loss on the extinguishment of debt of $0.6 million, representing the write off of unamortized deferred financing costs, which was included in interest expense in the consolidated statements of operations for the three and six months ended September 30, 2021. At September 30, 2021, $350 million was outstanding under the Second Amended and Restated Credit Agreement.

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At our election, revolving loans under the Second Amended and Restated Credit Agreement bear interest at either (a) an Alternate Base Rate per annum equal to the greatest of (1) the Wall Street Journal prime rate; (2) the New York Federal Reserve Bank (NYFRB) rate plus 0.50%, or (3) an adjusted one month LIBO rate plus 1%; or (b) a Term Benchmark Borrowing rate (for the interest period selected by NetScout, subject to customary provisions regarding succession from LIBO rate to SOF rate in anticipation of the upcoming discontinuation of the LIBO rate), in each case plus an applicable margin. For the initial period until we have delivered financial statements for the quarter ended September 30, 2021, the applicable margin will be 1.25% per annum for Term Benchmark Revolving loans and 0.25% per annum for Alternate Base Rate loans, and thereafter the applicable margin will vary depending on our consolidated gross leverage ratio, ranging from 1.00% per annum for Alternate Base Rate loans and 2.00% per annum for Term Benchmark Revolving loans if our consolidated gross leverage ratio is greater than 3.50 to 1.00, down to 0.00% per annum for Alternate Base Rate loans and 1.00% per annum for Term Benchmark Revolving loans if our consolidated gross leverage ratio is equal to or less than 1.50 to 1.00.

Our consolidated gross leverage ratio is the ratio of our total funded debt compared to our consolidated EBITDA as defined in the Second Amended and Restated Credit Agreement (adjusted consolidated EBITDA). Adjusted consolidated EBITDA includes certain adjustments, including, without limitation, adjustments relating to extraordinary, unusual or non-recurring charges, certain restructuring charges, non-cash charges, certain transaction costs and expenses and certain pro forma adjustments in connection with material acquisitions and dispositions, all as set forth in detail in the Second Amended and Restated Credit Agreement. Our secured net leverage ratio is the ratio of our Consolidated Total Debt minus the lesser of unrestricted cash and 125% of adjusted consolidated EBITDA compared to our adjusted consolidated EBITDA.

Commitment fees will accrue on the daily unused amount of the credit facility. For the initial period until we have delivered financial statements for the quarter ended September 30, 2021, the commitment fee will be 0.20% per annum, and thereafter the commitment fee will vary depending on our consolidated gross leverage ratio, ranging from 0.30% per annum if our consolidated gross leverage ratio is greater than 2.75 to 1.00, down to 0.15% per annum if our consolidated gross leverage ratio is equal to or less than 1.50 to 1.00.

Letter of credit participation fees are payable to each lender providing the letter of credit sub-facility on the amount of such lender's letter of credit exposure, during the period from the closing date of the Second Amended and Restated Credit Agreement to, but excluding, the date which is the later of (i) the date on which such lender's commitment terminates or (ii) the date on which such lender ceases to have any letter of credit exposure, at the applicable rate that would be used to determine the interest rate applicable to Term Benchmark Revolving loans assuming such loans were outstanding during the period. Additionally, we will pay a fronting fee to each issuing bank in amounts to be agreed to between us and the applicable issuing bank.

Interest on Alternate Base Rate loans is payable at the end of each calendar quarter. Interest on Term Benchmark Revolving loans is payable at the end of each interest rate period or at the end of each three-month interval within an interest rate period if the period is longer than three months. We may also prepay loans under the Second Amended and Restated Credit Agreement at any time, without penalty, subject to certain notice requirements.

The loans and other obligations under the credit facility are (a) guaranteed by each of our wholly-owned material domestic restricted subsidiaries, subject to certain exceptions, and (b) are secured by substantially all of the assets of us and the subsidiary guarantors, including a pledge of all the capital stock of material subsidiaries held directly by the Borrower and the subsidiary guarantors (which pledge, in the case of any foreign subsidiary, is limited to 65% of the voting stock), subject to certain customary exceptions and limitations. The Second Amended and Restated Credit Agreement generally prohibits any other liens on the assets of NetScout and our restricted subsidiaries, subject to certain exceptions as described in the Second Amended and Restated Credit Agreement.

The Second Amended and Restated Credit Agreement contains certain covenants applicable to us and our restricted subsidiaries, including, without limitation, limitations on additional indebtedness, liens, various fundamental changes, dividends and distributions, investments (including acquisitions), transactions with affiliates, asset sales, including sale-leaseback transactions, speculative hedge agreements, payment of junior financing, changes in business and other limitations customary in senior secured credit facilities. The Second Amended and Restated Credit Agreement requires us to maintain a certain consolidated net leverage ratio and removes the previous requirement under the Amended Credit Agreement that we maintain a minimum consolidated interest coverage ratio. These covenants and limitations are more fully described in the Second Amended and Restated Credit Agreement. As of September 30, 2021, we were in compliance with the specified total consolidated net leverage ratio range of 4.00 to 1.00.

The Second Amended and Restated Credit Agreement provides that events of default will exist in certain circumstances, including failure to make payment of principal or interest on the loans when required, failure to perform certain obligations under the Second Amended and Restated Credit Agreement and related documents including a failure to meet the maximum total consolidated net leverage ratio covenant, defaults under certain other indebtedness, certain insolvency events, certain events arising under ERISA, a change of control and certain other events. Upon an event of default, the administrative agent with the consent of, or at the request of, the holders of more than 50% in principal amount of the loans and commitments, may

37

terminate the commitments and accelerate the maturity of the loans and enforce certain other remedies under the Second Amended and Restated Credit Agreement and the other loan documents.

We had unamortized capitalized debt issuance costs, net of $5.5 million at September 30, 2021, which are being amortized over the life of the revolving credit facility. The unamortized capitalized debt issuance costs balance of $1.1 million was included as prepaid expenses and other current assets and a balance of $4.4 million was included as other assets in our consolidated balance sheet.

Expectations for Fiscal Year 2022

We are actively managing the business to generate cash flow and believe that we currently have adequate liquidity. We believe that these factors will allow us to meet our currently anticipated funding requirements.

We expect net cash provided by operating activities combined with cash, cash equivalents, and marketable securities and borrowing availability under our revolving credit facility to provide sufficient liquidity to fund current obligations, capital spending, debt service requirements and working capital requirement over at least the next twelve months.

Additionally, a portion of our cash may be used to acquire or invest in complementary businesses or products, to obtain the right to use complementary technologies, to repay borrowings under our Second Amended and Restated Credit Agreement, or to repurchase shares of our common stock through our stock repurchase program. From time to time, in the ordinary course of business, we evaluate potential acquisitions of such businesses, products or technologies. If our existing sources of liquidity are insufficient to satisfy our liquidity requirements, we may seek to sell additional equity or debt securities. The sale of additional equity or debt securities could result in additional dilution to our stockholders.

Recent Accounting Pronouncements

For information with respect to recent accounting pronouncements on our consolidated financial statements, see Note 1 contained in the "Notes to Consolidated Financial Statements" included in Part I of this Quarterly Report on Form 10-Q.

38

Item 3.  Quantitative and Qualitative Disclosures About Market Risk

Interest Rate Risk. We hold our cash, cash equivalents and investments for working capital purposes. Some of the securities we invest in are subject to market risk. This means that a change in prevailing interest rates may cause the principal amount of the investment to fluctuate. To minimize this risk, we maintain our portfolio of cash, cash equivalents and investments in a variety of securities, including money market funds and government debt securities. The risk associated with fluctuating interest rates is limited to our investment portfolio. Due to the short-term nature of these instruments, we believe that we do not have any material exposure to changes in the fair value of our investment portfolio as a result of changes in interest rates. Declines in interest rates, however, would reduce future interest income. The effect of a hypothetical 10% increase or decrease in overall interest rates would not have had a material impact on our operating results or the total fair value of the portfolio.

We are exposed to market risks related to fluctuations in interest rates related to our credit facility. At September 30, 2021, we owed $350 million on this loan with an interest rate of 1.34%. A sensitivity analysis was performed on the outstanding portion of our debt obligation as of September 30, 2021. Should the current weighted-average interest rate increase or decrease by 10%, the resulting annual increase or decrease to interest expense would be approximately $0.5 million as of September 30, 2021.

Foreign Currency Exchange Risk. As a result of our foreign operations, we face exposure to movements in foreign currency exchange rates, primarily the Euro, British Pound, Canadian Dollar and Indian Rupee. The current exposures arise primarily from expenses denominated in foreign currencies. We currently engage in foreign currency hedging activities in order to limit these exposures. Periodically, we also enter into forward contracts to manage exchange risk associated with third-party transactions and for which we do not elect hedge accounting treatment. We do not use derivative financial instruments for speculative trading purposes.

At September 30, 2021, we had foreign currency forward contracts designated as hedging instruments with notional amounts totaling $1.8 million. The valuation of outstanding foreign currency forward contracts at September 30, 2021 resulted in an asset balance of $9 thousand, reflecting favorable rates in comparison to current market rates and a liability balance of $32 thousand, reflecting unfavorable contract rates in comparison to current market rates at this date. At March 31, 2021, we had foreign currency forward contracts designated as hedging instruments with notional amounts totaling $11.0 million and foreign currency forward contracts not designated as hedging instruments with a notional amount of $6.4 million. The valuation of outstanding foreign currency forward contracts (both designated and not designated as hedging instruments) at March 31, 2021 resulted in a liability balance of $191 thousand, reflecting unfavorable contract rates in comparison to current market rates and an asset balance of $57 thousand, reflecting favorable rates in comparison to current market rates at this date. The effect of a hypothetical 10% change in foreign currency exchange rates applicable to our business would not have a material impact on our historical consolidated financial statements. As our international operations grow, we will continue to reassess our approach to manage our risk relating to fluctuations in currency rates.

Item 4.  Controls and Procedures

At September 30, 2021, NetScout, under the supervision and with the participation of our management, including the Company's principal executive officer and principal financial officer, evaluated the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rule 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (Exchange Act)). Based upon that evaluation, our principal executive officer and principal financial officer concluded that, at September 30, 2021, our disclosure controls and procedures were effective at the reasonable assurance level in ensuring that material information relating to NetScout, including its consolidated subsidiaries, required to be disclosed by NetScout in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, including ensuring that such material information is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate, to allow timely decisions regarding required disclosure.

There were no changes in our internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f) occurred during the period covered by this quarterly report that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

39

PART II: OTHER INFORMATION

Item 1.  Legal Proceedings

For information regarding our legal proceedings, see Note 12 contained in the "Notes to Consolidated Financial Statements" included in Part I of this Quarterly Report on Form 10-Q.

Item 1A.  Risk Factors

In addition to the other information set forth in this report, you should carefully consider the factors discussed in Part I, Item 1A. “Risk Factors” in our Annual Report on Form 10-K for our fiscal year ended March 31, 2021. The risks discussed in our Annual Report on Form 10-K could materially affect our business, financial condition and future results. There have been no material changes to those risk factors since we filed our Annual Report on Form 10-K. The risks described in our Annual Report on Form 10-K are not the only risks facing us. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially and adversely affect our business, financial condition or operating results.

Item 2.  Unregistered Sales of Equity Securities and Use of Proceeds

Sales of Unregistered Securities

None.

Issuer Purchase of Equity Securities

The following table provides information about purchases we made during the quarter ended September 30, 2021 of equity securities that are registered by us pursuant to Section 12 of the Exchange Act:

Period	Total Number of Shares Purchased (1)	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Number of Shares That May Yet be Purchased Under the Program
7/1/2021-7/31/2021	712	$	28.69	—	7,089,160
8/1/2021-8/31/2021	682,585	27.68		324,683	6,764,477
9/1/2021-9/30/2021	597,408	26.71		596,616	6,167,861
Total	1,280,705	$	27.23	921,299	6,167,861

(1)We purchased an aggregate of 359,406 shares during the three months ended September 30, 2021 transferred to us from employees in satisfaction of minimum tax withholding obligations associated with the vesting of restricted stock units during the period. Such purchases reflected in the table do not reduce the maximum number of shares that may be purchased under our previously announced stock repurchase program (our previously disclosed twenty-five million share repurchase program).

Item 3.  Defaults Upon Senior Securities

None.

Item 4.  Mine Safety Disclosures

Not Applicable.

Item 5.  Other Information

None.

40

Item 6. Exhibits

(a)Exhibits

3.1		Composite conformed copy of Third Amended and Restated Certificate of Incorporation of NetScout (as amended) (filed as Exhibit 3.2 to NetScout's current report on Form 8-K, SEC File No. 000-26251, filed on September 21, 2016, and incorporated herein by reference).
3.2		Amended and Restated By-laws of NetScout (filed as Exhibit 3.1 to NetScout's current report on Form 8-K, SEC File No. 000-26251, filed on May 11, 2020 and incorporated herein by reference).
10.1		Second Amendment and Restatement Agreement, dated as of July 27, 2021, to the Amended and Restated Credit Agreement, dated as of January 16, 2018, by and among NetScout Systems, Inc., as borrower; certain subsidiaries of NetScout Systems, Inc., as loan parties; the lenders and issuing banks party thereto and JPMorgan Chase Bank, N.A., as administrative agent attaching the Second Amended and Restated Credit Agreement, dated as of July 27, 2021, by and among NetScout Systems, Inc., as borrower; JPMorgan Chase Bank, N.A., as administrative agent and collateral agent; JPMorgan Chase Bank, N.A., Wells Fargo Securities, LLC, BofA Securities Inc., RBC Capital Markets, PNC Capital Markets LLC and Mizuho Bank, Ltd., as joint lead arrangers and joint bookrunners; Santander Bank, N.A., U.S. Bank National Association, Fifth Third Bank, National Association, Silicon Valley Bank and TD Bank, N.A. as co-documentation agents; and the lenders and issuing banks party thereto (filed as Exhibit 10.5 to NetScout's current report on Form 8-K, SEC File No. 000-26251, filed on July 27, 2021 and incorporated herein by reference).
10.2*	+	Summary of Non-Employee Director Compensation.
31.1	+	Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	+	Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	++	Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	++	Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	+	XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	+	Inline XBRL Taxonomy Extension Schema Document.
101.CAL	+	Inline XBRL Taxonomy Extension Calculation Linkbase document.
101.DEF	+	Inline XBRL Taxonomy Extension Definition Linkbase document.
101.LAB	+	Inline XBRL Taxonomy Extension Label Linkbase document.
101.PRE	+	Inline XBRL Taxonomy Extension Presentation Linkbase document.
104		The cover page from the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2021 formatted in Inline XBRL

*	Indicates a management contract or compensatory plan or arrangement.
+	Filed herewith.
++	Exhibit has been furnished, is not deemed filed and is not to be incorporated by reference into any of the Company's filings under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, irrespective of any general incorporation language contained in any such filing.

