Pure Storage (PSTG) 10-Q 11 Sep 20 2020 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Aug. 02, 2020	Sep. 07, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Aug. 2, 2020
Document Transition Report	false
Entity File Number	001-37570
Entity Registrant Name	Pure Storage, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-1069557
Entity Address, Address Line One	650 Castro Street,
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	Mountain View
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94041
City Area Code	800
Local Phone Number	379-7873
Title of 12(b) Security	Class A Common Stock, $0.0001 par value per share
Trading Symbol	PSTG
Security Exchange Name	NYSE
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)		268,213,465
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001474432
Current Fiscal Year End Date	--01-31

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Aug. 02, 2020	Feb. 02, 2020
Current assets:
Cash and cash equivalents	$ 355,601	$ 362,635
Marketable securities	937,514	936,518
Accounts receivable, net of allowance of $542 and $587	366,698	458,643
Inventory	36,363	38,518
Deferred commissions, current	39,507	37,148
Prepaid expenses and other current assets	76,701	56,930
Total current assets	1,812,384	1,890,392
Property and equipment, net	145,126	122,740
Operating lease right-of-use assets	121,576	112,854
Deferred commissions, non-current	105,180	102,056
Intangible assets, net	52,855	58,257
Goodwill	37,584	37,584
Restricted cash	15,287	15,287
Other assets, non-current	31,620	25,034
Total assets	2,321,612	2,364,204
Current liabilities:
Accounts payable	56,366	77,651
Accrued compensation and benefits	96,438	106,592
Accrued expenses and other liabilities	46,818	47,223
Operating lease liabilities, current	29,517	27,264
Deferred revenue, current	378,072	356,011
Total current liabilities	607,211	614,741
Convertible senior notes, net	491,132	477,007
Operating lease liabilities, non-current	109,606	92,977
Deferred revenue, non-current	346,679	341,277
Other liabilities, non-current	20,878	8,084
Total liabilities	1,575,506	1,534,086
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock, par value of $0.0001 per share— 20,000 shares authorized; no shares issued and outstanding	0	0
Class A and Class B common stock, par value of $0.0001 per share—2,250,000 (Class A 2,000,000, Class B 250,000) shares authorized; 264,008 and 267,776 Class A shares issued and outstanding	27	26
Additional paid-in capital	2,172,391	2,107,579
Accumulated other comprehensive income	12,185	5,449
Accumulated deficit	(1,438,497)	(1,282,936)
Total stockholders’ equity	746,106	830,118
Total liabilities and stockholders’ equity	$ 2,321,612	$ 2,364,204

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Aug. 02, 2020	Feb. 02, 2020
Accounts receivable, allowance	$ 587	$ 542
Preferred stock
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Shares authorized (in shares)	20,000,000	20,000,000
Shares issued (in shares)	0	0
Shares outstanding (in shares)	0	0
Common stock
Shares authorized (in shares)	2,250,000,000	2,250,000,000
Class A
Common stock
Par value per share (in dollars per share)	$ 0.0001	$ 0.0001
Shares authorized (in shares)	2,000,000,000	2,000,000,000
Shares issued (in shares)	267,776,462	264,008,000
Shares outstanding (in shares)	267,776,462	264,008,000
Class B
Common stock
Par value per share (in dollars per share)	$ 0.0001	$ 0.0001
Shares authorized (in shares)	250,000,000	250,000,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Revenue	$ 403,723	$ 396,327	$ 770,842	$ 723,027
Cost of revenue	128,997	128,008	239,291	238,321
Gross profit	274,726	268,319	531,551	484,706
Operating expenses:
Research and development	114,652	107,020	227,098	212,095
Sales and marketing	171,434	186,188	344,867	352,814
General and administrative	44,471	40,016	85,596	82,126
Restructuring and other	8,288	0	22,990	0
Total operating expenses	338,845	333,224	680,551	647,035
Loss from operations	(64,119)	(64,905)	(149,000)	(162,329)
Other income (expense), net	1,603	(652)	(1,813)	(2,468)
Loss before provision for income taxes	(62,516)	(65,557)	(150,813)	(164,797)
Provision for income taxes	2,451	461	4,748	1,557
Net loss	$ (64,967)	$ (66,018)	$ (155,561)	$ (166,354)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.25)	$ (0.26)	$ (0.59)	$ (0.67)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	264,799	251,298	263,867	248,336
Product
Revenue	$ 272,309	$ 300,128	$ 519,248	$ 538,869
Cost of revenue	84,731	92,870	154,016	169,462
Subscription services
Revenue	131,414	96,199	251,594	184,158
Cost of revenue	$ 44,266	$ 35,138	$ 85,275	$ 68,859

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (64,967)	$ (66,018)	$ (155,561)	$ (166,354)
Other comprehensive income net of tax:
Unrealized net gains on available-for-sale securities	2,715	2,173	7,605	3,798
Less: reclassification adjustment for net gains on available-for-sale securities included in net loss	(703)	(53)	(869)	(51)
Change in unrealized net gains on available-for-sale securities	2,012	2,120	6,736	3,747
Comprehensive loss	$ (62,955)	$ (63,898)	$ (148,825)	$ (162,607)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders’ Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Restricted Stock UnitsCommon Stock	Restricted Stock UnitsAdditional Paid-In Capital	Restricted StockCommon Stock
Beginning balance (in shares) at Jan. 31, 2019		243,524
Beginning balance at Jan. 31, 2019	$ 737,780	$ 24	$ 1,820,043	$ (338)	$ (1,081,949)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		3,863
Issuance of common stock upon exercise of stock options	19,291	$ 1	19,290
Additional Paid-in Capital	118,206		118,206
Vesting of restricted stock units (in shares)						4,327
Vesting of restricted stock units	0					$ 1	$ (1)
Net issuance of restricted stock (in shares)								1,065
Restricted stock settlement, taxes paid	(7,173)		(7,173)
Common stock issued under employee stock purchase plan (in shares)		2,973
Common stock issued under employee stock purchase plan	32,042		32,042
Other comprehensive income (loss)	3,747			3,747
Net loss	(166,354)				(166,354)
Ending balance (in shares) at Jul. 31, 2019		255,752
Ending balance at Jul. 31, 2019	737,539	$ 26	1,982,407	3,409	(1,248,303)
Beginning balance (in shares) at Apr. 30, 2019		252,853
Beginning balance at Apr. 30, 2019	743,976	$ 25	1,924,947	1,289	(1,182,285)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		655
Issuance of common stock upon exercise of stock options	2,502	$ 0	2,502
Additional Paid-in Capital	56,460		56,460
Vesting of restricted stock units (in shares)						2,277
Vesting of restricted stock units						$ 1	(1)
Net issuance of restricted stock (in shares)		33
Restricted stock settlement, taxes paid	(1,501)		(1,501)
Other comprehensive income (loss)	2,120			2,120
Net loss	(66,018)				(66,018)
Ending balance (in shares) at Jul. 31, 2019		255,752
Ending balance at Jul. 31, 2019	737,539	$ 26	1,982,407	3,409	(1,248,303)
Beginning balance (in shares) at Feb. 02, 2020		264,008
Beginning balance at Feb. 02, 2020	830,118	$ 26	2,107,579	5,449	(1,282,936)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		4,313
Issuance of common stock upon exercise of stock options	21,626	$ 1	21,625
Additional Paid-in Capital	120,150		120,150
Vesting of restricted stock units (in shares)						5,455
Vesting of restricted stock units						$ 1	(1)
Net issuance of restricted stock (in shares)								(230)
Tax withholding on vesting of restricted stock (in shares)		(219)
Restricted stock settlement, taxes paid	(2,841)		(2,841)
Common stock issued under employee stock purchase plan (in shares)		1,585
Common stock issued under employee stock purchase plan	16,021		16,021
Repurchase of common stock (in shares)		(7,136)
Repurchase of common stock	(90,143)		(90,142)			$ (1)
Other comprehensive income (loss)	6,736			6,736
Net loss	(155,561)				(155,561)
Ending balance (in shares) at Aug. 02, 2020		267,776
Ending balance at Aug. 02, 2020	746,106	$ 27	2,172,391	12,185	(1,438,497)
Beginning balance (in shares) at May. 03, 2020		263,970
Beginning balance at May. 03, 2020	756,858	$ 26	2,120,189	10,173	(1,373,530)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		2,138
Issuance of common stock upon exercise of stock options	12,238	$ 1	12,237
Additional Paid-in Capital	61,456		61,456
Vesting of restricted stock units (in shares)						2,930
Vesting of restricted stock units						$ 1	$ (1)
Tax withholding on vesting of restricted stock (in shares)		(85)
Restricted stock settlement, taxes paid	(1,467)		(1,467)
Repurchase of common stock (in shares)		(1,177)
Repurchase of common stock	(20,024)		(20,023)			$ (1)
Other comprehensive income (loss)	2,012			2,012
Net loss	(64,967)				(64,967)
Ending balance (in shares) at Aug. 02, 2020		267,776
Ending balance at Aug. 02, 2020	$ 746,106	$ 27	$ 2,172,391	$ 12,185	$ (1,438,497)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (155,561)	$ (166,354)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	31,597	43,591
Amortization of debt discount and debt issuance costs	14,125	13,290
Stock-based compensation expense	120,146	120,561
Impairment of long-lived assets	7,505	0
Other	1,972	327
Changes in operating assets and liabilities, net of effects of acquisition:
Accounts receivable, net	91,896	26,553
Inventory	1,735	6,852
Deferred commissions	(5,483)	(3,595)
Prepaid expenses and other assets	(26,389)	(635)
Operating lease right-of-use assets	14,181	13,438
Accounts payable	(21,090)	(30,827)
Accrued compensation and other liabilities	(3,217)	(25,704)
Operating lease liabilities	(13,071)	(13,083)
Deferred revenue	27,463	71,045
Net cash provided by operating activities	85,809	55,459
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(48,776)	(53,229)
Acquisition, net of cash acquired	0	(47,881)
Purchase of intangible assets	0	(9,000)
Purchases of marketable securities	(291,237)	(488,497)
Sales of marketable securities	91,351	60,368
Maturities of marketable securities	206,174	270,756
Net cash used in investing activities	(42,488)	(267,483)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from exercise of stock options	21,658	19,260
Proceeds from issuance of common stock under employee stock purchase plan	16,021	32,042
Proceeds from borrowing	4,950	0
Repayment of debt assumed from acquisition	0	(11,555)
Tax withholding on vesting of restricted stock	(2,841)	(7,173)
Repurchases of common stock	(90,143)	0
Net cash provided by (used in) financing activities	(50,355)	32,574
Net decrease in cash, cash equivalents and restricted cash	(7,034)	(179,450)
Cash, cash equivalents and restricted cash, beginning of period	377,922	463,813
Cash, cash equivalents and restricted cash, end of period	370,888	284,363
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest	359	359
Cash paid for income taxes	5,070	2,716
Cash paid for amounts included in the measurement of lease liabilities	17,849	16,167
Property and equipment purchased but not yet paid	6,619	5,717
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	$ 29,754	$ 3,449