41

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	NETSCOUT SYSTEMS, INC.
Date: November 4, 2021	/s/ Anil K. Singhal
	Anil K. Singhal
	President, Chief Executive Officer and Chairman
	(Principal Executive Officer)
Date: November 4, 2021	/s/ Jean Bua
	Jean Bua
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)
	(Principal Accounting Officer)

42

EX-10.2

Exhibit 10.2

NetScout Systems, Inc.

Summary of Non-Employee Director Compensation

Non-employee directors are compensated $60,000 annually for their services and do not receive any additional compensation for any regular Board meeting attended. The lead non-employee director receives an additional annual retainer of $35,000. Non-employee directors will receive $15,000 annually for serving on the Audit Committee, $10,000 annually for serving on the Compensation Committee, $6,000 annually for serving on the Nominating and Corporate Governance Committee, and $6,000 annually for serving on the Finance Committee. In addition, directors who are chairpersons of a particular committee are also given additional annual compensation of $15,000 for the Audit Committee, $10,000 for the Compensation Committee, $6,000 for the Nominating and Corporate Governance Committee, and $6,000 for the Finance Committee. The cash component of their compensation is paid quarterly. Non-employee directors are also reimbursed for their reasonable out-of-pocket expenses incurred in attending meetings of the Board or of any committee and for attendance at approved director education programs.

Non-employee directors are each granted an annual equity-based award in the form of restricted stock units. Effective September 12, 2018, the amount of the annual equity-based award is 7,000 restricted stock units. These restricted stock units vest 100% on the one year anniversary of the grant date provided that during such year, such director attends at least 75%, collectively, of the meetings of the Board and any committee of the Board of which such director is a member. In the event that the foregoing attendance requirements are not met, then 100% of these restricted stock units will vest on the third anniversary of the date of grant. No other equity awards are given to our non-employee directors.

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Anil K. Singhal, certify that:

1.I have reviewed this quarterly report on Form 10-Q of NetScout Systems, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ Anil K. Singhal

Anil K. Singhal

President, Chief Executive Officer and Chairman

(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Jean Bua, certify that:

1.I have reviewed this quarterly report on Form 10-Q of NetScout Systems, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ Jean Bua

Jean Bua

Executive Vice President and Chief Financial Officer

(Principal Financial Officer)

(Principal Accounting Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of NetScout Systems, Inc. (the “Company”) on Form 10-Q for the period ending September 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Anil K. Singhal, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Anil K. Singhal

Anil K. Singhal

President, Chief Executive Officer and Chairman

Principal Executive Officer

November 4, 2021

This certification accompanies the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of NetScout Systems, Inc. under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of NetScout Systems, Inc. (the “Company”) on Form 10-Q for the period ending September 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Jean Bua, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Jean Bua

Jean Bua

Executive Vice President and Chief Financial Officer

(Principal Financial Officer)

(Principal Accounting Officer)

November 4, 2021

This certification accompanies the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of NetScout Systems, Inc. under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

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	Sep. 30, 2021	Oct. 27, 2021
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Document Type	10-Q
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Entity Registrant Name	NETSCOUT SYSTEMS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-2837575
Entity Address, Address Line One	310 Littleton Road
Entity Address, City or Town	Westford
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01886
City Area Code	978
Local Phone Number	614-4000
Title of 12(b) Security	Common Stock, $0.001 par value per share
Trading Symbol	NTCT
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		73,874,712
Entity Central Index Key	0001078075
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Amendment Flag	false

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Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Current assets:
Cash and cash equivalents	$ 468,470	$ 467,176
Marketable securities	7,347	9,277
Accounts receivable and unbilled costs, net of allowance for doubtful accounts of $398 and $416 at September 30, 2021 and March 31, 2021, respectively	162,888	197,717
Inventories and deferred costs	25,728	22,813
Prepaid income taxes	11,526	1,906
Prepaid expenses and other current assets	25,629	23,583
Total current assets	701,588	722,472
Fixed assets, net	45,008	48,474
Operating lease right-of-use assets	56,715	61,512
Goodwill	1,717,870	1,717,554
Intangible assets, net	474,448	511,866
Deferred income taxes	8,064	8,096
Other assets	12,705	15,064
Total assets	3,016,398	3,085,038
Current liabilities:
Accounts payable	17,644	17,964
Accrued compensation	57,783	83,057
Accrued other	31,802	21,127
Income taxes payable	4,840	7,025
Deferred revenue and customer deposits	246,726	269,748
Current portion of operating lease liabilities	11,992	12,354
Total current liabilities	370,787	411,275
Other long-term liabilities	12,315	21,641
Deferred tax liability	85,987	92,287
Accrued long-term retirement benefits	39,704	39,479
Long-term deferred revenue and customer deposits	102,457	103,310
Operating lease liabilities, net of current portion	56,144	61,267
Long-term debt	350,000	350,000
Total liabilities	1,017,394	1,079,259
Commitments and contingencies (Note 12)
Preferred stock, $0.001 par value:
5,000,000 shares authorized; no shares issued or outstanding at September 30, 2021 and March 31, 2021	0	0
Common stock, $0.001 par value:
300,000,000 shares authorized; 126,108,858 and 124,197,974 shares issued and 74,217,661 and 73,751,615 shares outstanding at September 30, 2021 and March 31, 2021, respectively	126	124
Additional paid-in capital	2,991,704	2,955,400
Accumulated other comprehensive loss	(1,931)	(1,940)
Treasury stock at cost, 51,891,197 and 50,446,359 shares at September 30, 2021 and March 31, 2021, respectively	(1,362,141)	(1,322,496)
Retained earnings	371,246	374,691
Total stockholders' equity	1,999,004	2,005,779
Total liabilities and stockholders' equity	$ 3,016,398	$ 3,085,038

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 398	$ 416
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	126,108,858	124,197,974
Common stock, shares outstanding (in shares)	74,217,661	73,751,615
Treasury stock, shares (in shares)	51,891,197	50,446,359

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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue:
Total revenue	$ 211,918	$ 205,339	$ 402,190	$ 389,154
Cost of revenue:
Total cost of revenue	51,644	58,900	106,054	111,880
Gross profit	160,274	146,439	296,136	277,274
Operating expenses:
Research and development	44,483	46,455	87,303	91,836
Sales and marketing	65,185	60,300	131,143	119,734
General and administrative	23,471	20,573	46,216	45,726
Amortization of acquired intangible assets	14,970	15,363	29,976	30,624
Restructuring charges	0	(31)	0	62
Total operating expenses	148,109	142,660	294,638	287,982
Income (loss) from operations	12,165	3,779	1,498	(10,708)
Interest and other expense, net:
Interest income	45	171	109	437
Interest expense	(2,411)	(2,715)	(4,566)	(5,789)
Other income (expense), net	30	(850)	(299)	(2,822)
Total interest and other expense, net	(2,336)	(3,394)	(4,756)	(8,174)
Income (loss) before income tax expense	9,829	385	(3,258)	(18,882)
Income tax expense	1,933	4,071	187	2,224
Net income (loss)	$ 7,896	$ (3,686)	$ (3,445)	$ (21,106)
Basic net income (loss) per share (in dollars per share)	$ 0.11	$ (0.05)	$ (0.05)	$ (0.29)
Diluted net income (loss) per share (in dollars per share)	$ 0.11	$ (0.05)	$ (0.05)	$ (0.29)
Weighted average common shares outstanding used in computing:
Net income (loss) per share - basic (in shares)	74,382	73,058	74,122	72,682
Net income (loss) per share - diluted (in shares)	75,093	73,058	74,122	72,682
Product
Revenue:
Total revenue	$ 101,619	$ 91,979	$ 183,569	$ 163,672
Cost of revenue:
Total cost of revenue	20,340	26,977	43,505	48,129
Service
Revenue:
Total revenue	110,299	113,360	218,621	225,482
Cost of revenue:
Total cost of revenue	$ 31,304	$ 31,923	$ 62,549	$ 63,751

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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 7,896	$ (3,686)	$ (3,445)	$ (21,106)
Other comprehensive income (loss):
Cumulative translation adjustments	(52)	940	(33)	1,893
Changes in market value of investments:
Changes in unrealized losses, net of tax benefit of $0, ($10), ($2) and ($33), respectively	0	(33)	(5)	(107)
Total net change in market value of investments	0	(33)	(5)	(107)
Changes in market value of derivatives:
Changes in market value of derivatives, net of (benefit) taxes of ($9), $55, $30 and $59, respectively	(33)	181	97	188
Reclassification adjustment for net gains (losses) included in net income (loss), net of taxes (benefit) of $9,($32), ($15) and ($22), respectively	31	(105)	(50)	(72)
Total net change in market value of derivatives	(2)	76	47	116
Other comprehensive income (loss)	(54)	983	9	1,902
Total comprehensive income (loss)	$ 7,842	$ (2,703)	$ (3,436)	$ (19,204)

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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Changes in unrealized losses, tax expense (benefit)	$ 0	$ (10)	$ (2)	$ (33)
Changes in market value of derivatives, tax expense (benefit)	(9)	55	30	59
Reclassification adjustment for net (losses) gains included in net loss, tax expense (benefit)	$ 9	$ (32)	$ (15)	$ (22)

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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Voting	Additional Paid In Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Retained Earnings
Beginning balance (in shares) at Mar. 31, 2020		122,006,077			(49,785,171)
Beginning balance at Mar. 31, 2020	$ 1,937,919	$ 122	$ 2,891,553	$ (3,160)	$ (1,305,935)	$ 355,339
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(21,106)					(21,106)
Unrealized net investment losses	(107)			(107)
Unrealized net gains (loss) on derivative financial instruments	116			116
Cumulative translation adjustments	1,893			1,893
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		1,555,056
Issuance of common stock pursuant to vesting of restricted stock units	1	$ 1
Stock-based compensation expense for restricted stock units granted to employees	26,729		26,729
Issuance of common stock under employee stock purchase plan (in shares)		279,812
Issuance of common stock under employee stock purchase plan	6,475		6,475
Repurchase of treasury stock (in shares)					(481,739)
Repurchase of treasury stock	(12,600)				$ (12,600)
Ending balance (in shares) at Sep. 30, 2020		123,840,945			(50,266,910)
Ending balance at Sep. 30, 2020	1,939,320	$ 123	2,924,757	(1,258)	$ (1,318,535)	334,233
Beginning balance (in shares) at Jun. 30, 2020		122,353,504			(49,898,334)
Beginning balance at Jun. 30, 2020	1,929,817	$ 122	2,903,055	(2,241)	$ (1,309,038)	337,919
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(3,686)					(3,686)
Unrealized net investment losses	(33)			(33)
Unrealized net gains (loss) on derivative financial instruments	76			76
Cumulative translation adjustments	940			940
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		1,207,629
Issuance of common stock pursuant to vesting of restricted stock units	1	$ 1
Stock-based compensation expense for restricted stock units granted to employees	15,227		15,227
Issuance of common stock under employee stock purchase plan (in shares)		279,812
Issuance of common stock under employee stock purchase plan	6,475		6,475
Repurchase of treasury stock (in shares)					(368,576)
Repurchase of treasury stock	(9,497)				$ (9,497)
Ending balance (in shares) at Sep. 30, 2020		123,840,945			(50,266,910)
Ending balance at Sep. 30, 2020	1,939,320	$ 123	2,924,757	(1,258)	$ (1,318,535)	334,233
Beginning balance (in shares) at Mar. 31, 2021		124,197,974			(50,446,359)
Beginning balance at Mar. 31, 2021	2,005,779	$ 124	2,955,400	(1,940)	$ (1,322,496)	374,691
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(3,445)					(3,445)
Unrealized net investment losses	(5)			(5)
Unrealized net gains (loss) on derivative financial instruments	47			47
Cumulative translation adjustments	(33)			(33)
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		1,659,576
Issuance of common stock pursuant to vesting of restricted stock units	2	$ 2
Stock-based compensation expense for restricted stock units granted to employees	29,414		29,414
Issuance of common stock under employee stock purchase plan (in shares)		251,308
Issuance of common stock under employee stock purchase plan	6,890		6,890
Repurchase of treasury stock (in shares)					(1,444,838)
Repurchase of treasury stock	(39,645)				$ (39,645)
Ending balance (in shares) at Sep. 30, 2021		126,108,858			(51,891,197)
Ending balance at Sep. 30, 2021	1,999,004	$ 126	2,991,704	(1,931)	$ (1,362,141)	371,246
Beginning balance (in shares) at Jun. 30, 2021		124,694,737			(50,610,492)
Beginning balance at Jun. 30, 2021	2,002,955	$ 124	2,968,631	(1,877)	$ (1,327,273)	363,350
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	7,896					7,896
Unrealized net investment losses	0
Unrealized net gains (loss) on derivative financial instruments	(2)			(2)
Cumulative translation adjustments	(52)			(52)
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		1,162,813
Issuance of common stock pursuant to vesting of restricted stock units	2	$ 2
Stock-based compensation expense for restricted stock units granted to employees	16,183		16,183
Issuance of common stock under employee stock purchase plan (in shares)		251,308
Issuance of common stock under employee stock purchase plan	6,890		6,890
Repurchase of treasury stock (in shares)					(1,280,705)
Repurchase of treasury stock	(34,868)				$ (34,868)
Ending balance (in shares) at Sep. 30, 2021		126,108,858			(51,891,197)
Ending balance at Sep. 30, 2021	$ 1,999,004	$ 126	$ 2,991,704	$ (1,931)	$ (1,362,141)	$ 371,246

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net loss	$ (3,445)	$ (21,106)
Adjustments to reconcile net loss to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	48,246	53,152
Loss on extinguishment of debt	596	0
Operating lease right-of-use assets	4,904	5,190
Loss on disposal of fixed assets	2	37
Share-based compensation expense	30,700	27,832
Deferred income taxes	(6,270)	(6,624)
Other gains	(10)	0
Changes in assets and liabilities
Accounts receivable and unbilled costs	34,935	44,640
Inventories	(5,481)	(5,472)
Prepaid expenses and other assets	(7,082)	(4,330)
Accounts payable	(313)	(1,339)
Accrued compensation and other expenses	(17,753)	9,484
Operating lease liabilities	(5,591)	(5,168)
Income taxes payable	(2,225)	(171)
Deferred revenue	(23,874)	(39,479)
Net cash provided by operating activities	47,339	56,646
Cash flows from investing activities:
Purchase of marketable securities	(11,343)	(6,780)
Proceeds from sales and maturity of marketable securities	13,266	45,094
Purchase of fixed assets	(4,301)	(5,769)
Purchase of intangible assets	0	(4,537)
Decrease in deposits	26	106
Net cash (used in) provided by investing activities	(2,352)	28,114
Cash flows from financing activities:
Issuance of common stock under stock plans	2	1
Payment of contingent consideration	0	(1,000)
Treasury stock repurchases	(24,413)	0
Tax withholding on restricted stock units	(14,997)	(12,600)
Payment of debt issuance costs	(3,660)	0
Repayment of long-term debt	(350,000)	0
Proceeds from issuance of long-term debt	350,000	0
Net cash used in financing activities	(43,068)	(13,599)
Effect of exchange rate changes on cash and cash equivalents	(625)	5,069
Net increase in cash and cash equivalents and restricted cash	1,294	76,230
Cash and cash equivalents and restricted cash, beginning of period	467,176	340,237
Cash and cash equivalents and restricted cash, end of period	468,470	416,467
Supplemental disclosures:
Cash paid for interest	2,540	4,177
Cash paid for income taxes	18,963	5,377
Non-cash transactions:
Transfers of inventory to fixed assets	2,657	1,530
Additions to property, plant and equipment included in accounts payable	243	605
Issuance of common stock under employee stock plans	6,890	6,475
Unsettled share repurchases, included in accounts payable	$ 235	$ 0

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BASIS OF PRESENTATION

6 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

BASIS OF PRESENTATION

BASIS OF PRESENTATION

The accompanying unaudited interim consolidated financial statements have been prepared by NetScout Systems, Inc. (NetScout or the Company). Certain information and footnote disclosures normally included in financial statements prepared under United States generally accepted accounting principles (GAAP) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). In the opinion of management, the unaudited interim consolidated financial statements include all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of the Company's financial position and stockholders' equity, results of operations and cash flows. The year-end consolidated balance sheet data and statement of stockholders' equity were derived from the Company's audited financial statements, but do not include all disclosures required by GAAP. The results reported in these unaudited interim consolidated financial statements are not necessarily indicative of results that may be expected for the entire year. All significant intercompany accounts and transactions are eliminated in consolidation.