Condensed Consolidated Statem_5

Condensed Consolidated Statement of Cash Flows (Parenthetical) - USD ($) $ in Thousands	Aug. 02, 2020	Jul. 31, 2019
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND CASH EQUIVALENTS AT END OF PERIOD
Cash and cash equivalents	$ 355,601	$ 268,938
Restricted cash	15,287	15,425
Cash, cash equivalents and restricted cash, end of period	$ 370,888	$ 284,363

Business Overview

Business Overview	6 Months Ended
	Aug. 02, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Overview	Business Overview Organization and Description of Business Pure Storage, Inc. (the Company, we, us, or other similar pronouns) was originally incorporated in the state of Delaware in October 2009 under the name OS76, Inc. In January 2010, we changed our name to Pure Storage, Inc. We are headquartered in Mountain View, California and have wholly owned subsidiaries throughout the world. Data is foundational to our customers' digital transformation and we are focused on delivering innovative and disruptive technology and data storage solutions that enable customers to maximize the value of their data. We started with the vision of making flash storage available to enterprise organizations everywhere and established an entirely new customer experience including our innovative Evergreen Storage subscription that radically simplified storage ownership and reduced total cost of ownership for our customers. Our solutions serve data workloads on-premise, in the cloud, or hybrid environments and include mission-critical production, test/development, analytics, disaster recovery, and backup/recovery.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Aug. 02, 2020
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Principles of Consolidation In September 2019, we adopted a 52/53 week fiscal year consisting of four 13-week quarters ending on the first Sunday after January 30, which for fiscal 2020 was February 2, 2020 and for fiscal 2021 is January 31, 2021. The second quarter of fiscal 2020 and 2021 ended on July 31, 2019 and August 2, 2020. Unless otherwise stated, all dates refer to the Company’s fiscal year and fiscal periods. The condensed consolidated financial statements include the accounts of the Company and our wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Unaudited Interim Consolidated Financial Information The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (U.S. GAAP) and applicable rules and regulations of the Securities and Exchange Commission (the SEC) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for fiscal 2020. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year 2021 or any future period. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the financial statements and accompanying notes. Actual results could differ from these estimates and assumptions due to risks and uncertainties, including uncertainty in the current economic environment from the ongoing COVID-19 pandemic. Such estimates include, but are not limited to, the determination of standalone selling price for revenue arrangements with multiple performance obligations, useful lives of intangible assets and property and equipment, the period of benefit for deferred contract costs for commissions, stock-based compensation, provision for income taxes including related reserves, and valuation of intangible assets and goodwill. Management bases its estimates on historical experience and on various other assumptions which management believes to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. In accordance with our on-going accounting practices, we review the estimated useful lives of our property and equipment on an ongoing basis. In the first quarter of fiscal 2021, management determined that the estimated useful lives of its test equipment and certain computer equipment and software required revision. The estimated useful lives of test equipment and certain computer equipment and software were revised to 4 years. Previously, the estimated useful lives of these assets ranged from 2 to 3 years. The change in estimated useful lives was accounted for as a change in estimate and recognized on a prospective basis effective February 3, 2020. The effect of this change in estimate resulted in a reduction to depreciation expense of $6.3 million and $14.1 million in the second quarter and first two quarters of fiscal 2021. Restricted Cash Restricted cash is comprised of cash collateral for letters of credit related to our leases and for a vendor credit card program. At the end of fiscal 2020 and the second quarter of fiscal 2021, we had restricted cash of $15.3 million. Marketable Securities We classify our marketable securities as available-for-sale at the time of purchase and reevaluate such classification at each balance sheet date. We may sell these securities at any time for use in current operations even if they have not yet reached maturity. As a result, we classify our securities, including those with maturities beyond twelve months, as current assets in the accompanying condensed consolidated balance sheets. We carry these securities at fair value and record unrealized gains and losses, in accumulated other comprehensive income (loss), which is reflected as a component of stockholders’ equity. We evaluate our securities with unrealized loss positions as to whether the declines in fair value were due to credit losses, and record the portion of impairment relating to the credit losses through allowance for credit losses limited to the amount that fair value was less than the amortized cost basis. Realized gains and losses from the sale of marketable securities are determined on the specific identification method. Realized gains and losses are reported in other income (expense), net in the condensed consolidated statements of operations. Business Combinations We allocate the purchase price to the assets acquired and liabilities assumed based on their estimated fair values. The excess of the purchase price over the fair values of the assets acquired and liabilities assumed is recorded as goodwill. During the measurement period, which may be up to one year from the acquisition date, we may record adjustments to the estimated fair value of the assets acquired and liabilities assumed, with the corresponding offset to goodwill. The results of operations of an acquired business is included in our condensed consolidated financial statements from the date of acquisition. Acquisition-related expenses are expensed as incurred. Operating Leases We determine if an arrangement contains a lease at inception. Lease liabilities are recognized at the present value of the future lease payments at commencement date. The interest rate implicit in our operating leases is not readily determinable, and therefore an incremental borrowing rate is estimated to determine the present value of future payments. The estimated incremental borrowing rate factors in a hypothetical interest rate on a collateralized basis with similar terms, payments, and economic environments. The operating lease right-of-use (ROU) asset is determined based on the lease liability initially established and reduced for any prepaid lease payments and any lease incentives. We have elected to not allocate the contract consideration for operating lease contracts with lease and non-lease components, and account for the lease and non-lease components as a single lease component. Certain of the operating lease agreements contain rent concession, rent escalation, and option to renew provisions. Rent concession and rent escalation provisions are considered in determining the lease cost. Lease cost is recognized on a straight-line basis over the lease term commencing on the date we have the right to use the leased property. We generally use the base, non-cancelable, lease term when recognizing the lease assets and liabilities, unless it is reasonably certain that an extension or termination option will be exercised. In addition, certain of our operating lease agreements contain tenant improvement allowances from our landlords. These allowances are accounted for as lease incentives and reduce our ROU asset and lease cost over the lease term. For short-term leases with lease term no longer than twelve months, and do not include an option to purchase the underlying asset that we are reasonably certain to exercise, we recognize rent expense in our condensed consolidated statements of operations on a straight-line basis over the lease term and record variable lease payments as incurred. Revenue Recognition We generate revenue primarily from two sources: (1) product revenue which includes hardware and embedded software and (2) subscription services revenue which includes Evergreen Storage subscriptions, and our unified subscription that includes Pure as-a-Service and Cloud Block Store . Our product revenue is derived from the sale of integrated storage hardware and operating system software. We typically recognize product revenue upon transfer of control to our customers. Products are typically shipped directly by us to customers. Our subscription services revenue is derived from the services we perform in connection with the sale of subscription services and is recognized ratably over the contractual term, which generally ranges from one Evergreen Storage subscription service agreement, which typically commences upon transfer of control of the corresponding products to our customers. Costs for subscription services are expensed when incurred. In addition, our Evergreen Storage subscription provides our customers with a new controller based upon certain terms. The controller refresh represents a separate performance obligation that is included within the Evergreen Storage subscription service agreement and the allocated revenue is recognized upon shipment of the controller. Our subscription services also include the right to receive unspecified software updates and upgrades on a when-and-if-available basis, software bug fixes, replacement parts and other services related to the underlying infrastructure, as well as access to our cloud-based management and support platform. We also sell professional services such as installation and implementation consulting services, and the related revenue is recognized as services are performed. We recognize revenue upon the transfer of promised goods or services to customers in an amount that reflects the consideration we expect to be entitled in exchange for those goods or services. This is achieved through applying the following five-step approach: • Identification of the contract, or contracts, with a customer • Identification of the performance obligations in the contract • Determination of the transaction price • Allocation of the transaction price to the performance obligations in the contract • Recognition of revenue when, or as, we satisfy a performance obligation When applying this five-step approach, we apply judgment in determining the customer's ability and intention to pay, which is based on a variety of factors including the customer's historical payment experience and/or published credit and financial information pertaining to the customer. To the extent a customer contract includes multiple promised goods or services, we determine whether promised goods or services should be accounted for as a separate performance obligation. The transaction price is determined based on the consideration which we will be entitled to in exchange for transferring goods or services to the customer. We allocate the transaction price to each performance obligation for contracts that contain multiple performance obligations based on a relative standalone selling price which is determined based on the price at which the performance obligation is sold separately, or if not observable through past transactions, is estimated taking into account available information such as market conditions and internally approved pricing guidelines related to performance obligations. Recent Accounting Pronouncements Not Yet Adopted In August 2020, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2020-06, Accounting for Convertible Instruments and Contracts in an Entity's Own Equity, which simplifies the accounting for certain convertible instruments, amends guidance on derivative scope exceptions for contracts in an entity's own equity, and modifies the guidance on diluted earnings per share (EPS) calculations as a result of these changes. The standard will be effective for us beginning February 7, 2022 and can be applied on either a fully retrospective or modified retrospective basis. Early adoption is permitted for fiscal years beginning after December 15, 2020. We are currently evaluating the impact of this standard on our condensed consolidated financial statements.