These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements, including the notes thereto, included in the Company's Annual Report on Form 10-K for the fiscal year ended March 31, 2021 filed with the Securities and Exchange Commission on May 20, 2021.

COVID-19 Risks and Uncertainties

The Company is closely monitoring the impact of the COVID-19 pandemic on all aspects of its business. The future impacts of the pandemic and any resulting economic impact on the Company's operations are evolving. It is possible that the COVID-19 pandemic, the measures taken by the governments of countries affected and the resulting economic impact may materially and adversely affect the Company’s results of operations, cash flows and financial position as well as its customers.

Under Accounting Standards Update (ASU) 2014-15, Presentation of Financial Statements—Going Concern (Subtopic 205-40), or ASC 205-40, the Company has the responsibility to evaluate whether conditions and/or events raise substantial doubt about its ability to meet its future financial obligations as they become due within one year after the date that the financial statements are issued. The Company has and continues to take precautionary actions to limit costs and spending across the organization. This includes limiting discretionary spending and hiring activities. In addition, based on covenant levels at September 30, 2021, the Company had, as of September 30, 2021, an incremental $450 million available under the revolving credit facility.

On March 27, 2020, the Coronavirus Aid, Relief and Economic Security Act (the CARES Act) was enacted. The CARES Act, among other things, includes provisions relating to refundable payroll tax credits, deferment of employer social security payments, net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property. The Company has elected to defer the employer-paid portion of social security taxes. As of September 30, 2021, the Company had deferred $8.9 million of employer payroll taxes, of which 50% are required to be deposited by December 2021 and the remaining 50% by December 2022. The balance of $4.5 million was included as accrued other and a balance of $4.4 million was included as other long-term liabilities in the Company's consolidated balance sheet at September 30, 2021.

The Company expects net cash provided by operations combined with cash, cash equivalents, and marketable securities and borrowing availability under the revolving credit facility to provide sufficient liquidity to fund current obligations, capital spending, debt service requirements and working capital requirements over at least the next twelve months.

Recent Accounting Pronouncements

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments provide optional guidance for a limited time to ease the potential burden in accounting for reference rate reform. The new guidance provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts and hedging relationships that reference LIBOR or another reference rate expected to be discontinued due to reference rate reform. In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform, which clarifies the scope and application of certain optional expedients and exceptions regarding the original guidance. ASU 2021-01 may be applied prospectively through December 31, 2022. The expedients and exceptions provided by the amendments do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. The adoption is not expected to have a material impact on the Company's financial position, results of operations, and disclosures.

In January 2020, the FASB issued ASU 2020-01, Investments-Equity Securities (Topic 321), Investments-Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) - Clarifying the Interactions between Topic 321, Topic 323, and Topic 815. This guidance addresses accounting for the transition into and out of the equity method and provides clarification of the interaction of rules for equity securities, the equity method of accounting, and forward contracts and purchase options on certain types of securities. This standard is effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2020. The Company adopted the guidance as of April 1, 2021. The adoption did not have a material impact on the Company's consolidated financial statements.

In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes. ASU 2019-12 simplifies the accounting for income taxes, eliminates certain exceptions within ASC 740, Income Taxes, and clarifies certain aspects of the current guidance to promote consistency among reporting entities. ASU 2019-12 is effective for fiscal years beginning after December 15, 2020. The Company adopted the guidance as of April 1, 2021. The adoption did not have a material impact on the Company's consolidated financial statements.

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REVENUE

6 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

REVENUE

REVENUE

Revenue Recognition Policy

The Company exercises judgment and uses estimates in connection with determining the amounts of product and service revenues to be recognized in each accounting period.

The Company derives revenues primarily from the sale of network management tools and security solutions for service provider and enterprise customers, which include hardware, software and service offerings. The Company's product sales consist of software only offerings and offerings which include hardware appliances with embedded software that are essential to providing customers the intended functionality of the solutions.

The Company accounts for revenue once a legally enforceable contract with a customer has been approved by the parties and the related promises to transfer products or services have been identified. A contract is defined by the Company as an arrangement with commercial substance identifying payment terms, each party’s rights and obligations regarding the products or services to be transferred and the amount the Company deems probable of collection. Customer contracts may include promises to transfer multiple products and services to a customer. Determining whether the products and services are considered distinct performance obligations that should be accounted for separately or as one combined performance obligation may require significant judgment. Revenue is recognized when control of the products or services are transferred to the Company's customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for products and services.

Product revenue is typically recognized upon shipment, provided a legally enforceable contract exists, control has passed to the customer, and in the case of software products, when the customer has the rights and ability to access the software, and collection of the related receivable is probable. If any significant obligations to the customer remain post-delivery, typically involving obligations relating to installation and acceptance by the customer, revenue recognition is deferred until such obligations have been fulfilled. The Company's service offerings include installation, integration, extended warranty and maintenance services, post-contract customer support, stand-ready software-as-a-service (SAAS) and other professional services including consulting and training. The Company generally provides software and/or hardware support as part of product sales. Revenue related to the initial bundled software and hardware support is recognized ratably over the support period. In addition, customers can elect to purchase extended support agreements for periods after the initial software/hardware warranty expiration. Support services generally include rights to unspecified upgrades (when and if available), telephone and internet-based support, updates, bug fixes and hardware repair and replacement. Consulting services are recognized upon delivery or completion of performance depending on the terms of the underlying contract. Reimbursements of out-of-pocket expenditures incurred in connection with providing consulting services are included in services revenue, with the offsetting expense recorded in cost of service revenue. Training services include on-site and classroom training. Training revenues are recognized upon delivery of the training.

Generally, the Company's contracts are accounted for individually. However, when contracts are closely interrelated and dependent on each other, it may be necessary to account for two or more contracts as one to reflect the substance of the group of contracts.

Bundled arrangements are concurrent customer purchases of a combination of the Company's product and service offerings that may be delivered at various points in time. The Company allocates the transaction price among the performance obligations in an amount that depicts the relative standalone selling prices (SSP) of each obligation. Judgment is required to determine the SSP for each distinct performance obligation. The Company uses a range of amounts to estimate SSP when it sells each of the products and services separately based on the element’s historical pricing. The Company also considers its overall pricing objectives and practices across different sales channels and geographies, and market conditions. Generally, the Company has established SSP for a majority of its service elements based on historical standalone sales. In certain instances,

the Company has established SSP for services based upon an estimate of profitability and the underlying cost to fulfill those services. Further, for certain service engagements, the Company considers quoted prices as part of multi-element arrangements of those engagements as a basis for establishing SSP. SSP has been established for product elements as the average or median selling price the element was recently sold for, whether sold alone or sold as part of a multiple element transaction. The Company reviews sales of the product elements on a quarterly basis and updates, when appropriate, its SSP for such elements to ensure that it reflects recent pricing experience. The Company's products are distributed through its direct sales force and indirect distribution channels through alliances with resellers and distributors. Revenue arrangements with resellers and distributors are recognized on a sell-in basis; that is, when control of the product transfers to the reseller or distributor. The Company records consideration given to a customer as a reduction of revenue to the extent they have recorded revenue from the customer. With limited exceptions, the Company's return policy does not allow product returns for a refund. Returns have been insignificant to date. In addition, the Company has a history of successfully collecting receivables from its resellers and distributors.

During the six months ended September 30, 2021, the Company recognized revenue of $168.4 million related to the Company's deferred revenue balance reported at March 31, 2021.

Performance Obligations

Customer contracts may include promises to transfer multiple products and services to a customer. Determining whether the products and services are considered distinct performance obligations that should be accounted for separately or as one combined performance obligation may require significant judgment. The transaction price is allocated among performance obligations in bundled contracts in an amount that depicts the relative standalone selling prices of each obligation.

For contracts involving distinct hardware and software licenses, the performance obligations are satisfied at a point in time when control is transferred to the customer. For standalone maintenance and post-contract support (PCS) the performance obligation is satisfied ratably over the contract term as a stand-ready obligation. For consulting and training services, the performance obligation may be satisfied over the contract term as a stand-ready obligation, satisfied over a period of time as those services are delivered, or satisfied at the completion of the service when control has transferred, or the services have expired unused.

Payments for hardware, software licenses, one-year maintenance, PCS and consulting services, are typically due up front with payment terms of 30 to 90 days. However, the Company does have contracts pursuant to which billings occur ratably over a period of years following the transfer of control for the contracted performance obligations. Payments on multi-year maintenance, PCS and consulting services are typically due in annual installments over the contract term. The Company did not have any material variable consideration such as obligations for returns, refunds or warranties at September 30, 2021.

At September 30, 2021, the Company had total deferred revenue of $349.2 million, which represents the aggregate total contract price allocated to undelivered performance obligations. The Company expects to recognize $246.7 million, or 71%, of this revenue during the next 12 months, and expects to recognize the remaining $102.5 million, or 29%, of this revenue thereafter.

There are circumstances for which the Company does not recognize revenue relating to sales transactions that have been billed, and the related account receivable has not been collected. While the receivable represents an enforceable obligation, the Company does not believe its right to payment is unconditional, therefore for balance sheet presentation purposes, the Company has not recognized the deferred revenue, or the related account receivable and no amounts appear in the consolidated balance sheets for such transactions because control of the underlying deliverable has not transferred. The aggregate amount of unrecognized accounts receivable and deferred revenue was $8.9 million and $7.1 million at September 30, 2021 and March 31, 2021, respectively.

NetScout expects that the amount of billed and unbilled deferred revenue will change from quarter to quarter for several reasons, including the specific timing, duration and size of large customer support and service agreements, varying billing cycles of such agreements, the specific timing of customer renewals, and foreign currency fluctuations. The Company did not have material significant financing components, or variable consideration or performance obligations satisfied in a prior period recognized during the six months ended September 30, 2021.

Contract Balances

The Company may receive payments from customers based on billing schedules as established by the Company's contracts. Contract assets relate to performance obligations where control has transferred to the customer in advance of scheduled billings. The Company records unbilled accounts receivable representing the right to consideration in exchange for goods or services that have been transferred to a customer conditional on the passage of time. Deferred revenue relates to scenarios where billings occur before all performance obligations are delivered or payments are received in advance of performance under the contract.

Costs to Obtain Contracts

The Company has determined that the only significant incremental costs incurred to obtain contracts with customers within the scope of Topic 606 are sales commissions paid to its employees. Sales commissions are recorded as an asset and amortized to expense ratably over the remaining performance periods of the related contracts with remaining performance obligations. The Company expenses costs as incurred for sales commissions when the amortization period would have been one year or less.

At September 30, 2021, the consolidated balance sheet included $7.3 million in assets related to sales commissions to be expensed in future periods. A balance of $4.1 million was included in prepaid expenses and other current assets, and a balance of $3.2 million was included in other assets in the Company's consolidated balance sheet at September 30, 2021. At March 31, 2021, the consolidated balance sheet included $7.4 million in assets related to sales commissions to be expensed in future periods. A balance of $4.1 million was included in prepaid expenses and other current assets, and a balance of $3.3 million was included in other assets in the Company's consolidated balance sheet at March 31, 2021.

During the three and six months ended September 30, 2021 and 2020, respectively, the Company recognized $1.5 million, $1.5 million, $3.1 million and $3.1 million of amortization related to this sales commission asset, which is included in the sales and marketing expense line in the Company's consolidated statements of operations.

Allowance for Credit Losses

The Company continually monitors collections from its customers. The Company evaluates the collectability of its accounts receivable and determines the appropriate allowance for credit losses based on a combination of factors, including but not limited to, analysis of the aging schedules, past due balances, historical collection experience and prevailing economic conditions.

The following table summarizes the activity in the allowance for credit losses (in thousands):

Balance at March 31, 2021	$	416
Recoveries and other adjustments	(1)
Write off charged against the allowance for credit losses	(17)
Balance at September 30, 2021	$	398

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CONCENTRATION OF CREDIT RISK AND SIGNIFICANT CUSTOMERS

6 Months Ended

Sep. 30, 2021

Risks and Uncertainties [Abstract]

CONCENTRATION OF CREDIT RISK AND SIGNIFICANT CUSTOMERS

CONCENTRATION OF CREDIT RISK AND SIGNIFICANT CUSTOMERS

Financial instruments that potentially subject the Company to concentration of credit risk consist primarily of investments, trade accounts receivable and accounts payable. The Company's cash, cash equivalents, and marketable securities are placed with financial institutions with high credit standings.

At September 30, 2021, and at March 31, 2021, the Company had one direct customer, Verizon, which accounted for more than 10% of the accounts receivable balance, while no indirect channel partners accounted for more than 10% of the accounts receivable balance.

During the three months ended September 30, 2021, one direct customer, Verizon, accounted for more than 10% of the Company's total revenue, while no indirect channel partners accounted for more than 10% of total revenue. During the six months ended September 30, 2021, no direct customers or channel partners accounted for more than 10% of total revenue. During the three and six months ended September 30, 2020, no direct customers or indirect channel partners accounted for more than 10% of the Company's total revenue.

Historically, the Company has not experienced any significant failure of its customers' ability to meet their payment obligations nor does the Company anticipate material non-performance by its customers in the future; accordingly, the Company does not require collateral from its customers. However, if the Company's assumptions are incorrect, there could be an adverse impact on its allowance for doubtful accounts.

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SHARE-BASED COMPENSATION

6 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

SHARE-BASED COMPENSATION

SHARE-BASED COMPENSATIONOn September 12, 2019, the Company's stockholders approved the 2019 Equity Incentive Plan (2019 Plan), which replaced the Company's 2007 Equity Incentive Plan, as amended (Amended 2007 Plan). The 2019 Plan permitted the granting of incentive and nonstatutory stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, and other stock awards, collectively referred to as "share-based awards." On September 10, 2020, the Company's stockholders approved an amendment and restatement of the 2019 Equity Incentive Plan (the 2019 Amended Plan) to increase the number of shares authorized for issuance by 4,700,000, established a one-year minimum vesting requirement for awards granted on or

after September 10, 2020, and changed the factor used to calculate the increase or reduction in the number of shares available for issuance under the 2019 Amended Plan.

Periodically, the Company grants share-based awards to employees, officers, and directors of the Company and its subsidiaries. During the six months ended September 30, 2021, the Company granted performance-based restricted stock units to certain executive officers that vest based upon the Company's total shareholder return as compared to the Russell 2000 Index over a three-year period. The performance-based restricted stock units were valued using the Monte Carlo Simulation model. The Company accounts for all share-based awards in accordance with GAAP, which requires the measurement and recognition of compensation expense based on estimated fair values for all share-based payment awards made to its employees and directors. Share-based award grants are generally measured at fair value on the date of grant based on the number of shares granted and the quoted price of the Company's common stock. Such value is recognized as a cost of revenue or an operating expense over the corresponding vesting period.

The following is a summary of share-based compensation expense including restricted stock units and performance-based restricted stock units granted pursuant to the Company's Amended 2007 Plan, the 2019 Plan, and the 2019 Amended Plan and employee stock purchases made under the Company's 2011 Employee Stock Purchase Plan, as amended, (ESPP), based on estimated fair values within the applicable cost and expense lines identified below (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Cost of product revenue	$	321	$	344	$	595	$	589
Cost of service revenue	1,907		1,810		3,520		3,160
Research and development	4,902		4,935		8,993		8,716
Sales and marketing	5,842		5,357		10,656		9,349
General and administrative	3,763		3,290		6,936		6,018
	$	16,735	$	15,736	$	30,700	$	27,832

Employee Stock Purchase Plan – The Company maintains the ESPP for all eligible employees as described in the Company's Annual Report on Form 10-K for the year ended March 31, 2021. Under the ESPP, shares of the Company's common stock may be purchased on the last day of each bi-annual offering period at 85% of the fair value on the last day of such offering period. The offering periods run from March 1st through August 31st and from September 1st through the last day of February each year. During the six months ended September 30, 2021, employees purchased 251,308 shares under the ESPP and the value per share was $23.31.

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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND MARKETABLE SECURITIES

6 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

CASH, CASH EQUIVALENTS, RESTRICTED CASH AND MARKETABLE SECURITIES

CASH, CASH EQUIVALENTS, RESTRICTED CASH AND MARKETABLE SECURITIES

The 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 mainly consisted of U.S. government and municipal obligations, commercial paper, money market instruments and cash maintained with various financial institutions at September 30, 2021 and March 31, 2021.

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):

	September 30, 2021		March, 31, 2021		September 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

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 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 securities	7,347		—		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 paper	5,699		—		5,699
Total short-term marketable securities	9,270		7		9,277
Total long-term marketable securities	—		—		—
Total marketable securities	$	9,270	$	7	$	9,277

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

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FAIR VALUE MEASUREMENTS

6 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value. Level 1 refers to fair values determined based on quoted prices in active markets for identical assets. Level 2 refers to fair values estimated using significant other observable inputs, and Level 3 includes fair values estimated using significant non-observable inputs. The following tables present the Company's financial assets and liabilities measured on a recurring basis using the fair value hierarchy at September 30, 2021 and March 31, 2021 (in thousands):

	Fair Value Measurements at
	September 30, 2021
	Level 1		Level 2		Level 3		Total
ASSETS:
Cash and cash equivalents	$	468,470	$	—	$	—	$	468,470
Commercial paper	—		7,347		—		$	7,347
Derivative financial instruments	—		9		—		9
	$	468,470	$	7,356	$	—	$	475,826
LIABILITIES:
Derivative financial instruments	$	—	$	(32)	$	—	$	(32)
	$	—	$	(32)	$	—	$	(32)

	Fair Value Measurements at
	March 31, 2021
	Level 1		Level 2		Level 3		Total
ASSETS:
Cash and cash equivalents	$	467,176	$	—	$	—	$	467,176
U.S. government and municipal obligations	2,539		1,039		—		3,578
Commercial paper	—		5,699		—		5,699
Derivative financial instruments	—		57		—		57
	$	469,715	$	6,795	$	—	$	476,510
LIABILITIES:
Derivative financial instruments	$	—	$	(191)	$	—	$	(191)
	$	—	$	(191)	$	—	$	(191)

This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. On a recurring basis, the Company measures certain financial assets and liabilities at fair value, including marketable securities and derivative financial instruments.

The Company's Level 1 investments are classified as such because they are valued using quoted market prices or alternative pricing sources with reasonable levels of price transparency.

The Company's Level 2 investments are classified as such because fair value is calculated using market observable data for similar but not identical instruments, or a discounted cash flow model using the contractual interest rate as compared to the underlying interest yield curve. The Company classifies municipal obligations as Level 2 because the fair values are determined using quoted prices from markets the Company considers to be inactive. Commercial paper is classified as Level 2 because the Company uses market information from similar but not identical instruments and discounted cash flow models based on interest rate yield curves to determine fair value. The Company's derivative financial instruments consist of forward foreign exchange contracts and are classified as Level 2 because the fair values of these derivatives are determined using models based on market observable inputs, including spot prices for foreign currencies and credit derivatives, as well as an interest rate factor.

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INVENTORIES

6 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

INVENTORIES

INVENTORIESInventories are stated at the lower of actual cost or net realizable value. Cost is determined by using the first in, first out (FIFO) method. Inventories consist of the following (in thousands):

	September 30, 2021		March 31, 2021
Raw materials	$	13,426	$	13,189
Work in process	763		16
Finished goods	6,139		6,168
Deferred costs	5,400		3,440
	$	25,728	$	22,813

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GOODWILL AND INTANGIBLE ASSETS

6 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS

Goodwill

The Company has one reporting unit. The Company assesses goodwill for impairment at the reporting unit level at least annually, or on an interim basis if an event occurs or circumstances change that would, more likely than not, reduce the fair value of the reporting unit below its carrying value. The Company completed its annual impairment test on January 31, 2021 using the qualitative Step 0 assessment as the Company concluded that it was more likely than not that the fair value of the reporting unit exceeded its carrying value.

At September 30, 2021 and March 31, 2021, the carrying amount of goodwill was $1.7 billion. The change in the carrying amount of goodwill for the six months ended September 30, 2021 was due to the impact of foreign currency translation adjustments related to asset balances that are recorded in currencies other than the U.S. Dollar.

The following table summarizes the changes in the carrying amount of goodwill for the six months ended September 30, 2021 as follows (in thousands):

Balance at March 31, 2021	$	1,717,554
Foreign currency translation impact	316
Balance at September 30, 2021	$	1,717,870

Intangible Assets

The net carrying amounts of intangible assets were $474.4 million and $511.9 million at September 30, 2021 and March 31, 2021, respectively. Intangible assets acquired in a business combination are recorded under the acquisition method of accounting at their estimated fair values at the date of acquisition. The Company amortizes acquired intangible assets over their estimated useful lives. During the first quarter of fiscal year 2022, in conjunction with the renewal process of the Company's acquired indefinite-lived trade name and the Company's focus on advancing new product lines, the Company reassessed the estimated economic life of the acquired indefinite-lived trade name. As a result, the Company began amortizing the acquired trade name over 8 years. Prior to reclassifying the acquired trade name to a finite-lived intangible asset, the Company tested the acquired trade name for impairment and determined the fair value of the asset exceeded the carrying value. This change in estimate does not materially impact the Company's income statement.

Intangible assets include the following amortizable intangible assets at September 30, 2021 (in thousands):

	Cost		Accumulated Amortization		Net
Developed technology	$	251,995	$	(219,320)	$	32,675
Customer relationships	775,625		(360,357)		415,268
Distributor relationships and technology licenses	11,465		(8,405)		3,060
Definite-lived trademark and trade name (a)	58,021		(34,825)		23,196
Core technology	7,192		(7,192)		—
Net beneficial leases	336		(336)		—
Non-compete agreements	292		(292)		—
Capitalized software	3,317		(3,303)		14
Other	1,208		(973)		235
	$	1,109,451	$	(635,003)	$	474,448

(a) The Company's $18.6 million acquired trade name changed from indefinite-lived during the first quarter of fiscal year 2022.

Intangible assets include the indefinite-lived trade name with a carrying value of $18.6 million and the following amortizable intangible assets at March 31, 2021 (in thousands):

	Cost		Accumulated Amortization		Net
Developed technology	$	252,071	$	(212,688)	$	39,383
Customer relationships	775,898		(333,903)		441,995
Distributor relationships and technology licenses	11,469		(7,829)		3,640
Definite-lived trademark and trade name	39,434		(31,467)		7,967
Core technology	7,192		(7,192)		—
Net beneficial leases	336		(336)		—
Non-compete agreements	292		(292)		—
Capitalized software	3,317		(3,281)		36
Other	1,208		(963)		245
	$	1,091,217	$	(597,951)	$	493,266

Amortization included as cost of product revenue consists of amortization of developed technology, distributor relationships and technology licenses, core technology and software. Amortization included as operating expense consists of all other intangible assets. The following table provides a summary of amortization expense for the three and six months ended September 30, 2021 and 2020, respectively (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Amortization of intangible assets included as:
Cost of product revenue	$	3,654	$	5,320	$	7,316	$	10,333
Operating expense	14,975		15,368		29,986		30,634
	$	18,629	$	20,688	$	37,302	$	40,967

The following is the expected future amortization expense at September 30, 2021 for the fiscal years ending March 31 (in thousands):

2022 (remaining six months)	$	37,158
2023	66,701
2024	58,455
2025	51,231
2026	46,878
Thereafter	214,025
	$	474,448

The weighted-average amortization period of developed technology and core technology is 11.2 years. The weighted-average amortization period for customer and distributor relationships is 15.9 years. The weighted-average amortization period for trademarks and trade names is 8.4 years. The weighted-average amortization period for capitalized software is 3.0 years. The weighted-average amortization period for amortizing all intangible assets is 14.6 years.

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

6 Months Ended

Sep. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

NetScout operates internationally and, in the normal course of business, is exposed to fluctuations in foreign currency exchange rates. The exposures result from costs that are denominated in currencies other than the U.S. Dollar, primarily the Euro, British Pound, Canadian Dollar, and Indian Rupee. The Company manages its foreign cash flow risk by hedging forecasted cash flows for operating expenses denominated in foreign currencies for up to twelve months, within specified guidelines through the use of forward contracts. The Company enters into foreign currency exchange contracts to hedge cash flow exposures from costs that are denominated in currencies other than the U.S. Dollar. These hedges are designated as cash flow hedges at inception.

NetScout also periodically enters into forward contracts to manage exchange rate risks associated with certain third-party transactions and for which the Company does not elect hedge accounting treatment as there is no difference in the timing of gain or loss recognition on the hedging instrument and the hedged item.

All of the Company's derivative instruments are utilized for risk management purposes, and the Company does not use derivatives for speculative trading purposes. These contracts will mature over the next twelve months and are expected to impact earnings on or before maturity.

The notional amounts and fair values of derivative instruments in the consolidated balance sheets at September 30, 2021 and March 31, 2021 were as follows (in thousands):

	Notional Amounts (a)				Prepaid Expenses and Other Current Assets				Accrued Other
	September 30, 2021		March 31, 2021		September 30, 2021		March 31, 2021		September 30, 2021		March 31, 2021
Derivatives Designated as Hedging Instruments:
Forward contracts	$	1,792	$	11,037	$	9	$	57	$	32	$	152
Derivatives Not Designated as Hedging Instruments:
Forward contracts	—		6,373		—		—		—		39
					$	9	$	57	$	32	$	191

(a) Notional amounts represent the gross contract/notional amount of the derivatives outstanding.

The following table provides the effect foreign exchange forward contracts designated as hedging instruments had on other comprehensive income (loss) (OCI) and results of operations for the three months ended September 30, 2021 and 2020 (in thousands):

	Gain (Loss) Recognized in OCI on Derivative (a)				Gain (Loss) Reclassified from Accumulated OCI into Income (b)
	September 30, 2021		September 30, 2020		Location	September 30, 2021		September 30, 2020
Forward contracts	$	(42)	$	236	Research and development	$	(6)	$	(22)
					Sales and marketing	46		(115)
	$	(42)	$	236		$	40	$	(137)

(a)The amount represents the change in fair value of derivative contracts due to changes in spot rates.

(b)The amount represents reclassification from other comprehensive income to earnings that occurs when the hedged item affects earnings.

The following table provides the effect foreign exchange forward contracts not designated as hedging instruments had on the Company's results of operations for the three months ended September 30, 2021 and 2020 (in thousands):

	Gain Recognized in Income (a)
	Location	September 30, 2021		September 30, 2020
Forward contracts	General and administrative	$	—	$	46
		$	—	$	46

(a)The amount represents the change in fair value of derivative contracts due to changes in spot rates.

The following table provides the effect foreign exchange forward contracts designated as hedging instruments had on other comprehensive income (loss) (OCI) and results of operations for the six months ended September 30, 2021 and 2020 (in thousands):

	Gain Recognized in OCI on Derivative (a)				Loss Reclassified from Accumulated OCI into Income (b)
	September 30, 2021		September 30, 2020		Location	September 30, 2021		September 30, 2020
Forward contracts	$	127	$	247	Research and development	$	(14)	$	(13)
					Sales and marketing	(51)		(81)
	$	127	$	247		$	(65)	$	(94)

(a)The amount represents the change in fair value of derivative contracts due to changes in spot rates.

(b)The amount represents reclassification from other comprehensive income to earnings that occurs when the hedged item affects earnings.