Financial Instruments

Financial Instruments	6 Months Ended
	Aug. 02, 2020
Investments, Debt and Equity Securities [Abstract]
Financial Instruments	Financial Instruments Fair Value Measurements We measure our cash equivalents, marketable securities, and restricted cash at fair value on a recurring basis. We define fair value as the exchange price that would be received from sale of an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. We measure our financial assets and liabilities at fair value at each reporting period using a fair value hierarchy which requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value: • Level 1 - Observable inputs are unadjusted quoted prices in active markets for identical assets or liabilities; • Level 2 - Observable inputs are quoted prices for similar assets and liabilities in active markets or inputs other than quoted prices that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments; and • Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. These inputs are based on our own assumptions used to measure assets and liabilities at fair value and require significant management judgment or estimation. We classify our cash equivalents, marketable securities and restricted cash within Level 1 or Level 2 because they are valued using either quoted market prices or inputs other than quoted prices which are directly or indirectly observable in the market, including readily-available pricing sources for the identical underlying security which may not be actively traded. Our fixed income available-for-sale securities consist of high quality, investment grade securities from diverse issuers. The valuation techniques used to measure the fair value of our marketable securities were derived from non-binding market consensus prices that are corroborated by observable market data or quoted market prices for similar instruments. In addition to our cash equivalents, marketable securities and restricted cash, we measure the fair value of our convertible senior notes (the Notes) on a quarterly basis for disclosure purposes. We consider the fair value of the Notes at the end of the second quarter of fiscal 2021 to be a Level 2 measurement due to its limited trading activity. Refer to Note 6 for the carrying amount and estimated fair value of our Notes at the end of the second quarter of fiscal 2021. Cash Equivalents, Marketable Securities and Restricted Cash The following tables summarize our cash equivalents, marketable securities and restricted cash by significant investment categories at the end of fiscal 2020 and the second quarter of fiscal 2021 (in thousands): At the End of Fiscal 2020 Amortized Gross Unrealized Gross Unrealized Fair Cash Equivalents Marketable Securities Restricted Cash Level 1 Money market accounts $ — $ — $ — $ 26,355 $ 11,068 $ — $ 15,287 Level 2 U.S. government treasury notes 323,751 2,146 — 325,897 — 325,897 — U.S. government agencies 53,930 317 (3) 54,244 — 54,244 — Corporate debt securities 452,318 3,954 (1) 456,271 3,001 453,270 — Foreign government bonds 14,994 147 — 15,141 — 15,141 — Asset-backed securities 87,267 699 — 87,966 — 87,966 — Total $ 932,260 $ 7,263 $ (4) $ 965,874 $ 14,069 $ 936,518 $ 15,287 At the End of the Second Quarter of Fiscal 2021 Amortized Gross Unrealized Gross Unrealized Fair Cash Equivalents Marketable Restricted Cash Level 1 Money market accounts $ — $ — $ — $ 46,281 $ 30,994 $ — $ 15,287 Level 2 U.S. government treasury notes 365,487 4,926 — 370,413 — 370,413 — U.S. government agencies 46,120 598 (4) 46,714 — 46,714 — Corporate debt securities 405,307 6,550 (2) 411,855 — 411,855 — Foreign government bonds 18,770 430 — 19,200 — 19,200 — Asset-backed securities 87,835 1,497 — 89,332 — 89,332 — Total $ 923,519 $ 14,001 $ (6) $ 983,795 $ 30,994 $ 937,514 $ 15,287 The amortized cost and estimated fair value of our marketable securities are shown below by contractual maturity (in thousands): At the End of the Second Quarter of Fiscal 2021 Amortized Cost Fair Value Due within one year $ 354,472 $ 357,266 Due in one to five years 569,047 580,248 Total $ 923,519 $ 937,514 We review the individual securities that have unrealized losses on a regular basis to evaluate whether or not any security has experienced and expect to experience credit losses which resulted in the decline in fair value. Based on our evaluation of available evidence, we concluded that the gross unrealized losses on our investments at the end of fiscal 2020 and the second quarter of fiscal 2021 were temporary in nature. We do not intend to sell these investments and it is not more likely than not that we will be required to sell these investments before recovery of their amortized cost basis, which may be at maturity. The following table presents gross unrealized losses and fair values for those investments that were in a continuous unrealized loss position at the end of fiscal 2020 and the second quarter of fiscal 2021, aggregated by investment category (in thousands): At the End of Fiscal 2020 Less than 12 months Greater than 12 months Total Fair Unrealized Fair Unrealized Fair Unrealized U.S. government treasury notes $ — $ — $ 1,000 $ — $ 1,000 $ — U.S. government agencies 4,998 (3) — — 4,998 (3) Corporate debt securities 9,691 (1) — — 9,691 (1) Total $ 14,689 $ (4) $ 1,000 $ — $ 15,689 $ (4) At the End of the Second Quarter of Fiscal 2021 Less than 12 months Greater than 12 months Total Fair Unrealized Fair Unrealized Fair Unrealized U.S. government agencies $ 4,996 $ (4) $ — $ — $ 4,996 $ (4) Corporate debt securities 1,309 (2) — — 1,309 (2) Total $ 6,305 $ (6) $ — $ — $ 6,305 $ (6) Realized gains or losses on sale of marketable securities were not significant for all periods presented.

Balance Sheet Components

Balance Sheet Components	6 Months Ended
	Aug. 02, 2020
Balance Sheet Components Disclosure [Abstract]
Balance Sheet Components	Balance Sheet Components Inventory Inventory consists of the following (in thousands): At the End of Fiscal 2020 Second Quarter of Fiscal 2021 Raw materials $ 2,974 $ 3,647 Finished goods 35,544 32,716 Inventory $ 38,518 $ 36,363 Property and Equipment, Net Property and equipment, net consists of the following (in thousands): At the End of Fiscal 2020 Second Quarter of Fiscal 2021 Test equipment $ 205,555 $ 222,682 Computer equipment and software 141,387 160,159 Furniture and fixtures 8,324 8,831 Leasehold improvements 40,356 42,568 Total property and equipment 395,622 434,240 Less: accumulated depreciation and amortization (272,882) (289,114) Property and equipment, net $ 122,740 $ 145,126 Depreciation and amortization expense related to property and equipment was $19.9 million and $13.8 million for the second quarter of fiscal 2020 and 2021, and $39.7 million and $26.2 million for the first two quarters of fiscal 2020 and 2021. Intangible Assets, Net Intangible assets, net consist of the following (in thousands): At the End of Fiscal 2020 Second Quarter of Fiscal 2021 Gross Carrying Value Accumulated Amortization Net Carrying Amount Gross Carrying Value Accumulated Amortization Net Carrying Amount Technology patents $ 19,125 $ (8,933) $ 10,192 $ 19,125 $ (10,327) $ 8,798 Developed technology 56,100 (8,035) 48,065 56,100 (12,043) 44,057 Intangible assets, net $ 75,225 $ (16,968) $ 58,257 $ 75,225 $ (22,370) $ 52,855 Intangible assets amortization expense was $2.6 million and $2.7 million for the second quarter of fiscal 2020 and 2021, and $3.9 million and $5.4 million for the first two quarters of fiscal 2020 and 2021. At the end of the second quarter of fiscal 2021, the weighted-average remaining amortization period was 3.2 years for technology patents and 5.5 years for developed technology. Amortization of the technology patents is included in general and administrative expenses due to their defensive nature and amortization of developed technology is included in cost of product revenue in the condensed consolidated statements of operations. At the end of the second quarter of fiscal 2021, future expected amortization expense for intangible assets is as follows (in thousands): Fiscal Years Ending Estimated Future Remainder of 2021 $ 5,402 2022 9,846 2023 9,300 2024 9,300 2025 9,300 Thereafter 9,707 Total $ 52,855 Goodwill At the end of fiscal 2020 and the second quarter of fiscal 2021, goodwill was $37.6 million. There were no impairments to goodwill during the second quarter and first two quarters of fiscal 2020 and 2021. Accrued Expenses and Other Liabilities Accrued expenses and other liabilities consist of the following (in thousands): At the End of Fiscal 2020 Second Quarter of Fiscal 2021 Taxes payable $ 9,012 $ 6,437 Accrued marketing 7,679 12,865 Accrued travel and entertainment expenses 3,829 909 Acquisition consideration 6,149 2,628 Other accrued liabilities 20,554 23,979 Total accrued expenses and other liabilities $ 47,223 $ 46,818