The following table provides the effect foreign exchange forward contracts not designated as hedging instruments had on the Company's results of operations for the six months ended September 30, 2021 and 2020 (in thousands):

	Gain Recognized in Income (a)
	Location	September 30, 2021		September 30, 2020
Forward contracts	General and administrative	$	—	$	46
		$	—	$	46

(a)The amount represents the change in fair value of derivative contracts due to changes in spot rates.

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LONG-TERM DEBT

6 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

LONG-TERM DEBT

LONG-TERM DEBT

On January 16, 2018, the Company amended and expanded its existing credit agreement (Amended Credit Agreement), which provided for a five-year, $1.0 billion senior secured revolving credit facility, including a letter of credit sub-facility of up to $75.0 million. The commitments under the Amended Credit Agreement were set to expire on January 16, 2023, and any outstanding loans were due on that date.

On July 27, 2021, the Company amended and extended the Amended Credit Agreement (Second Amended and Restated Credit Agreement) with a syndicate of lenders by and among: the Company; JPMorgan Chase Bank, N.A. (JPMorgan), as administrative agent and collateral agent; JPMorgan, Wells Fargo Securities, LLC, BofA Securities Inc., RBC Capital Markets, PNC Capital Markets LLC and Mizuho Bank, Ltd., as joint lead arrangers and joint bookrunners; Santander Bank, N.A., U.S. Bank National Association, Fifth Third Bank National Association, Silicon Valley Bank and TD Bank, N.A., as co-documentation agents; and the lenders party thereto.

The Second Amended and Restated Credit Agreement provides for a five-year, $800.0 million senior secured revolving credit facility, including a letter of credit sub-facility of up to $75.0 million. The Company may elect to use the credit facility for general corporate purposes (including to finance the repurchase of shares of the Company's common stock). The commitments under the Second Amended and Restated Credit Agreement will expire on July 27, 2026, and any outstanding loans will be due on that date.

In connection with the Second Amended and Restated Credit Agreement, the Company paid off the outstanding balance of $350 million under the Amended Credit Agreement on July 27, 2021 by borrowing the same amount under the Second Amended and Restated Credit Agreement. Additionally, the Company recorded a loss on the extinguishment of debt of $0.6 million, representing the write off of unamortized deferred financing costs, which was included in interest expense in the consolidated statements of operations for the three and six months ended September 30, 2021. At September 30, 2021, $350 million was outstanding under the Second Amended and Restated Credit Agreement.

At the Company's election, revolving loans under the Second Amended and Restated Credit Agreement bear interest at either (a) an Alternate Base Rate per annum equal to the greatest of (1) the Wall Street Journal prime rate; (2) the New York Federal Reserve Bank (NYFRB) rate plus 0.50%, or (3) an adjusted one month LIBO rate plus 1%; or (b) a Term Benchmark Borrowing rate (for the interest period selected by the Company, subject to customary provisions regarding succession from LIBO rate to SOF rate in anticipation of the upcoming discontinuation of the LIBO rate), in each case plus an applicable margin. For the initial period until the Company has delivered financial statements for the quarter ended September 30, 2021, the applicable margin will be 1.25% per annum for Term Benchmark Revolving loans and 0.25% per annum for Alternate Base Rate loans, and thereafter the applicable margin will vary depending on the Company's consolidated gross leverage ratio, ranging from 1.00% per annum for Alternate Base Rate loans and 2.00% per annum for Term Benchmark Revolving loans if the Company's consolidated gross leverage ratio is greater than 3.50 to 1.00, down to 0.00% per annum for Alternate Base Rate loans and 1.00% per annum for Term Benchmark Revolving loans if the Company's consolidated gross leverage ratio is equal to or less than 1.50 to 1.00.

The Company's consolidated gross leverage ratio is the ratio of its total funded debt compared to its consolidated EBITDA as defined in the Second Amended and Restated Credit Agreement (adjusted consolidated EBITDA). Adjusted consolidated EBITDA includes certain adjustments, including, without limitation, adjustments relating to extraordinary, unusual or non-recurring charges, certain restructuring charges, non-cash charges, certain transaction costs and expenses and certain pro forma adjustments in connection with material acquisitions and dispositions, all as set forth in detail in the Second Amended and Restated Credit Agreement. The Company's secured net leverage ratio is the ratio of its Consolidated Total Debt minus the lesser of unrestricted cash and 125% of adjusted consolidated EBITDA compared to its adjusted consolidated EBITDA.

Commitment fees will accrue on the daily unused amount of the credit facility. For the initial period until the Company has delivered financial statements for the quarter ended September 30, 2021, the commitment fee will be 0.20% per annum, and

thereafter the commitment fee will vary depending on the Company's consolidated gross leverage ratio, ranging from 0.30% per annum if the Company's consolidated gross leverage ratio is greater than 2.75 to 1.00, down to 0.15% per annum if the Company's consolidated gross leverage ratio is equal to or less than 1.50 to 1.00.

Letter of credit participation fees are payable to each lender providing the letter of credit sub-facility on the amount of such lender's letter of credit exposure, during the period from the closing date of the Second Amended and Restated Credit Agreement to, but excluding, the date which is the later of (i) the date on which such lender's commitment terminates or (ii) the date on which such lender ceases to have any letter of credit exposure, at the applicable rate that would be used to determine the interest rate applicable to Term Benchmark Revolving loans assuming such loans were outstanding during the period. Additionally, the Company will pay a fronting fee to each issuing bank in amounts to be agreed to between the Company and the applicable issuing bank.

Interest on Alternate Base Rate loans is payable at the end of each calendar quarter. Interest on Term Benchmark Revolving loans is payable at the end of each interest rate period or at the end of each three-month interval within an interest rate period if the period is longer than three months. The Company may also prepay loans under the Second Amended and Restated Credit Agreement at any time, without penalty, subject to certain notice requirements.

The loans and other obligations under the credit facility are (a) guaranteed by each of the Company’s wholly-owned material domestic restricted subsidiaries, subject to certain exceptions, and (b) are secured by substantially all of the assets of the Company and the subsidiary guarantors, including a pledge of all the capital stock of material subsidiaries held directly by the Borrower and the subsidiary guarantors (which pledge, in the case of any foreign subsidiary, is limited to 65% of the voting stock), subject to certain customary exceptions and limitations. The Second Amended and Restated Credit Agreement generally prohibits any other liens on the assets of the Company and its restricted subsidiaries, subject to certain exceptions as described in the Second Amended and Restated Credit Agreement.

The Second Amended and Restated Credit Agreement contains certain covenants applicable to the Company and its restricted subsidiaries, including, without limitation, limitations on additional indebtedness, liens, various fundamental changes, dividends and distributions, investments (including acquisitions), transactions with affiliates, asset sales, including sale-leaseback transactions, speculative hedge agreements, payment of junior financing, changes in business and other limitations customary in senior secured credit facilities. The Second Amended and Restated Credit Agreement requires the Company to maintain a certain consolidated net leverage ratio and removes the previous requirement under the Amended Credit Agreement that the Company maintain a minimum consolidated interest coverage ratio. These covenants and limitations are more fully described in the Second Amended and Restated Credit Agreement. As of September 30, 2021, the Company was in compliance with the specified total consolidated net leverage ratio range of 4.00 to 1.00.

The Second Amended and Restated Credit Agreement provides that events of default will exist in certain circumstances, including failure to make payment of principal or interest on the loans when required, failure to perform certain obligations under the Second Amended and Restated Credit Agreement and related documents including a failure to meet the maximum total consolidated net leverage ratio covenant, defaults under certain other indebtedness, certain insolvency events, certain events arising under ERISA, a change of control and certain other events. Upon an event of default, the administrative agent with the consent of, or at the request of, the holders of more than 50% in principal amount of the loans and commitments, may terminate the commitments and accelerate the maturity of the loans and enforce certain other remedies under the Second Amended and Restated Credit Agreement and the other loan documents.

The Company had unamortized capitalized debt issuance costs, net of $5.5 million at September 30, 2021, which are being amortized over the life of the revolving credit facility. The unamortized capitalized debt issuance costs balance of $1.1 million was included as prepaid expenses and other current assets and a balance of $4.4 million was included as other assets in the Company's consolidated balance sheet.

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LEASES

6 Months Ended

Sep. 30, 2021

Leases [Abstract]

LEASES

LEASES

The Company determines if an arrangement is a lease at inception. Right-of-use (ROU) assets represent the Company's right to use an underlying asset for the duration of the lease term. Lease liabilities represent the Company's contractual obligation to make lease payments over the lease term. ROU assets are recorded and recognized at commencement for the lease liability amount, plus initial direct costs incurred less lease incentives received. Lease liabilities are recorded at the present value of future lease payments over the lease term at commencement. The discount rate used is generally the Company's estimated incremental borrowing rate unless the lessor's implicit rate is readily determinable. Incremental borrowing rates are calculated periodically to estimate the rate the Company would pay to borrow the funds necessary to obtain an asset of similar value over a similar term. Lease expenses relating to operating leases are recognized on a straight-line basis over the lease term.

The Company has operating leases for administrative, research and development, sales and marketing and manufacturing facilities and equipment under various non-cancelable lease agreements. The Company's leases have remaining lease terms ranging from 1 year to 9 years. The Company's lease terms may include options to extend or terminate the lease where it is reasonably certain that the Company will exercise those options. The Company considers several economic factors when

making this determination, including but not limited to, the significance of leasehold improvements incurred in the office space, the difficulty in replacing the asset, underlying contractual obligations, or specific characteristics unique to a particular lease. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants.

Most of the Company's lease agreements contain variable payments, primarily for common area maintenance (CAM), which are expensed as incurred and not included in the measurement of the ROU assets and lease liabilities.

The components of operating lease cost for the three and six months ended September 30, 2021 and 2020 were as follows (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Lease cost under long-term operating leases	$	3,197	$	3,263	$	6,472	$	6,525
Lease cost under short-term operating leases	1,183		1,567		1,743		2,380
Variable lease cost under short-term and long-term operating leases	750		1,068		1,583		1,950
Total operating lease cost	$	5,130	$	5,898	$	9,798	$	10,855

The table below presents supplemental cash flow information related to leases during the six months ended September 30, 2021 and 2020 (in thousands):

	September 30, 2021		September 30, 2020
Right-of-use assets obtained in exchange for new operating lease liabilities	$	113	$	1,794

At September 30, 2021 and March 31, 2021, the weighted average remaining lease term in years and weighted average discount rate were as follows:

	September 30, 2021		March 31, 2021
Weighted average remaining lease term in years - operating leases	7.37		7.70
Weighted average discount rate - operating leases	4.1	%	4.1	%

Future minimum payments under non-cancellable leases at September 30, 2021 are as follows (in thousands):

Year ending March 31:
2022 (remaining six months)	$	6,654
2023	13,190
2024	10,549
2025	10,096
2026	9,086
Thereafter	29,285
Total lease payments	$	78,860
Less imputed interest	(10,724)
Present value of lease liabilities	$	68,136

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COMMITMENTS AND CONTINGENCIES

6 Months Ended

Sep. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

From time to time, NetScout is subject to legal proceedings and claims in the ordinary course of business. In the opinion of management, the amount of ultimate expense with respect to any current legal proceedings and claims, if determined adversely, will not have a material adverse effect on the Company's financial condition, results of operations or cash flows.

As previously disclosed, in March 2016, Packet Intelligence LLC (Packet Intelligence or Plaintiff) filed a Complaint against NetScout and two subsidiary entities in the United States District Court for the Eastern District of Texas asserting infringement of five United States patents. Plaintiff's Complaint alleged that legacy Tektronix GeoProbe products, including the G10 and GeoBlade products, infringed these patents. NetScout filed an Answer denying Plaintiff's allegations and asserting that Plaintiff's patents were, among other things, invalid, not infringed, and unenforceable due to inequitable conduct. In October

2017, a jury trial was held to address the parties' claims and counterclaims regarding infringement of three patents by the G10 and GeoBlade products, invalidity of these patents, and damages. On October 13, 2017, the jury rendered a verdict finding in favor of the Plaintiff and that Plaintiff was entitled to $3,500,000 for pre-suit damages and $2,250,000 for post-suit damages. The jury indicated that the awarded damages amounts were intended to reflect a running royalty. In September 2018, the Court entered judgment and "enhanced" the jury verdict in the amount of $2.8 million as a result of a jury finding. The judgment also awarded pre- and post-judgment interest, and a running royalty on the G10 and GeoBlade products until the expiration of the patents at issue, the last date being June 2022. Following the entry of final judgment, on June 12, 2019, NetScout filed its Notice of Appeal. On July 14, 2020, the Court of Appeals for the Federal Circuit issued a decision vacating the $3,500,000 pre-suit damages award, affirming the $2,250,000 post-suit damages award, and remanding to the district court to determine what, if any, enhancement should be awarded. On March 15, 2021, NetScout filed a petition for a writ of certiorari to the United States Supreme Court, which was subsequently denied, challenging, among other issues, the basis for enhanced damages and the patentability of the claimed technology. The case is currently on remand at the District Court for additional proceedings, including pending motions relating to whether enhanced damages should be awarded and the ongoing royalty rate. In addition, on September 8 and 9, 2021, in proceedings initiated by third parties that did not involve NetScout, the Patent Trial and Appeal Board (PTAB) invalidated all the patent claims that were also asserted against NetScout in this case. After the PTAB decisions were issued, NetScout moved to dismiss the case and enter judgment in its favor on the grounds that the PTAB decisions invalidating the asserted claims precluded Plaintiff from continuing to assert its patent infringement causes of action and from seeking damages from NetScout. Plaintiff has opposed the requested relief and is seeking review of the PTAB decisions. To date, there has been no decision from the United States Patent and Trademark Office Director regarding these decisions, and no appeal of them has been initiated with the Federal Circuit. In view of the current circumstances, NetScout has concluded that the risk of loss associated with the post-suit damages award remains "probable" in accounting terms, regardless of the options NetScout may pursue, and that the risk of loss associated with pre-suit damages is remote. Accounting rules require NetScout to provide an estimate for the range of potential liability. If the post-suit damages award survives the recent PTAB invalidation decisions, NetScout currently estimates that the range of liability would be the sum of post-suit damages, plus pre- and post-judgment interest amounts and royalties owed on post-trial sales of the accused G10 and GeoBlade products. Any potential enhancement of any such surviving post-suit damages award is not reasonably estimable but is likely within the range of $0 to $2,800,000.

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PENSION BENEFIT PLANS

6 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

PENSION BENEFIT PLANS

PENSION BENEFIT PLANS

Certain of the Company's non-U.S. employees participate in noncontributory defined benefit pension plans. None of the Company's employees in the U.S. participate in any noncontributory defined benefit pension plans. In general, these plans are funded based on considerations relating to legal requirements, underlying asset returns, the plan's funded status, the anticipated deductibility of the contribution, local practices, market conditions, interest rates and other factors.

The following sets forth the components of the Company's net periodic pension cost of the noncontributory defined benefit pension plans for the three and six months ended September 30, 2021 and 2020 (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Service cost	$	44	$	52	$	88	$	104
Interest cost	88		93		180		186
Net periodic pension cost	$	132	$	145	$	268	$	290

Expected Contributions

During the six months ended September 30, 2021, the Company made contributions of $0.2 million to its defined benefit pension plans. During the fiscal year ending March 31, 2022, the Company's cash contribution requirements for its defined benefit pension plans are expected to be less than $1.0 million. As a majority of the participants within the Company's plans are all active employees, the benefit payments are not expected to be material in the foreseeable future.

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TREASURY STOCK

6 Months Ended

Sep. 30, 2021

Equity [Abstract]

TREASURY STOCK

TREASURY STOCK

On October 24, 2017, the Company's Board of Directors approved a share repurchase program that enables the Company to repurchase up to twenty-five million shares of its common stock. This program became effective when the Company's previously disclosed twenty million share repurchase program was completed. The Company is not obligated to acquire any specific amount of common stock within any particular timeframe as a result of this share repurchase program. 

Through September 30, 2021, the Company repurchased 18,832,139 shares for $496.6 million in the open market under the twenty-five million share repurchase program. At September 30, 2021, 6,167,861 shares of common stock remained

available to be purchased under the current repurchase program. The Company repurchased 921,299 shares for $24.6 million under the twenty-five million share repurchase program during the six months ended September 30, 2021. There were no share repurchases during the six months ended September 30, 2020.

In connection with the delivery of shares of the Company's common stock upon vesting of restricted stock units, the Company withheld 523,539 shares and 481,739 shares at a cost of $15.0 million and $12.6 million, respectively, related to minimum statutory tax withholding requirements on these restricted stock units during the six months ended September 30, 2021 and 2020, respectively. These withholding transactions do not fall under the repurchase program described above, and therefore do not reduce the number of shares that are available for repurchase under that program.

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NET INCOME (LOSS) PER SHARE

6 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

NET INCOME (LOSS) PER SHARE

NET INCOME (LOSS) PER SHARE

Calculations of the basic and diluted net income (loss) per share and potential common shares are as follows (in thousands, except for per share data):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Numerator:
Net income (loss)	$	7,896	$	(3,686)	$	(3,445)	$	(21,106)
Denominator:
Denominator for basic net income (loss) per share - weighted average common shares outstanding	74,382		73,058		74,122		72,682
Dilutive common equivalent shares:
Weighted average restricted stock units and performance-based restricted stock units	711		—		—		—
Denominator for diluted net income (loss) per share - weighted average shares outstanding	75,093		73,058		74,122		72,682
Net income (loss) per share:
Basic net income (loss) per share	$	0.11	$	(0.05)	$	(0.05)	$	(0.29)
Diluted net income (loss) per share	$	0.11	$	(0.05)	$	(0.05)	$	(0.29)

The following table sets forth restricted stock units excluded from the calculation of diluted net income (loss) per share, since their inclusion would be anti-dilutive (in thousands):

	Three Months Ended		Six Months Ended
	September 30,		September 30,
	2021	2020	2021	2020
Restricted stock units	1,845	536	990	839

Basic net income (loss) per share is calculated by dividing net income (loss) by the weighted average number of shares outstanding during the period. Unvested restricted shares, although legally issued and outstanding, are not considered outstanding for purposes of calculating basic earnings per share. Diluted net income (loss) per share is calculated by dividing net income (loss) by the weighted average number of shares outstanding plus the dilutive effect, if any, of outstanding stock options, restricted shares and restricted stock units using the treasury stock method. The calculation of the dilutive effect of outstanding equity awards under the treasury stock method includes consideration of proceeds from the assumed exercise of stock options and unrecognized compensation expense as additional proceeds. As the Company incurred a net loss during the three months ended September 30, 2020 and during the six months ended September 30, 2021 and 2020, all outstanding restricted stock units and performance-based restricted stock units have an anti-dilutive effect and are therefore excluded from the computation of diluted weighted average shares outstanding.

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INCOME TAXES

6 Months Ended

Sep. 30, 2021

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

Generally, the Company's effective tax rate differs from the statutory tax rate primarily due to foreign withholding taxes, valuation allowances and US taxation on foreign earnings, which are partially offset by research and development tax credits, foreign tax credits and the foreign derived intangible income deduction.

The Company's effective tax rates were 19.7% and 1,057.4% for the three months ended September 30, 2021 and 2020, respectively. The effective tax rate for the three months ended September 30, 2021 differed from the effective tax rate for the three months ended September 30, 2020, primarily due to the impact of research and development tax credits, foreign tax

credits, the foreign derived intangible income deduction, foreign withholding taxes, and U.S. taxation on foreign earnings relative to forecasted profits, partially offset by discrete non-deductible stock compensation and the remeasurement of certain deferred taxes due to a change in enacted tax rate in the UK.The Company's effective tax rates were 5.7% and 11.8% for the six months ended September 30, 2021 and 2020, respectively. The effective tax rate for the six months ended September 30, 2021 differed from the effective tax rate for the six months ended September 30, 2020, primarily due to the impact of research and development tax credits, foreign tax credits, the foreign derived intangible income deduction, foreign withholding taxes, and U.S. taxation on foreign earnings relative to forecasted profits, partially offset by discrete non-deductible stock compensation.

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SEGMENT AND GEOGRAPHIC INFORMATION

6 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

SEGMENT AND GEOGRAPHIC INFORMATION

SEGMENT AND GEOGRAPHIC INFORMATION

The Company reports revenues and income under one reportable segment.

The Company manages its business in the following geographic areas: United States, Europe, Asia and the rest of the world. The Company's policies mandate compliance with economic sanctions and the export controls.

Total revenue by geography is as follows (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
United States	$	133,662	$	120,027	$	236,555	$	227,350
Europe	34,536		37,990		73,092		72,748
Asia	15,000		13,878		32,316		27,574
Rest of the world	28,720		33,444		60,227		61,482
	$	211,918	$	205,339	$	402,190	$	389,154

The United States revenue includes sales to resellers in the United States. These resellers fulfill customer orders and may subsequently ship the Company's products to international locations. Further, the Company determines the geography of its sales after considering where the contract originated. A majority of revenue attributable to locations outside of the United States is a result of export sales. Substantially all of the Company's identifiable assets are located in the United States.

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BASIS OF PRESENTATION (Policies)

6 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

BASIS OF PRESENTATION

The accompanying unaudited interim consolidated financial statements have been prepared by NetScout Systems, Inc. (NetScout or the Company). Certain information and footnote disclosures normally included in financial statements prepared under United States generally accepted accounting principles (GAAP) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). In the opinion of management, the unaudited interim consolidated financial statements include all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of the Company's financial position and stockholders' equity, results of operations and cash flows. The year-end consolidated balance sheet data and statement of stockholders' equity were derived from the Company's audited financial statements, but do not include all disclosures required by GAAP. The results reported in these unaudited interim consolidated financial statements are not necessarily indicative of results that may be expected for the entire year. All significant intercompany accounts and transactions are eliminated in consolidation.

These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements, including the notes thereto, included in the Company's Annual Report on Form 10-K for the fiscal year ended March 31, 2021 filed with the Securities and Exchange Commission on May 20, 2021.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments provide optional guidance for a limited time to ease the potential burden in accounting for reference rate reform. The new guidance provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts and hedging relationships that reference LIBOR or another reference rate expected to be discontinued due to reference rate reform. In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform, which clarifies the scope and application of certain optional expedients and exceptions regarding the original guidance. ASU 2021-01 may be applied prospectively through December 31, 2022. The expedients and exceptions provided by the amendments do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. The adoption is not expected to have a material impact on the Company's financial position, results of operations, and disclosures.

In January 2020, the FASB issued ASU 2020-01, Investments-Equity Securities (Topic 321), Investments-Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) - Clarifying the Interactions between Topic 321, Topic 323, and Topic 815. This guidance addresses accounting for the transition into and out of the equity method and provides clarification of the interaction of rules for equity securities, the equity method of accounting, and forward contracts and purchase options on certain types of securities. This standard is effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2020. The Company adopted the guidance as of April 1, 2021. The adoption did not have a material impact on the Company's consolidated financial statements.

In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes. ASU 2019-12 simplifies the accounting for income taxes, eliminates certain exceptions within ASC 740, Income Taxes, and clarifies certain aspects of the current guidance to promote consistency among reporting entities. ASU 2019-12 is effective for fiscal years beginning after December 15, 2020. The Company adopted the guidance as of April 1, 2021. The adoption did not have a material impact on the Company's consolidated financial statements.

Revenue Recognition Policy

Revenue Recognition Policy

The Company exercises judgment and uses estimates in connection with determining the amounts of product and service revenues to be recognized in each accounting period.

The Company derives revenues primarily from the sale of network management tools and security solutions for service provider and enterprise customers, which include hardware, software and service offerings. The Company's product sales consist of software only offerings and offerings which include hardware appliances with embedded software that are essential to providing customers the intended functionality of the solutions.

The Company accounts for revenue once a legally enforceable contract with a customer has been approved by the parties and the related promises to transfer products or services have been identified. A contract is defined by the Company as an arrangement with commercial substance identifying payment terms, each party’s rights and obligations regarding the products or services to be transferred and the amount the Company deems probable of collection. Customer contracts may include promises to transfer multiple products and services to a customer. Determining whether the products and services are considered distinct performance obligations that should be accounted for separately or as one combined performance obligation may require significant judgment. Revenue is recognized when control of the products or services are transferred to the Company's customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for products and services.

Product revenue is typically recognized upon shipment, provided a legally enforceable contract exists, control has passed to the customer, and in the case of software products, when the customer has the rights and ability to access the software, and collection of the related receivable is probable. If any significant obligations to the customer remain post-delivery, typically involving obligations relating to installation and acceptance by the customer, revenue recognition is deferred until such obligations have been fulfilled. The Company's service offerings include installation, integration, extended warranty and maintenance services, post-contract customer support, stand-ready software-as-a-service (SAAS) and other professional services including consulting and training. The Company generally provides software and/or hardware support as part of product sales. Revenue related to the initial bundled software and hardware support is recognized ratably over the support period. In addition, customers can elect to purchase extended support agreements for periods after the initial software/hardware warranty expiration. Support services generally include rights to unspecified upgrades (when and if available), telephone and internet-based support, updates, bug fixes and hardware repair and replacement. Consulting services are recognized upon delivery or completion of performance depending on the terms of the underlying contract. Reimbursements of out-of-pocket expenditures incurred in connection with providing consulting services are included in services revenue, with the offsetting expense recorded in cost of service revenue. Training services include on-site and classroom training. Training revenues are recognized upon delivery of the training.

Generally, the Company's contracts are accounted for individually. However, when contracts are closely interrelated and dependent on each other, it may be necessary to account for two or more contracts as one to reflect the substance of the group of contracts.

Bundled arrangements are concurrent customer purchases of a combination of the Company's product and service offerings that may be delivered at various points in time. The Company allocates the transaction price among the performance obligations in an amount that depicts the relative standalone selling prices (SSP) of each obligation. Judgment is required to determine the SSP for each distinct performance obligation. The Company uses a range of amounts to estimate SSP when it sells each of the products and services separately based on the element’s historical pricing. The Company also considers its overall pricing objectives and practices across different sales channels and geographies, and market conditions. Generally, the Company has established SSP for a majority of its service elements based on historical standalone sales. In certain instances,

the Company has established SSP for services based upon an estimate of profitability and the underlying cost to fulfill those services. Further, for certain service engagements, the Company considers quoted prices as part of multi-element arrangements of those engagements as a basis for establishing SSP. SSP has been established for product elements as the average or median selling price the element was recently sold for, whether sold alone or sold as part of a multiple element transaction. The Company reviews sales of the product elements on a quarterly basis and updates, when appropriate, its SSP for such elements to ensure that it reflects recent pricing experience. The Company's products are distributed through its direct sales force and indirect distribution channels through alliances with resellers and distributors. Revenue arrangements with resellers and distributors are recognized on a sell-in basis; that is, when control of the product transfers to the reseller or distributor. The Company records consideration given to a customer as a reduction of revenue to the extent they have recorded revenue from the customer. With limited exceptions, the Company's return policy does not allow product returns for a refund. Returns have been insignificant to date. In addition, the Company has a history of successfully collecting receivables from its resellers and distributors.

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REVENUE (Tables)

6 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Summary of Allowance for Credit Losses

The following table summarizes the activity in the allowance for credit losses (in thousands):

Balance at March 31, 2021	$	416
Recoveries and other adjustments	(1)
Write off charged against the allowance for credit losses	(17)
Balance at September 30, 2021	$	398

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SHARE-BASED COMPENSATION (Tables)

6 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Summary of Share-Based Compensation Expense

The following is a summary of share-based compensation expense including restricted stock units and performance-based restricted stock units granted pursuant to the Company's Amended 2007 Plan, the 2019 Plan, and the 2019 Amended Plan and employee stock purchases made under the Company's 2011 Employee Stock Purchase Plan, as amended, (ESPP), based on estimated fair values within the applicable cost and expense lines identified below (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Cost of product revenue	$	321	$	344	$	595	$	589
Cost of service revenue	1,907		1,810		3,520		3,160
Research and development	4,902		4,935		8,993		8,716
Sales and marketing	5,842		5,357		10,656		9,349
General and administrative	3,763		3,290		6,936		6,018
	$	16,735	$	15,736	$	30,700	$	27,832

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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, 2021		September 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, 2021		September 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 securities	7,347		—		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 paper	5,699		—		5,699
Total short-term marketable securities	9,270		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

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FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities

The following tables present the Company's financial assets and liabilities measured on a recurring basis using the fair value hierarchy at September 30, 2021 and March 31, 2021 (in thousands):

	Fair Value Measurements at
	September 30, 2021
	Level 1		Level 2		Level 3		Total
ASSETS:
Cash and cash equivalents	$	468,470	$	—	$	—	$	468,470
Commercial paper	—		7,347		—		$	7,347
Derivative financial instruments	—		9		—		9
	$	468,470	$	7,356	$	—	$	475,826
LIABILITIES:
Derivative financial instruments	$	—	$	(32)	$	—	$	(32)
	$	—	$	(32)	$	—	$	(32)

	Fair Value Measurements at
	March 31, 2021
	Level 1		Level 2		Level 3		Total
ASSETS:
Cash and cash equivalents	$	467,176	$	—	$	—	$	467,176
U.S. government and municipal obligations	2,539		1,039		—		3,578
Commercial paper	—		5,699		—		5,699
Derivative financial instruments	—		57		—		57
	$	469,715	$	6,795	$	—	$	476,510
LIABILITIES:
Derivative financial instruments	$	—	$	(191)	$	—	$	(191)
	$	—	$	(191)	$	—	$	(191)

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INVENTORIES (Tables)

6 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories consist of the following (in thousands):

	September 30, 2021		March 31, 2021
Raw materials	$	13,426	$	13,189
Work in process	763		16
Finished goods	6,139		6,168
Deferred costs	5,400		3,440
	$	25,728	$	22,813

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GOODWILL AND INTANGIBLE ASSETS (Tables)

6 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Goodwill

The following table summarizes the changes in the carrying amount of goodwill for the six months ended September 30, 2021 as follows (in thousands):

Balance at March 31, 2021	$	1,717,554
Foreign currency translation impact	316
Balance at September 30, 2021	$	1,717,870

Schedule of Intangible Assets

Intangible assets include the following amortizable intangible assets at September 30, 2021 (in thousands):

	Cost		Accumulated Amortization		Net
Developed technology	$	251,995	$	(219,320)	$	32,675
Customer relationships	775,625		(360,357)		415,268
Distributor relationships and technology licenses	11,465		(8,405)		3,060
Definite-lived trademark and trade name (a)	58,021		(34,825)		23,196
Core technology	7,192		(7,192)		—
Net beneficial leases	336		(336)		—
Non-compete agreements	292		(292)		—
Capitalized software	3,317		(3,303)		14
Other	1,208		(973)		235
	$	1,109,451	$	(635,003)	$	474,448

(a) The Company's $18.6 million acquired trade name changed from indefinite-lived during the first quarter of fiscal year 2022.