Deferred Revenue from Commissio

Deferred Revenue from Commissions	6 Months Ended
	Aug. 02, 2020
Revenue from Contract with Customer [Abstract]
Deferred Revenue and Commissions	Deferred Revenue and Commissions Deferred Commissions Deferred commissions consist of incremental costs paid to our sales force to obtain customer contracts. Deferred commissions related to product revenue are recognized upon transfer of control to customers and deferred commissions related to subscription services revenue are amortized over an expected useful life of six years. We determine the expected useful life based on an estimated benefit period by evaluating our technology development life cycle, expected customer relationship period and other factors. We classify deferred commissions as current and non-current on our condensed consolidated balance sheets based on the timing of when we expect to recognize the expense. Amortization of deferred commissions is included in sales and marketing expense in the condensed consolidated statements of operations. Changes in total deferred commissions during the periods presented are as follows (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Beginning balance $ 113,257 $ 142,363 $ 114,973 $ 139,204 Additions 30,074 30,534 48,310 60,296 Recognition of deferred commissions (24,763) (28,210) (44,715) (54,813) Ending balance $ 118,568 $ 144,687 $ 118,568 $ 144,687 Of the $144.7 million total deferred commissions balance at the end of the second quarter of fiscal 2021, we expect to recognize approximately 27% as commission expense over the next 12 months and the remainder thereafter. There was no impairment related to capitalized commissions for the second quarter and first two quarters of fiscal 2020 and 2021. Deferred Revenue Deferred revenue primarily consists of amounts that have been invoiced but have not yet been recognized as revenue including performance obligations pertaining to subscription services. The current portion of deferred revenue represents the amounts that are expected to be recognized as revenue within one year of the condensed consolidated balance sheet dates. Changes in total deferred revenue during the periods presented are as follows (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Beginning balance $ 564,230 $ 706,060 $ 535,920 $ 697,288 Additions 140,548 155,435 258,441 287,169 Recognition of deferred revenue (97,515) (136,744) (187,098) (259,706) Ending balance $ 607,263 $ 724,751 $ 607,263 $ 724,751 Revenue recognized during the second quarter of fiscal 2020 and 2021 from deferred revenue at the beginning of each respective period was $88.2 million and $119.4 million. Revenue recognized during the first two quarters of fiscal 2020 and 2021 from deferred revenue at the beginning of each respective period was $150.2 million and $204.6 million. Remaining Performance Obligations Total contracted but not recognized revenue was $956.4 million at the end of the second quarter of fiscal 2021. Contracted but not recognized revenue consists of both deferred revenue and non-cancelable amounts that are expected to be invoiced and recognized as revenue in future periods. The value of orders that are contracted but have not been fulfilled and that can be canceled by customers, are excluded from remaining performance obligations. Of the $956.4 million contracted but not recognized revenue at the end of the second quarter of fiscal 2021, we expect to recognize approximately 42% over the next 12 months, and the remainder thereafter.

Convertible Senior Notes

Convertible Senior Notes	6 Months Ended
	Aug. 02, 2020
Debt Disclosure [Abstract]
Convertible Senior Notes	Convertible Senior Notes In April 2018, we issued $575.0 million in principal amount of 0.125% convertible senior notes due 2023, in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act and received proceeds of $562.1 million, after deducting the underwriters’ discounts and commissions. The Notes are governed by an indenture (the Indenture) between us, as the issuer, and U.S. Bank National Association, as trustee. The Notes are our senior unsecured obligations. The Indenture does not contain any financial covenants or restrictions on the payments of dividends, the incurrence of indebtedness, or the issuance or repurchase of securities by us or any of our subsidiaries. The Notes mature on April 15, 2023 unless repurchased or redeemed by us or converted in accordance with their terms prior to the maturity date. Interest is payable semi-annually in arrears on April 15 and October 15 of each year, beginning on October 15, 2018. The Notes are convertible for up to 21,884,155 shares of our common stock at an initial conversion rate of approximately 38.0594 shares of common stock per $1,000 principal amount, which is equal to an initial conversion price of approximately $26.27 per share of common stock, subject to adjustment. Holders of the Notes may surrender their Notes for conversion at their option at any time prior to the close of business on the business day immediately preceding October 15, 2022, only under the following circumstances: • during any fiscal quarter commencing after the fiscal quarter ended on July 31, 2018 (and only during such fiscal quarter), if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price for the Notes on each applicable trading day; • during the five business day period after any five consecutive trading day period (the measurement period), in which the trading price per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate for the Notes on each such trading day; • if we call any or all of the Notes for redemption, at any time prior to the close of business on the second scheduled trading day immediately preceding the redemption date; or • upon the occurrence of specified corporate events. On or after October 15, 2022 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their Notes at any time regardless of the foregoing circumstances. Upon conversion, holders will receive cash, shares of our common stock, or a combination of cash and shares of our common stock, at our election. We intend to settle the principal of the Notes in cash. The conversion price will be subject to adjustment in some events. Following certain corporate events that occur prior to the maturity date or following our issuance of a notice of redemption, we will increase the conversion rate for a holder who elects to convert its Notes in connection with such corporate event or during the related redemption period in certain circumstances. Additionally, upon the occurrence of a corporate event that constitutes a “fundamental change” per the Indenture, holders of the Notes may require us to repurchase for cash all or a portion of the Notes at a purchase price equal to 100% of the principal amount of the Notes plus accrued and unpaid contingent interest. We may not redeem the Notes prior to April 20, 2021. We may redeem for cash all or any portion of the Notes, at our option, on or after April 20, 2021 if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending not more than two trading days immediately preceding the date on which we provide notice of redemption at a redemption price equal to 100% of the principal amount of the Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. No sinking fund is provided for the Notes. Upon the issuance of the Notes, we recorded total debt issuance costs of $12.9 million, of which $9.8 million was allocated to the Notes and $3.1 million was allocated to additional paid-in capital. The Notes consisted of the following (in thousands): At the End of Fiscal 2020 Second Quarter of Fiscal 2021 Liability: Principal $ 575,000 $ 575,000 Less: debt discount, net of amortization (91,378) (78,206) Less: debt issuance costs, net of amortization (6,615) (5,662) Net carrying amount of the Notes $ 477,007 $ 491,132 Stockholders' equity recorded at issuance: Allocated value of the conversion feature $ 136,333 Less: debt issuance costs (3,068) Additional paid-in capital $ 133,265 The total estimated fair value of the Notes at the end of the second quarter of fiscal 2021 was $579.4 million. The fair value was determined based on the closing trading price per $100 of the Notes as of the last day of trading for the period. The fair value of the Notes is primarily affected by the trading price of our common stock and market interest rates. Based on the closing price of our common stock of $17.86 on the last day of the second quarter of fiscal 2021, the if-converted value of the Notes of $390.9 million was less than its principal amount. At the end of the second quarter of fiscal 2021, the remaining term of the Notes is 32 months. The following table sets forth total interest expense recognized related to the Notes for the second quarter and first two quarters of fiscal 2020 and 2021 (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Amortization of debt discount $ 6,341 $ 6,703 $ 12,393 $ 13,171 Amortization of debt issuance costs 459 486 897 954 Total amortization of debt discount and debt issuance costs 6,800 7,189 13,290 14,125 Contractual interest expense 181 181 358 358 Total interest expense related to the Notes $ 6,981 $ 7,370 $ 13,648 $ 14,483 Effective interest rate of the liability component 5.6 % 5.6 % 5.6 % 5.6 % In connection with the offering of the Notes, we paid $64.6 million to enter into capped call transactions with certain of the underwriters and their affiliates (the Capped Calls), whereby we have the option to purchase a total of 21,884,155 shares of our common stock upon any conversion of Notes and/or offset any cash payments we are required to make in excess of the principal amount of the Notes, as the case may be, with such reduction or offset subject to a cap initially equal to $39.66 per share (which represents a premium of 100% over the last reported sales price of our common stock on April 4, 2018), subject to certain adjustments (the Cap Price). The cost of the Capped Calls was accounted for as a reduction to additional paid-in capital on the condensed consolidated balance sheet. The Capped Calls are intended to reduce or offset potential dilution of our common stock upon any conversion of the Notes, subject to a cap based on the Cap Price. Impact on Earnings Per Share The Notes will not impact our diluted earnings per share until the average market price of our common stock exceeds the conversion price of $26.27 per share, as we intend to settle the principal amount of the Notes in cash upon conversion. We are required under the treasury stock method to compute the potentially dilutive shares of common stock related to the Notes for periods we report net income. However, upon conversion, there will be no economic dilution from the Notes until the average market price of our common stock exceeds the Cap Price of $39.66 per share, as exercise of the Capped Calls offsets any dilution from the Notes from the conversion price up to the Cap Price. Capped Calls are excluded from the calculation of diluted earnings per share, as they would be anti-dilutive under the treasury stock method.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Aug. 02, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Letters of Credit At the end of fiscal 2020 and the second quarter of fiscal 2021, we had outstanding letters of credit in the aggregate amount of $11.5 million in connection with our facility leases. The letters of credit are collateralized by restricted cash and mature on various dates through August 2029. Legal Matters From time to time, we have become involved in claims and other legal matters arising in the normal course of business. We investigate these claims as they arise. Although claims are inherently unpredictable, we currently are not aware of any matters that we expect to have a material adverse effect on our business, financial position, results of operations or cash flows. Accordingly, we have not recorded any loss contingency on our condensed consolidated balance sheet at the end of the second quarter of fiscal 2021. Indemnification Our arrangements generally include certain provisions for indemnifying customers against liabilities if our products or services infringe a third party’s intellectual property rights. Other guarantees or indemnification arrangements include guarantees of product and service performance and standby letters of credit for lease facilities. It is not possible to determine the maximum potential amount under these indemnification obligations due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. To date, we have not incurred any material costs as a result of such obligations and have not accrued any liabilities related to such obligations in the condensed consolidated financial statements. In addition, we indemnify our officers, directors and certain key employees while they are serving in good faith in their respective capacities. To date, there have been no claims under any indemnification provisions.