Intangible assets include the indefinite-lived trade name with a carrying value of $18.6 million and the following amortizable intangible assets at March 31, 2021 (in thousands):

	Cost		Accumulated Amortization		Net
Developed technology	$	252,071	$	(212,688)	$	39,383
Customer relationships	775,898		(333,903)		441,995
Distributor relationships and technology licenses	11,469		(7,829)		3,640
Definite-lived trademark and trade name	39,434		(31,467)		7,967
Core technology	7,192		(7,192)		—
Net beneficial leases	336		(336)		—
Non-compete agreements	292		(292)		—
Capitalized software	3,317		(3,281)		36
Other	1,208		(963)		245
	$	1,091,217	$	(597,951)	$	493,266

Finite-lived Intangible Assets Amortization Expense

The following table provides a summary of amortization expense for the three and six months ended September 30, 2021 and 2020, respectively (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Amortization of intangible assets included as:
Cost of product revenue	$	3,654	$	5,320	$	7,316	$	10,333
Operating expense	14,975		15,368		29,986		30,634
	$	18,629	$	20,688	$	37,302	$	40,967

Schedule of Expected Future Amortization Expense

The following is the expected future amortization expense at September 30, 2021 for the fiscal years ending March 31 (in thousands):

2022 (remaining six months)	$	37,158
2023	66,701
2024	58,455
2025	51,231
2026	46,878
Thereafter	214,025
	$	474,448

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Tables)

6 Months Ended

Sep. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of Notional Amounts and Fair Values of Derivative Instruments on Consolidated Balance Sheet

The notional amounts and fair values of derivative instruments in the consolidated balance sheets at September 30, 2021 and March 31, 2021 were as follows (in thousands):

	Notional Amounts (a)				Prepaid Expenses and Other Current Assets				Accrued Other
	September 30, 2021		March 31, 2021		September 30, 2021		March 31, 2021		September 30, 2021		March 31, 2021
Derivatives Designated as Hedging Instruments:
Forward contracts	$	1,792	$	11,037	$	9	$	57	$	32	$	152
Derivatives Not Designated as Hedging Instruments:
Forward contracts	—		6,373		—		—		—		39
					$	9	$	57	$	32	$	191

(a) Notional amounts represent the gross contract/notional amount of the derivatives outstanding.

Summary of Effect of Foreign Exchange Forward Contracts on OCI and Results of Operations

The following table provides the effect foreign exchange forward contracts designated as hedging instruments had on other comprehensive income (loss) (OCI) and results of operations for the three months ended September 30, 2021 and 2020 (in thousands):

	Gain (Loss) Recognized in OCI on Derivative (a)				Gain (Loss) Reclassified from Accumulated OCI into Income (b)
	September 30, 2021		September 30, 2020		Location	September 30, 2021		September 30, 2020
Forward contracts	$	(42)	$	236	Research and development	$	(6)	$	(22)
					Sales and marketing	46		(115)
	$	(42)	$	236		$	40	$	(137)

(a)The amount represents the change in fair value of derivative contracts due to changes in spot rates.

(b)The amount represents reclassification from other comprehensive income to earnings that occurs when the hedged item affects earnings.

The following table provides the effect foreign exchange forward contracts not designated as hedging instruments had on the Company's results of operations for the three months ended September 30, 2021 and 2020 (in thousands):

	Gain Recognized in Income (a)
	Location	September 30, 2021		September 30, 2020
Forward contracts	General and administrative	$	—	$	46
		$	—	$	46

(a)The amount represents the change in fair value of derivative contracts due to changes in spot rates.

The following table provides the effect foreign exchange forward contracts designated as hedging instruments had on other comprehensive income (loss) (OCI) and results of operations for the six months ended September 30, 2021 and 2020 (in thousands):

	Gain Recognized in OCI on Derivative (a)				Loss Reclassified from Accumulated OCI into Income (b)
	September 30, 2021		September 30, 2020		Location	September 30, 2021		September 30, 2020
Forward contracts	$	127	$	247	Research and development	$	(14)	$	(13)
					Sales and marketing	(51)		(81)
	$	127	$	247		$	(65)	$	(94)

(a)The amount represents the change in fair value of derivative contracts due to changes in spot rates.

(b)The amount represents reclassification from other comprehensive income to earnings that occurs when the hedged item affects earnings.

The following table provides the effect foreign exchange forward contracts not designated as hedging instruments had on the Company's results of operations for the six months ended September 30, 2021 and 2020 (in thousands):

	Gain Recognized in Income (a)
	Location	September 30, 2021		September 30, 2020
Forward contracts	General and administrative	$	—	$	46
		$	—	$	46

(a)The amount represents the change in fair value of derivative contracts due to changes in spot rates.

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LEASES (Tables)

6 Months Ended

Sep. 30, 2021

Leases [Abstract]

Components of Operating Lease Cost and Supplemental Cash Flow Information

The components of operating lease cost for the three and six months ended September 30, 2021 and 2020 were as follows (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Lease cost under long-term operating leases	$	3,197	$	3,263	$	6,472	$	6,525
Lease cost under short-term operating leases	1,183		1,567		1,743		2,380
Variable lease cost under short-term and long-term operating leases	750		1,068		1,583		1,950
Total operating lease cost	$	5,130	$	5,898	$	9,798	$	10,855

The table below presents supplemental cash flow information related to leases during the six months ended September 30, 2021 and 2020 (in thousands):

	September 30, 2021		September 30, 2020
Right-of-use assets obtained in exchange for new operating lease liabilities	$	113	$	1,794

At September 30, 2021 and March 31, 2021, the weighted average remaining lease term in years and weighted average discount rate were as follows:

	September 30, 2021		March 31, 2021
Weighted average remaining lease term in years - operating leases	7.37		7.70
Weighted average discount rate - operating leases	4.1	%	4.1	%

Future Minimum Payments Under Non-Cancellable Leases

Future minimum payments under non-cancellable leases at September 30, 2021 are as follows (in thousands):

Year ending March 31:
2022 (remaining six months)	$	6,654
2023	13,190
2024	10,549
2025	10,096
2026	9,086
Thereafter	29,285
Total lease payments	$	78,860
Less imputed interest	(10,724)
Present value of lease liabilities	$	68,136

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PENSION BENEFIT PLANS (Tables)

6 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Schedule of Net Periodic Pension Costs of Noncontributory Defined Benefit Pension Plans

The following sets forth the components of the Company's net periodic pension cost of the noncontributory defined benefit pension plans for the three and six months ended September 30, 2021 and 2020 (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Service cost	$	44	$	52	$	88	$	104
Interest cost	88		93		180		186
Net periodic pension cost	$	132	$	145	$	268	$	290

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NET INCOME (LOSS) PER SHARE (Tables)

6 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Schedule of Calculations of the Basic and Diluted Net Loss Per Share and Potential Common Shares

Calculations of the basic and diluted net income (loss) per share and potential common shares are as follows (in thousands, except for per share data):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Numerator:
Net income (loss)	$	7,896	$	(3,686)	$	(3,445)	$	(21,106)
Denominator:
Denominator for basic net income (loss) per share - weighted average common shares outstanding	74,382		73,058		74,122		72,682
Dilutive common equivalent shares:
Weighted average restricted stock units and performance-based restricted stock units	711		—		—		—
Denominator for diluted net income (loss) per share - weighted average shares outstanding	75,093		73,058		74,122		72,682
Net income (loss) per share:
Basic net income (loss) per share	$	0.11	$	(0.05)	$	(0.05)	$	(0.29)
Diluted net income (loss) per share	$	0.11	$	(0.05)	$	(0.05)	$	(0.29)

Summary of Antidilutive Securities Excluded from Computation of Diluted Loss Per Share

The following table sets forth restricted stock units excluded from the calculation of diluted net income (loss) per share, since their inclusion would be anti-dilutive (in thousands):

	Three Months Ended		Six Months Ended
	September 30,		September 30,
	2021	2020	2021	2020
Restricted stock units	1,845	536	990	839

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SEGMENT AND GEOGRAPHIC INFORMATION (Tables)

6 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Summary of Total Revenue by Geography

Total revenue by geography is as follows (in thousands):

	Three Months Ended				Six Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
United States	$	133,662	$	120,027	$	236,555	$	227,350
Europe	34,536		37,990		73,092		72,748
Asia	15,000		13,878		32,316		27,574
Rest of the world	28,720		33,444		60,227		61,482
	$	211,918	$	205,339	$	402,190	$	389,154

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BASIS OF PRESENTATION - Narrative (Details) $ in Millions	Sep. 30, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Deferred employer payroll taxes	$ 8.9
Accrued Liabilities
Summary Of Significant Accounting Policies [Line Items]
Deferred employer payroll taxes	4.5
Other Noncurrent Liabilities
Summary Of Significant Accounting Policies [Line Items]
Deferred employer payroll taxes	4.4
Senior Secured Revolving Credit Facility | Line of Credit
Summary Of Significant Accounting Policies [Line Items]
Current borrowing capacity	$ 450.0

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REVENUE - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue recognized			$ 168.4
Deferred revenue	$ 349.2		349.2
Unrecognized accounts receivable and deferred revenue	8.9		8.9		$ 7.1
Capitalized contract cost	7.3		7.3		7.4
Amortization of capitalized costs to obtain contracts	1.5	$ 1.5	3.1	$ 3.1
Prepaid Expenses and Other Current Assets
Disaggregation of Revenue [Line Items]
Capitalized contract cost	4.1		4.1		4.1
Other Assets
Disaggregation of Revenue [Line Items]
Capitalized contract cost	$ 3.2		$ 3.2		$ 3.3
Minimum
Disaggregation of Revenue [Line Items]
Payment terms			30 days
Maximum
Disaggregation of Revenue [Line Items]
Payment terms			90 days

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REVENUE - Performance Obligations (Details) $ in Millions	Sep. 30, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, amount	$ 246.7
Revenue, remaining performance obligation, percentage	71.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, amount	$ 102.5
Revenue, remaining performance obligation, percentage	29.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period

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REVENUE - Allowance for Credit Losses (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2021 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	$ 416
Recoveries and other adjustments	(1)
Write off charged against the allowance for credit losses	(17)
Allowance for credit losses, ending balance	$ 398

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SHARE-BASED COMPENSATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 16,735	$ 15,736	$ 30,700	$ 27,832
Cost of product revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	321	344	595	589
Cost of service revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	1,907	1,810	3,520	3,160
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	4,902	4,935	8,993	8,716
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	5,842	5,357	10,656	9,349
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 3,763	$ 3,290	$ 6,936	$ 6,018

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SHARE-BASED COMPENSATION - Narrative (Details) - $ / shares		6 Months Ended	12 Months Ended
	Sep. 10, 2020	Sep. 30, 2021	Mar. 31, 2021
ESPP
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Percentage of common stock price for employees			85.00%
Shares purchased by employees under ESPP (in shares)		251,308
Share price (in dollars per share)		$ 23.31
Performance Based Restricted Stock Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award performance measurement period		3 years
2019 Equity Incentive Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of new shares (in shares)	4,700,000
2019 Equity Incentive Plan | Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based awards generally vesting years	1 year

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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND MARKETABLE SECURITIES - Summary of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Cash and cash equivalents	$ 468,470	$ 467,176	$ 415,719	$ 338,489
Restricted cash	0	0	748	1,748
Total cash, cash equivalents and restricted cash	$ 468,470	$ 467,176	$ 416,467	$ 340,237

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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND MARKETABLE SECURITIES - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 7,347	$ 9,270
Unrealized Gains	0	7
Fair Value	7,347	9,277
Short-term Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,347	9,270
Unrealized Gains	0	7
Fair Value	7,347	9,277
Short-term Marketable Securities | U.S. government and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		3,571
Unrealized Gains		7
Fair Value		3,578
Short-term Marketable Securities | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,347	5,699
Unrealized Gains	0	0
Fair Value	7,347	5,699
Long-term Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0	0
Unrealized Gains	0	0
Fair Value	$ 0	$ 0

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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND MARKETABLE SECURITIES - Summary of Contractual Maturities of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Available-for-sale securities:
Due in 1 year or less	$ 7,347	$ 9,277
Due after 1 year through 5 years	0	0
Available-for-sale Securities	$ 7,347	$ 9,277

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FAIR VALUE MEASUREMENTS - Schedule of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
ASSETS:
Cash and cash equivalents	$ 468,470	$ 467,176
Available-for-sale securities	7,347	9,277
Derivative financial instruments	9	57
Total assets	475,826	476,510
LIABILITIES:
Derivative financial instruments	(32)	(191)
Total liabilities	(32)	(191)
U.S. government and municipal obligations
ASSETS:
Available-for-sale securities		3,578
Commercial paper
ASSETS:
Available-for-sale securities	7,347	5,699
Level 1
ASSETS:
Cash and cash equivalents	468,470	467,176
Derivative financial instruments	0	0
Total assets	468,470	469,715
LIABILITIES:
Derivative financial instruments	0	0
Total liabilities	0	0
Level 1 | U.S. government and municipal obligations
ASSETS:
Available-for-sale securities		2,539
Level 1 | Commercial paper
ASSETS:
Available-for-sale securities	0	0
Level 2
ASSETS:
Cash and cash equivalents	0	0
Derivative financial instruments	9	57
Total assets	7,356	6,795
LIABILITIES:
Derivative financial instruments	(32)	(191)
Total liabilities	(32)	(191)
Level 2 | U.S. government and municipal obligations
ASSETS:
Available-for-sale securities		1,039
Level 2 | Commercial paper
ASSETS:
Available-for-sale securities	7,347	5,699
Level 3
ASSETS:
Cash and cash equivalents	0	0
Derivative financial instruments	0	0
Total assets	0	0
LIABILITIES:
Derivative financial instruments	0	0
Total liabilities	0	0
Level 3 | U.S. government and municipal obligations
ASSETS:
Available-for-sale securities		0
Level 3 | Commercial paper
ASSETS:
Available-for-sale securities	$ 0	$ 0

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INVENTORIES (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 13,426	$ 13,189
Work in process	763	16
Finished goods	6,139	6,168
Deferred costs	5,400	3,440
Total inventories	$ 25,728	$ 22,813

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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2021 USD ($) reporting_unit	Mar. 31, 2021 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Number of reporting units | reporting_unit	1
Goodwill	$ 1,717,870	$ 1,717,554
Carrying value of intangible assets	$ 474,448	511,866
Weighted average useful life of acquired intangible assets	14 years 7 months 6 days
Cost	$ 1,109,451	1,091,217
Trade Name
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 18,600
Weighted average useful life of acquired intangible assets	8 years
Developed and Core Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life of acquired intangible assets	11 years 2 months 12 days
Customer and Distributor Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life of acquired intangible assets	15 years 10 months 24 days
Trademarks and Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life of acquired intangible assets	8 years 4 months 24 days
Cost	$ 58,021	39,434
Capitalized Software
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life of acquired intangible assets	3 years
Cost	$ 3,317	3,317
Trade Name
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets carrying value		$ 18,600

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GOODWILL AND INTANGIBLE ASSETS - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2021 USD ($)
Goodwill [Roll Forward]
Balance at March 31, 2021	$ 1,717,554
Foreign currency translation impact	316
Balance at September 30, 2021	$ 1,717,870

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GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,109,451	$ 1,091,217
Accumulated Amortization	(635,003)	(597,951)
Net	474,448	493,266
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	251,995	252,071
Accumulated Amortization	(219,320)	(212,688)
Net	32,675	39,383
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	775,625	775,898
Accumulated Amortization	(360,357)	(333,903)
Net	415,268	441,995
Distributor relationships and technology licenses
Finite-Lived Intangible Assets [Line Items]
Cost	11,465	11,469
Accumulated Amortization	(8,405)	(7,829)
Net	3,060	3,640
Definite-lived trademark and trade name
Finite-Lived Intangible Assets [Line Items]
Cost	58,021	39,434
Accumulated Amortization	(34,825)	(31,467)
Net	23,196	7,967
Core technology
Finite-Lived Intangible Assets [Line Items]
Cost	7,192	7,192
Accumulated Amortization	(7,192)	(7,192)
Net	0	0
Net beneficial leases
Finite-Lived Intangible Assets [Line Items]
Cost	336	336
Accumulated Amortization	(336)	(336)
Net	0	0
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Cost	292	292
Accumulated Amortization	(292)	(292)
Net	0	0
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Cost	3,317	3,317
Accumulated Amortization	(3,303)	(3,281)
Net	14	36
Other
Finite-Lived Intangible Assets [Line Items]
Cost	1,208	1,208
Accumulated Amortization	(973)	(963)
Net	$ 235	$ 245

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GOODWILL AND INTANGIBLE ASSETS - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 18,629	$ 20,688	$ 37,302	$ 40,967
Cost of product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	3,654	5,320	7,316	10,333
Operating expense
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 14,975	$ 15,368	$ 29,986	$ 30,634

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GOODWILL AND INTANGIBLE ASSETS - Schedule of Expected Future Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2022 (remaining six months)	$ 37,158
2023	66,701
2024	58,455
2025	51,231
2026	46,878
Thereafter	214,025
Net	$ 474,448	$ 493,266

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)	6 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Managing period of hedging forecasted cash flows for operating expenses denominated in foreign currencies	12 months
Contract maturity period	12 months

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Summary of Notional Amounts and Fair Values of Derivative Instruments on Consolidated Balance Sheet (Details) - Forward contracts - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Prepaid Expenses and Other Current Assets	$ 9	$ 57
Accrued Other
Derivatives, Fair Value [Line Items]
Accrued Other	32	191
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Amounts	1,792	11,037
Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Prepaid Expenses and Other Current Assets	9	57
Designated as Hedging Instrument | Accrued Other
Derivatives, Fair Value [Line Items]
Accrued Other	32	152
Designated as not Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Amounts	0	6,373
Designated as not Hedging Instrument | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Prepaid Expenses and Other Current Assets	0	0
Designated as not Hedging Instrument | Accrued Other
Derivatives, Fair Value [Line Items]
Accrued Other	$ 0	$ 39

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Summary of Effect of Foreign Exchange Forward Contracts on Other Comprehensive Income and Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
General and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Gain on derivative	$ 0	$ 46	$ 0	$ 46
Forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	(42)	236	127	247
Gain (Loss) Reclassified from Accumulated OCI into Income	40	(137)	(65)	(94)
Forward contracts | Research and development
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	(42)	236	127	247
Gain (Loss) Reclassified from Accumulated OCI into Income	(6)	(22)	(14)	(13)
Forward contracts | Sales and marketing
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income	46	(115)	(51)	(81)
Forward contracts | General and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Gain on derivative	$ 0	$ 46	$ 0	$ 46

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LONG-TERM DEBT- Narrative (Details)			3 Months Ended	6 Months Ended
	Jul. 27, 2021 USD ($)	Jan. 16, 2018 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Debt Instrument [Line Items]
Repaid borrowings	$ 350,000,000
Loss on extinguishment of debt				$ 596,000	$ 0
Senior Secured Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt term	5 years	5 years
Credit facility	$ 800,000,000	$ 1,000,000,000
Loss on extinguishment of debt			$ 600,000	600,000
Amount outstanding under credit facility			$ 350,000,000	$ 350,000,000
Adjusted consolidated EBITDA percentage				125.00%
Commitment fee percentage				0.20%
Maximum leverage ratio			4.00	4.00
Debt default, acceleration clause, required consent percentage	50.00%
Unamortized debt issuance costs			$ 5,500,000	$ 5,500,000
Senior Secured Revolving Credit Facility | Line of Credit | Prepaid Expenses and Other Current Assets
Debt Instrument [Line Items]
Unamortized debt issuance costs			1,100,000	1,100,000
Senior Secured Revolving Credit Facility | Line of Credit | Other Assets
Debt Instrument [Line Items]
Unamortized debt issuance costs			$ 4,400,000	$ 4,400,000
Senior Secured Revolving Credit Facility | Line of Credit | Maximum
Debt Instrument [Line Items]
Leverage ratio			3.50	3.50
Commitment fee percentage				0.30%
Senior Secured Revolving Credit Facility | Line of Credit | Maximum | Foreign Subsidiaries
Debt Instrument [Line Items]
Voting stock pledge limit for any foreign subsidiary		65.00%
Senior Secured Revolving Credit Facility | Line of Credit | Minimum
Debt Instrument [Line Items]
Leverage ratio			1.50	1.50
Commitment fee percentage				0.15%
Senior Secured Revolving Credit Facility | Line of Credit | Federal Funds Effective Rate
Debt Instrument [Line Items]
Interest rate in excess of effective rate	0.50%
Senior Secured Revolving Credit Facility | Line of Credit | LIBOR
Debt Instrument [Line Items]
Interest rate in excess of effective rate	1.00%
Senior Secured Revolving Credit Facility | Line of Credit | LIBOR | LIBOR Loans
Debt Instrument [Line Items]
Interest rate in excess of effective rate				1.25%
Senior Secured Revolving Credit Facility | Line of Credit | LIBOR | LIBOR Loans | Maximum
Debt Instrument [Line Items]
Interest rate in excess of effective rate				2.00%
Senior Secured Revolving Credit Facility | Line of Credit | LIBOR | LIBOR Loans | Minimum
Debt Instrument [Line Items]
Interest rate in excess of effective rate				1.00%
Senior Secured Revolving Credit Facility | Line of Credit | Base Rate | Base Rate Loans
Debt Instrument [Line Items]
Interest rate in excess of effective rate				0.25%
Senior Secured Revolving Credit Facility | Line of Credit | Base Rate | Base Rate Loans | Maximum
Debt Instrument [Line Items]
Interest rate in excess of effective rate				1.00%
Senior Secured Revolving Credit Facility | Line of Credit | Base Rate | Base Rate Loans | Minimum
Debt Instrument [Line Items]
Interest rate in excess of effective rate				0.00%
Letter of Credit Sub-facility | Line of Credit
Debt Instrument [Line Items]
Credit facility	$ 75,000,000	$ 75,000,000
Senior Secured Revolving Credit Facility Leverage Ratio Terms Two | Line of Credit | Maximum
Debt Instrument [Line Items]
Leverage ratio			2.75	2.75
Senior Secured Revolving Credit Facility Leverage Ratio Terms Two | Line of Credit | Minimum
Debt Instrument [Line Items]
Leverage ratio			1.50	1.50

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LEASES - Narrative (Details)	Sep. 30, 2021
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining lease terms	1 year
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining lease terms	9 years

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LEASES - Operating Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Lease cost under long-term operating leases	$ 3,197	$ 3,263	$ 6,472	$ 6,525
Lease cost under short-term operating leases	1,183	1,567	1,743	2,380
Variable lease cost under short-term and long-term operating leases	750	1,068	1,583	1,950
Total operating lease cost	$ 5,130	$ 5,898	$ 9,798	$ 10,855

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LEASES - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021
Leases [Abstract]
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 113	$ 1,794
Weighted average remaining lease term in years - operating leases	7 years 4 months 13 days		7 years 8 months 12 days
Weighted average discount rate - operating leases	4.10%		4.10%

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LEASES - Future Minimum Payments Under Non-Cancellable Leases (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Leases [Abstract]
2022 (remaining six months)	$ 6,654
2023	13,190
2024	10,549
2025	10,096
2026	9,086
Thereafter	29,285
Total lease payments	78,860
Less imputed interest	(10,724)
Present value of lease liabilities	$ 68,136

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COMMITMENTS AND CONTINGENCIES - Narrative (Details)			1 Months Ended
	Jul. 14, 2020 USD ($)	Oct. 13, 2017 USD ($)	Sep. 30, 2018 USD ($)	Oct. 31, 2017 patent	Mar. 31, 2016 patent subsidiary	Sep. 30, 2021 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Number of subsidiary entities | subsidiary					2
Number of patents allegedly infringed | patent				3	5
Damages sought			$ 2,800,000
Minimum
Commitments and Contingencies Disclosure [Line Items]
Estimate of potential enhancement						$ 0
Maximum
Commitments and Contingencies Disclosure [Line Items]
Estimate of potential enhancement						$ 2,800,000
Pre-suit Damages
Commitments and Contingencies Disclosure [Line Items]
Damages sought	$ 3,500,000	$ 3,500,000
Post-suit Damages
Commitments and Contingencies Disclosure [Line Items]
Damages sought	$ 2,250,000	$ 2,250,000

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PENSION BENEFIT PLANS - Narrative (Details) $ in Millions	6 Months Ended
	Sep. 30, 2021 USD ($) employee
Defined Benefit Plan Disclosure [Line Items]
Contributions to defined benefit pension plans	$ 0.2
Expected cash contribution requirements for defined benefit pension plans, less than	$ 1.0
United States
Defined Benefit Plan Disclosure [Line Items]
Number of employees participating in noncontributory defined benefit pension plans | employee	0

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PENSION BENEFIT PLANS - Net Periodic Pension Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Retirement Benefits [Abstract]
Service cost	$ 44	$ 52	$ 88	$ 104
Interest cost	88	93	180	186
Net periodic pension cost	$ 132	$ 145	$ 268	$ 290

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TREASURY STOCK- Narrative (Details) - USD ($) $ in Millions	6 Months Ended		47 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Oct. 24, 2017	Oct. 23, 2017
Equity, Class of Treasury Stock [Line Items]
Stock authorized to repurchase under stock repurchase program (in shares)					20,000,000
Restricted Stock Units
Equity, Class of Treasury Stock [Line Items]
Shares paid for tax withholding (in shares)	523,539	481,739
Cost related to tax withholding	$ 15.0	$ 12.6
Share Repurchase Program, October 2017
Equity, Class of Treasury Stock [Line Items]
Stock authorized to repurchase under stock repurchase program (in shares)	25,000,000		25,000,000	25,000,000
Shares repurchased during the period (in shares)	921,299	0	18,832,139
Value of shares repurchased	$ 24.6		$ 496.6
Stock remaining to be purchased (in shares)	6,167,861		6,167,861

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NET INCOME (LOSS) PER SHARE - Schedule of Calculations of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income (loss)	$ 7,896	$ (3,686)	$ (3,445)	$ (21,106)
Denominator:
Denominator for basic net income (loss) per share - weighted average common shares outstanding (in shares)	74,382	73,058	74,122	72,682
Dilutive common equivalent shares:
Weighted average restricted stock units and performance based restricted stock units (in shares)	711	0	0	0
Denominator for diluted net income (loss) per share - weighted average shares outstanding (in shares)	75,093	73,058	74,122	72,682
Net income (loss) per share:
Basic net income (loss) per share (in dollars per share)	$ 0.11	$ (0.05)	$ (0.05)	$ (0.29)
Diluted net income (loss) per share (in dollars per share)	$ 0.11	$ (0.05)	$ (0.05)	$ (0.29)

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NET INCOME (LOSS) PER SHARE - Antidilutive Securities Excluded from Computation (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	1,845	536	990	839

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INCOME TAXES - Narrative (Details)	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate	19.70%	1057.40%	5.70%	11.80%

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SEGMENT AND GEOGRAPHIC INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Segment	Sep. 30, 2020 USD ($)
Segment Reporting [Abstract]
Number of segments | Segment			1
Segment Reporting Information [Line Items]
Total revenue	$ 211,918	$ 205,339	$ 402,190	$ 389,154
United States
Segment Reporting Information [Line Items]
Total revenue	133,662	120,027	236,555	227,350
Europe
Segment Reporting Information [Line Items]
Total revenue	34,536	37,990	73,092	72,748
Asia
Segment Reporting Information [Line Items]
Total revenue	15,000	13,878	32,316	27,574
Rest of the world
Segment Reporting Information [Line Items]
Total revenue	$ 28,720	$ 33,444	$ 60,227	$ 61,482