Leases

Leases	6 Months Ended
	Aug. 02, 2020
Leases [Abstract]
Leases	Leases We lease office facilities under non-cancelable operating lease agreements expiring through July 2032. Our lease agreements do not contain any material residual value guarantees or restrictive covenants. During the second quarter of fiscal 2021, we commenced a data center lease executed in fiscal 2020 with total undiscounted cash flows of $22.4 million. The components of lease costs during the periods presented were as follows (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Fixed operating lease cost $ 8,228 $ 9,532 $ 16,711 $ 18,281 Variable lease cost (1) 2,242 2,291 4,342 4,942 Short-term lease cost (12 months or less) 1,484 1,559 2,345 3,066 Total lease cost $ 11,954 $ 13,382 $ 23,398 $ 26,289 ____________________________________ (1) Variable lease cost for the second quarter and first two quarters of fiscal 2020 and 2021 predominantly included common area maintenance charges. At the end of the second quarter of fiscal 2021, the weighted-average remaining lease term is 5.5 years and the weighted-average discount rate is 6.08%. Future lease payments under our non-cancelable operating leases at the end of the second quarter of fiscal 2021 were as follows (in thousands): Fiscal Years Ending Operating Leases The remainder of 2021 $ 18,983 2022 34,869 2023 30,180 2024 24,776 2025 21,582 Thereafter 36,094 Total future lease payments 166,484 Less: imputed interest (27,361) Present value of lease liabilities $ 139,123

Restructuring and Other

Restructuring and Other	6 Months Ended
	Aug. 02, 2020
Restructuring and Related Activities [Abstract]
Restructuring and Other	Restructuring and Other During the second quarter and first two quarters of fiscal 2021, we ceased use of certain leased facilities. The unamortized costs of $7.5 million relating to operating lease right-of-use assets and leasehold improvements for these leases were expensed. During the second quarter and first two quarters of fiscal 2021, we effected workforce realignment plans to streamline our operations and recognized $0.8 million and $6.6 million of restructuring costs related to one-time involuntary termination benefit costs. The restructuring charges are included in restructuring and other expenses in our condensed consolidated statement of operations. The liability for unpaid amounts at the end of the second quarter was not material.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Aug. 02, 2020
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity Preferred Stock We have 20,000,000 authorized shares of undesignated preferred stock, the rights, preferences and privileges of which may be designated from time to time by our board of directors. At the end of the second quarter of fiscal 2021, there were no shares of preferred stock issued or outstanding. Class A and Class B Common Stock We have two classes of authorized common stock, Class A common stock, which we refer to as our "common stock", and Class B common stock. At the end of the second quarter of fiscal 2021, we had 2,000,000,000 authorized shares of Class A common stock and 250,000,000 authorized shares of Class B common stock, with each class having a par value of $0.0001 per share. At the end of the second quarter of fiscal 2021, 267,776,462 shares of Class A common stock were issued and outstanding. Share Repurchase Program In August 2019, our board of directors approved the repurchase of up to $150.0 million of our common stock. During the second quarter of fiscal 2021, we repurchased and retired 1,176,761 shares of common stock at an average purchase price of $17.00 per share for an aggregate repurchase price of $20.0 million. During the first two quarters of fiscal 2021, we repurchased and retired 7,136,191 shares of common stock at an average purchase price of $12.61 per share for an aggregate repurchase price of approximately $90.0 million. At the end of the second quarter of fiscal 2021, $45.0 million remained available for future share repurchases under our current repurchase authorization.

Equity Incentive Plans

Equity Incentive Plans	6 Months Ended
	Aug. 02, 2020
Share-based Payment Arrangement [Abstract]
Equity Incentive Plans	Equity Incentive Plans Equity Incentive Plans We maintain two equity incentive plans: the 2009 Equity Incentive Plan (the 2009 Plan) and the 2015 Equity Incentive Plan (the 2015 Plan). The 2015 Plan serves as the successor to our 2009 Plan and provides for grants of incentive stock options to our employees and non-statutory stock options, stock appreciation rights, restricted stock, restricted stock unit awards (RSUs), performance stock awards, performance cash awards, and other forms of stock awards to our employees, directors and consultants. Our equity awards generally vest over a two four We net-share settle equity awards held by certain employees by withholding shares upon vesting to satisfy tax withholding obligations. The shares withheld to satisfy employee tax withholding obligations are returned to our 2015 Plan and will be available for future issuance. Payments for employees’ tax obligations to the tax authorities are recognized as a reduction to additional paid-in capital and reflected as a financing activity in our condensed consolidated statements of cash flows. 2015 Amended and Restated Employee Stock Purchase Plan Under our Amended and Restated 2015 Employee Stock Purchase Plan (2015 ESPP), our board of directors (or a committee thereof) has the authority to establish the length and terms of the offering periods and purchase periods and the purchase price of the shares of common stock which may be purchased under the plan. The current offering terms allow eligible employees to purchase shares of our common stock at a discount through payroll deductions of up to 30% of their eligible compensation, subject to a cap of 3,000 shares on any purchase date, a dollar cap of $7,500 per purchase period, or $25,000 in any calendar year (as determined under applicable tax rules). The current terms also allow for a 24-month offering period beginning March 16th and September 16th of each year, with each offering period consisting of four 6 month purchase periods, subject to a reset provision. Further, currently, on each purchase date, eligible employees may purchase our common stock at a price per share equal to 85% of the lesser of the fair market value of our common stock (1) on the first trading day of the applicable offering period or (2) the purchase date. Under the reset provision currently authorized, if the closing stock price on the offering date of a new offering falls below the closing stock price on the offering date of an ongoing offering, the ongoing offering would terminate immediately following the purchase of ESPP shares on the purchase date immediately preceding the new offering and participants in the terminated ongoing offering would automatically be enrolled in the new offering (ESPP reset), resulting in a modification charge to be recognized over the new offering period. During the first quarter of fiscal 2021, there was an ESPP reset that resulted in a modification charge of $23.8 million, which is being recognized over the new offering period ending March 15, 2022. Stock-based compensation expense related to our 2015 ESPP was $4.2 million and $6.4 million during the second quarter of fiscal 2020 and 2021, and $15.7 million and $12.0 million during the first two quarters of fiscal 2020 and 2021. At the end of the second quarter of fiscal 2021, total unrecognized stock-based compensation cost related to our 2015 ESPP was $41.2 million, which is expected to be recognized over a weighted-average period of 1.6 years. Stock Options A summary of the stock option activity under our equity incentive plans and related information is as follows: Options Outstanding Number of Weighted- Weighted- Aggregate Balance at the end of fiscal 2020 26,822,243 $ 8.97 3.9 $ 237,803 Options exercised (4,312,894) 5.01 Options forfeited (125,685) 16.54 Balance at the end of the second quarter of fiscal 2021 22,383,664 $ 9.70 4.2 $ 183,708 Vested and exercisable at the end of the second quarter of fiscal 2021 20,369,881 $ 9.06 4.1 $ 179,477 The aggregate intrinsic value of options vested and exercisable at the end of the second quarter of fiscal 2021 is calculated based on the difference between the exercise price and the closing price of $17.86 of our common stock on the last day of the second quarter of fiscal 2021. Stock-based compensation expense recognized related to stock options was $4.5 million and $2.1 million during the second quarter of fiscal 2020 and 2021, and $10.0 million and $4.1 million during the first two quarters of fiscal 2020 and 2021. At the end of the second quarter of fiscal 2021, total unrecognized employee compensation cost related to outstanding options was $6.4 million, which is expected to be recognized over a weighted-average period of 1.0 year. RSUs and PRSUs A summary of the RSU and PRSU activity under our 2015 Plan and related information is as follows: Number of Weighted- Aggregate Unvested balance at the end of fiscal 2020 25,434,597 $ 18.72 $ 452,736 Granted 14,461,995 11.27 Vested (5,454,940) 16.93 Forfeited (1,643,740) 17.34 Unvested balance at the end of the second quarter of fiscal 2021 32,797,912 $ 15.80 $ 585,770 During the second quarter of fiscal 2021, we issued 1,451,896 shares of performance RSUs (PRSUs), at a target percentage of 100%, with both performance and service vesting conditions payable in common stock, from 0% to 125% of the target number granted, contingent upon the degree to which the performance condition is met. Any portion of shares that are not earned will be canceled. Stock-based compensation expense recognized related to RSUs and PRSUs was $40.4 million and $50.1 million during the second quarter of fiscal 2020 and 2021, and $77.7 million and $96.9 million during the first two quarters of fiscal 2020 and 2021. At the end of the second quarter of fiscal 2021, total unrecognized employee compensation cost related to unvested RSUs was $472.5 million, which is expected to be recognized over a weighted-average period of 2.9 years. Restricted Stock A summary of the restricted stock activity under our 2015 Plan and related information is as follows: Number of Weighted- Aggregate Unvested balance at the end of fiscal 2020 2,127,206 $ 19.58 $ 37,684 Vested (787,698) 19.54 Forfeited/canceled (229,605) 20.15 Unvested balance at the end of the second quarter of fiscal 2021 1,109,903 $ 19.49 $ 19,823 All unvested shares of restricted stock are subject to cancellation to the extent vesting conditions are not met. Stock-based compensation expense recognized related to restricted stock was $7.4 million and $2.8 million during the second quarter of fiscal 2020 and 2021, and $14.8 million and $7.1 million during the first two quarters of fiscal 2020 and 2021. At the end of the second quarter of fiscal 2021, total unrecognized employee compensation cost related to unvested restricted stock was $7.1 million, which is expected to be recognized over a weighted-average period of 1.4 years. Stock-Based Compensation Expense The following table summarizes the components of stock-based compensation expense recognized in the condensed consolidated statements of operations (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Cost of revenue—product $ 954 $ 990 $ 1,931 $ 1,986 Cost of revenue—subscription services 3,633 3,686 7,584 7,078 Research and development 29,108 29,839 57,353 58,550 Sales and marketing 16,055 16,848 34,369 33,120 General and administrative 8,654 10,089 19,324 19,412 Total stock-based compensation expense $ 58,404 $ 61,452 $ 120,561 $ 120,146 The tax benefit related to stock-based compensation expense for all periods presented was not material.

Net Loss per Share Attributable

Net Loss per Share Attributable to Common Stockholders	6 Months Ended
	Aug. 02, 2020
Earnings Per Share [Abstract]
Net Loss per Share Attributable to Common Stockholders	Net Loss per Share Attributable to Common Stockholders Basic and diluted net loss per share attributable to common stockholders is presented in conformity with the two-class method required for participating securities. Basic net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase. Diluted net loss per share attributable to common stockholders is computed by giving effect to all potentially dilutive common stock equivalents, including our outstanding stock options, common stock related to unvested RSUs and PRSUs, repurchasable shares from restricted stock, our Notes to the extent dilutive, and common stock issuable pursuant to the ESPP. These potentially dilutive common stock equivalents have been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect is anti-dilutive. The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except per share data): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Net loss $ (66,018) $ (64,967) $ (166,354) $ (155,561) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 251,298 264,799 248,336 263,867 Net loss per share attributable to common stockholders, basic and diluted $ (0.26) $ (0.25) $ (0.67) $ (0.59) The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Stock options to purchase common stock 31,739 23,329 32,852 24,482 Unvested RSUs and PRSUs 25,513 33,286 24,743 31,216 Restricted stock subject to repurchase 2,917 1,236 2,777 1,473 Shares related to convertible senior notes 21,884 21,884 21,884 21,884 Shares issuable pursuant to the ESPP 720 2,040 720 2,040 Total 82,773 81,775 82,976 81,095

Other Income (Expense), Net

Other Income (Expense), Net	6 Months Ended
	Aug. 02, 2020
Other Income and Expenses [Abstract]
Other Income (Expense), Net	Other Income (Expense), Net Other income (expense), net consists of the following (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Interest income (1) $ 6,772 $ 4,424 $ 13,606 $ 10,655 Interest expense (2) (6,981) (7,433) (13,648) (14,584) Foreign currency transactions gains (losses) (443) 2,808 (2,426) 422 Other income — 1,804 — 1,694 Total other income (expense), net $ (652) $ 1,603 $ (2,468) $ (1,813) ____________________________________ (1) Interest income includes interest income related to our cash, cash equivalents and marketable securities and non-cash interest income (expense) related to accretion (amortization) of the discount (premium) on marketable securities. (2) Interest expense includes non-cash interest expense related to amortization of the debt discount and debt issuance costs of the Notes and the contractual interest expense related to the Notes and debt.

Income Taxes

Income Taxes	6 Months Ended
	Aug. 02, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our provision for income tax primarily reflects taxes on international operations and state income taxes. The difference between the income tax provision that would be derived by applying the statutory rate to our loss before income taxes and the income tax provision recorded was primarily attributable to changes in our valuation allowance, stock-based compensation expense and research and development credits. On June 7, 2019, a three-judge panel from the U.S. Court of Appeals for the Ninth Circuit overturned the U.S. Tax Court's decision in Altera Corp. v. Commissioner and upheld the portion of the Treasury regulations under Section 482 of the Internal Revenue Code that requires related parties in a cost-sharing arrangement to share expenses related to share-based compensation. On July 22, 2019, the taxpayer filed a petition for a rehearing before the full Ninth Circuit and the request was denied on November 12, 2019. On February 10, 2020, the taxpayer filed a petition to appeal the decision to the Supreme Court and on June 22, 2020 the Supreme Court denied the petition. The Supreme Court action did not have a material impact on our financial statements. There is no impact on our effective tax rate for the second quarter and first two quarters of fiscal 2021, due to our U.S. full valuation allowance against our deferred tax assets. At the end of the second quarter of fiscal 2021, there were no material changes to either the nature or the amounts of the uncertain tax positions previously determined for fiscal 2020.

Segment Information

Segment Information	6 Months Ended
	Aug. 02, 2020
Segment Reporting [Abstract]
Segment Information	Segment Information Our chief operating decision maker is our Chief Executive Officer . Our chief operating decision maker reviews financial information presented on a consolidated basis fo r purposes of allocating resources and evaluating financial performance. We have one business activity and there are no segment managers who are held accountable for operations or operating results. Accordingly, we have a single reportable segment. Disaggregation of Revenue The following table depicts the disaggregation of revenue by geographic area based on the billing address of our customers and is consistent with how we evaluate our financial performance (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 United States $ 294,596 $ 281,679 $ 523,535 $ 545,825 Rest of the world 101,731 122,044 199,492 225,017 Total revenue $ 396,327 $ 403,723 $ 723,027 $ 770,842 Long-Lived Assets by Geographic Area Long-lived assets, which are comprised of property and equipment, net, by geographic area are summarized as follows (in thousands): At the End of Fiscal 2020 Second Quarter of Fiscal 2021 United States $ 113,942 $ 135,311 Rest of the world 8,798 9,815 Total long-lived assets $ 122,740 $ 145,126

Subsequent Event

Subsequent Event	6 Months Ended
	Aug. 02, 2020
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On August 24, 2020, we entered into a Credit Agreement with a consortium of financial institutions and lenders that provides for a five-year, senior secured revolving credit facility of $300 million (Credit Facility). Proceeds from the Credit Facility may be used for general corporate purposes and working capital. The annual interest rates applicable to loans under the Credit Facility are, at our option, equal to either a base rate plus a margin ranging from 0.50% to 1.25% or LIBOR, subject to a floor of 0%, plus a margin ranging from 1.50% to 2.25%. In addition, we will incur a commitment fee on the unused portion of the commitments ranging from 0.25% to 0.40% per annum. The respective margins are based on the then-applicable Consolidated Leverage Ratio. Loans under the Credit Facility are subject to certain restrictions and two financial ratios measured as of the last day of each fiscal quarter, commencing with the fiscal quarter ending January 31, 2021: a Consolidated Leverage Ratio not to exceed 4.5:1 and an Interest Coverage Ratio not to be less than 3:1. We have not borrowed any funds under the Credit Facility.

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies - (Policies)	6 Months Ended
	Aug. 02, 2020
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation In September 2019, we adopted a 52/53 week fiscal year consisting of four 13-week quarters ending on the first Sunday after January 30, which for fiscal 2020 was February 2, 2020 and for fiscal 2021 is January 31, 2021. The second quarter of fiscal 2020 and 2021 ended on July 31, 2019 and August 2, 2020. Unless otherwise stated, all dates refer to the Company’s fiscal year and fiscal periods. The condensed consolidated financial statements include the accounts of the Company and our wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Unaudited Interim Consolidated Financial Information	Unaudited Interim Consolidated Financial Information The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (U.S. GAAP) and applicable rules and regulations of the Securities and Exchange Commission (the SEC) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for fiscal 2020. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year 2021 or any future period.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the financial statements and accompanying notes. Actual results could differ from these estimates and assumptions due to risks and uncertainties, including uncertainty in the current economic environment from the ongoing COVID-19 pandemic. Such estimates include, but are not limited to, the determination of standalone selling price for revenue arrangements with multiple performance obligations, useful lives of intangible assets and property and equipment, the period of benefit for deferred contract costs for commissions, stock-based compensation, provision for income taxes including related reserves, and valuation of intangible assets and goodwill. Management bases its estimates on historical experience and on various other assumptions which management believes to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities.
Restricted Cash	Restricted Cash Restricted cash is comprised of cash collateral for letters of credit related to our leases and for a vendor credit card program.
Marketable Securities	Marketable Securities We classify our marketable securities as available-for-sale at the time of purchase and reevaluate such classification at each balance sheet date. We may sell these securities at any time for use in current operations even if they have not yet reached maturity. As a result, we classify our securities, including those with maturities beyond twelve months, as current assets in the accompanying condensed consolidated balance sheets. We carry these securities at fair value and record unrealized gains and losses, in accumulated other comprehensive income (loss), which is reflected as a component of stockholders’ equity. We evaluate our securities with unrealized loss positions as to whether the declines in fair value were due to credit losses, and record the portion of impairment relating to the credit losses through allowance for credit losses limited to the amount that fair value was less than the amortized cost basis. Realized gains and losses from the sale of marketable securities are determined on the specific identification method. Realized gains and losses are reported in other income (expense), net in the condensed consolidated statements of operations.
Business Combinations	Business CombinationsWe allocate the purchase price to the assets acquired and liabilities assumed based on their estimated fair values. The excess of the purchase price over the fair values of the assets acquired and liabilities assumed is recorded as goodwill. During the measurement period, which may be up to one year from the acquisition date, we may record adjustments to the estimated fair value of the assets acquired and liabilities assumed, with the corresponding offset to goodwill. The results of operations of an acquired business is included in our condensed consolidated financial statements from the date of acquisition. Acquisition-related expenses are expensed as incurred.
Operating Leases	Operating Leases We determine if an arrangement contains a lease at inception. Lease liabilities are recognized at the present value of the future lease payments at commencement date. The interest rate implicit in our operating leases is not readily determinable, and therefore an incremental borrowing rate is estimated to determine the present value of future payments. The estimated incremental borrowing rate factors in a hypothetical interest rate on a collateralized basis with similar terms, payments, and economic environments. The operating lease right-of-use (ROU) asset is determined based on the lease liability initially established and reduced for any prepaid lease payments and any lease incentives. We have elected to not allocate the contract consideration for operating lease contracts with lease and non-lease components, and account for the lease and non-lease components as a single lease component. Certain of the operating lease agreements contain rent concession, rent escalation, and option to renew provisions. Rent concession and rent escalation provisions are considered in determining the lease cost. Lease cost is recognized on a straight-line basis over the lease term commencing on the date we have the right to use the leased property. We generally use the base, non-cancelable, lease term when recognizing the lease assets and liabilities, unless it is reasonably certain that an extension or termination option will be exercised. In addition, certain of our operating lease agreements contain tenant improvement allowances from our landlords. These allowances are accounted for as lease incentives and reduce our ROU asset and lease cost over the lease term. For short-term leases with lease term no longer than twelve months, and do not include an option to purchase the underlying asset that we are reasonably certain to exercise, we recognize rent expense in our condensed consolidated statements of operations on a straight-line basis over the lease term and record variable lease payments as incurred.
Revenue Recognition	Revenue Recognition We generate revenue primarily from two sources: (1) product revenue which includes hardware and embedded software and (2) subscription services revenue which includes Evergreen Storage subscriptions, and our unified subscription that includes Pure as-a-Service and Cloud Block Store . Our product revenue is derived from the sale of integrated storage hardware and operating system software. We typically recognize product revenue upon transfer of control to our customers. Products are typically shipped directly by us to customers. Our subscription services revenue is derived from the services we perform in connection with the sale of subscription services and is recognized ratably over the contractual term, which generally ranges from one Evergreen Storage subscription service agreement, which typically commences upon transfer of control of the corresponding products to our customers. Costs for subscription services are expensed when incurred. In addition, our Evergreen Storage subscription provides our customers with a new controller based upon certain terms. The controller refresh represents a separate performance obligation that is included within the Evergreen Storage subscription service agreement and the allocated revenue is recognized upon shipment of the controller. Our subscription services also include the right to receive unspecified software updates and upgrades on a when-and-if-available basis, software bug fixes, replacement parts and other services related to the underlying infrastructure, as well as access to our cloud-based management and support platform. We also sell professional services such as installation and implementation consulting services, and the related revenue is recognized as services are performed. We recognize revenue upon the transfer of promised goods or services to customers in an amount that reflects the consideration we expect to be entitled in exchange for those goods or services. This is achieved through applying the following five-step approach: • Identification of the contract, or contracts, with a customer • Identification of the performance obligations in the contract • Determination of the transaction price • Allocation of the transaction price to the performance obligations in the contract • Recognition of revenue when, or as, we satisfy a performance obligation When applying this five-step approach, we apply judgment in determining the customer's ability and intention to pay, which is based on a variety of factors including the customer's historical payment experience and/or published credit and financial information pertaining to the customer. To the extent a customer contract includes multiple promised goods or services, we determine whether promised goods or services should be accounted for as a separate performance obligation. The transaction price is determined based on the consideration which we will be entitled to in exchange for transferring goods or services to the customer. We allocate the transaction price to each performance obligation for contracts that contain multiple performance obligations based on a relative standalone selling price which is determined based on the price at which the performance obligation is sold separately, or if not observable through past transactions, is estimated taking into account available information such as market conditions and internally approved pricing guidelines related to performance obligations.
Recent accounting pronouncements not yet adopted	Recent Accounting Pronouncements Not Yet Adopted In August 2020, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2020-06, Accounting for Convertible Instruments and Contracts in an Entity's Own Equity, which simplifies the accounting for certain convertible instruments, amends guidance on derivative scope exceptions for contracts in an entity's own equity, and modifies the guidance on diluted earnings per share (EPS) calculations as a result of these changes. The standard will be effective for us beginning February 7, 2022 and can be applied on either a fully retrospective or modified retrospective basis. Early adoption is permitted for fiscal years beginning after December 15, 2020. We are currently evaluating the impact of this standard on our condensed consolidated financial statements.
Fair Value Measurements	Fair Value Measurements We measure our cash equivalents, marketable securities, and restricted cash at fair value on a recurring basis. We define fair value as the exchange price that would be received from sale of an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. We measure our financial assets and liabilities at fair value at each reporting period using a fair value hierarchy which requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value: • Level 1 - Observable inputs are unadjusted quoted prices in active markets for identical assets or liabilities; • Level 2 - Observable inputs are quoted prices for similar assets and liabilities in active markets or inputs other than quoted prices that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments; and • Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. These inputs are based on our own assumptions used to measure assets and liabilities at fair value and require significant management judgment or estimation.

Financial Instruments - (Tables

Financial Instruments - (Tables)	6 Months Ended
	Aug. 02, 2020
Investments, Debt and Equity Securities [Abstract]
Cash Equivalents, Marketable Securities and Restricted Cash	The following tables summarize our cash equivalents, marketable securities and restricted cash by significant investment categories at the end of fiscal 2020 and the second quarter of fiscal 2021 (in thousands): At the End of Fiscal 2020 Amortized Gross Unrealized Gross Unrealized Fair Cash Equivalents Marketable Securities Restricted Cash Level 1 Money market accounts $ — $ — $ — $ 26,355 $ 11,068 $ — $ 15,287 Level 2 U.S. government treasury notes 323,751 2,146 — 325,897 — 325,897 — U.S. government agencies 53,930 317 (3) 54,244 — 54,244 — Corporate debt securities 452,318 3,954 (1) 456,271 3,001 453,270 — Foreign government bonds 14,994 147 — 15,141 — 15,141 — Asset-backed securities 87,267 699 — 87,966 — 87,966 — Total $ 932,260 $ 7,263 $ (4) $ 965,874 $ 14,069 $ 936,518 $ 15,287 At the End of the Second Quarter of Fiscal 2021 Amortized Gross Unrealized Gross Unrealized Fair Cash Equivalents Marketable Restricted Cash Level 1 Money market accounts $ — $ — $ — $ 46,281 $ 30,994 $ — $ 15,287 Level 2 U.S. government treasury notes 365,487 4,926 — 370,413 — 370,413 — U.S. government agencies 46,120 598 (4) 46,714 — 46,714 — Corporate debt securities 405,307 6,550 (2) 411,855 — 411,855 — Foreign government bonds 18,770 430 — 19,200 — 19,200 — Asset-backed securities 87,835 1,497 — 89,332 — 89,332 — Total $ 923,519 $ 14,001 $ (6) $ 983,795 $ 30,994 $ 937,514 $ 15,287
Amortized Cost and Estimated Fair Value	The amortized cost and estimated fair value of our marketable securities are shown below by contractual maturity (in thousands): At the End of the Second Quarter of Fiscal 2021 Amortized Cost Fair Value Due within one year $ 354,472 $ 357,266 Due in one to five years 569,047 580,248 Total $ 923,519 $ 937,514
Gross Unrealized Losses and Fair Values	The following table presents gross unrealized losses and fair values for those investments that were in a continuous unrealized loss position at the end of fiscal 2020 and the second quarter of fiscal 2021, aggregated by investment category (in thousands): At the End of Fiscal 2020 Less than 12 months Greater than 12 months Total Fair Unrealized Fair Unrealized Fair Unrealized U.S. government treasury notes $ — $ — $ 1,000 $ — $ 1,000 $ — U.S. government agencies 4,998 (3) — — 4,998 (3) Corporate debt securities 9,691 (1) — — 9,691 (1) Total $ 14,689 $ (4) $ 1,000 $ — $ 15,689 $ (4) At the End of the Second Quarter of Fiscal 2021 Less than 12 months Greater than 12 months Total Fair Unrealized Fair Unrealized Fair Unrealized U.S. government agencies $ 4,996 $ (4) $ — $ — $ 4,996 $ (4) Corporate debt securities 1,309 (2) — — 1,309 (2) Total $ 6,305 $ (6) $ — $ — $ 6,305 $ (6)

Balance Sheet Components - (Tab

Balance Sheet Components - (Tables)	6 Months Ended
	Aug. 02, 2020
Balance Sheet Components Disclosure [Abstract]
Inventory	Inventory consists of the following (in thousands): At the End of Fiscal 2020 Second Quarter of Fiscal 2021 Raw materials $ 2,974 $ 3,647 Finished goods 35,544 32,716 Inventory $ 38,518 $ 36,363
Property and Equipment, Net	Property and equipment, net consists of the following (in thousands): At the End of Fiscal 2020 Second Quarter of Fiscal 2021 Test equipment $ 205,555 $ 222,682 Computer equipment and software 141,387 160,159 Furniture and fixtures 8,324 8,831 Leasehold improvements 40,356 42,568 Total property and equipment 395,622 434,240 Less: accumulated depreciation and amortization (272,882) (289,114) Property and equipment, net $ 122,740 $ 145,126
Intangible Assets, Net	Intangible assets, net consist of the following (in thousands): At the End of Fiscal 2020 Second Quarter of Fiscal 2021 Gross Carrying Value Accumulated Amortization Net Carrying Amount Gross Carrying Value Accumulated Amortization Net Carrying Amount Technology patents $ 19,125 $ (8,933) $ 10,192 $ 19,125 $ (10,327) $ 8,798 Developed technology 56,100 (8,035) 48,065 56,100 (12,043) 44,057 Intangible assets, net $ 75,225 $ (16,968) $ 58,257 $ 75,225 $ (22,370) $ 52,855
Expected Amortization Expenses for Intangible Assets	At the end of the second quarter of fiscal 2021, future expected amortization expense for intangible assets is as follows (in thousands): Fiscal Years Ending Estimated Future Remainder of 2021 $ 5,402 2022 9,846 2023 9,300 2024 9,300 2025 9,300 Thereafter 9,707 Total $ 52,855
Accrued Expenses and Other Liabilities	Accrued expenses and other liabilities consist of the following (in thousands): At the End of Fiscal 2020 Second Quarter of Fiscal 2021 Taxes payable $ 9,012 $ 6,437 Accrued marketing 7,679 12,865 Accrued travel and entertainment expenses 3,829 909 Acquisition consideration 6,149 2,628 Other accrued liabilities 20,554 23,979 Total accrued expenses and other liabilities $ 47,223 $ 46,818

Deferred Revenue and Commission

Deferred Revenue and Commissions (Tables)	6 Months Ended
	Aug. 02, 2020
Revenue from Contract with Customer [Abstract]
Deferred Commissions	Changes in total deferred commissions during the periods presented are as follows (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Beginning balance $ 113,257 $ 142,363 $ 114,973 $ 139,204 Additions 30,074 30,534 48,310 60,296 Recognition of deferred commissions (24,763) (28,210) (44,715) (54,813) Ending balance $ 118,568 $ 144,687 $ 118,568 $ 144,687
Deferred Revenue	Changes in total deferred revenue during the periods presented are as follows (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Beginning balance $ 564,230 $ 706,060 $ 535,920 $ 697,288 Additions 140,548 155,435 258,441 287,169 Recognition of deferred revenue (97,515) (136,744) (187,098) (259,706) Ending balance $ 607,263 $ 724,751 $ 607,263 $ 724,751

Convertible Senior Notes - (Tab

Convertible Senior Notes - (Tables)	6 Months Ended
	Aug. 02, 2020
Debt Disclosure [Abstract]
Convertible Debt	The Notes consisted of the following (in thousands): At the End of Fiscal 2020 Second Quarter of Fiscal 2021 Liability: Principal $ 575,000 $ 575,000 Less: debt discount, net of amortization (91,378) (78,206) Less: debt issuance costs, net of amortization (6,615) (5,662) Net carrying amount of the Notes $ 477,007 $ 491,132 Stockholders' equity recorded at issuance: Allocated value of the conversion feature $ 136,333 Less: debt issuance costs (3,068) Additional paid-in capital $ 133,265
Interest Expense	The following table sets forth total interest expense recognized related to the Notes for the second quarter and first two quarters of fiscal 2020 and 2021 (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Amortization of debt discount $ 6,341 $ 6,703 $ 12,393 $ 13,171 Amortization of debt issuance costs 459 486 897 954 Total amortization of debt discount and debt issuance costs 6,800 7,189 13,290 14,125 Contractual interest expense 181 181 358 358 Total interest expense related to the Notes $ 6,981 $ 7,370 $ 13,648 $ 14,483 Effective interest rate of the liability component 5.6 % 5.6 % 5.6 % 5.6 %

Leases - (Tables)

Leases - (Tables)	6 Months Ended
	Aug. 02, 2020
Leases [Abstract]
Lease costs	The components of lease costs during the periods presented were as follows (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Fixed operating lease cost $ 8,228 $ 9,532 $ 16,711 $ 18,281 Variable lease cost (1) 2,242 2,291 4,342 4,942 Short-term lease cost (12 months or less) 1,484 1,559 2,345 3,066 Total lease cost $ 11,954 $ 13,382 $ 23,398 $ 26,289 ____________________________________ (1) Variable lease cost for the second quarter and first two quarters of fiscal 2020 and 2021 predominantly included common area maintenance charges.
Future minimum lease payments	Future lease payments under our non-cancelable operating leases at the end of the second quarter of fiscal 2021 were as follows (in thousands): Fiscal Years Ending Operating Leases The remainder of 2021 $ 18,983 2022 34,869 2023 30,180 2024 24,776 2025 21,582 Thereafter 36,094 Total future lease payments 166,484 Less: imputed interest (27,361) Present value of lease liabilities $ 139,123

Equity Incentive Plans - (Table

Equity Incentive Plans - (Tables)	6 Months Ended
	Aug. 02, 2020
Share-based Payment Arrangement [Abstract]
Equity Incentive Plans	A summary of the stock option activity under our equity incentive plans and related information is as follows: Options Outstanding Number of Weighted- Weighted- Aggregate Balance at the end of fiscal 2020 26,822,243 $ 8.97 3.9 $ 237,803 Options exercised (4,312,894) 5.01 Options forfeited (125,685) 16.54 Balance at the end of the second quarter of fiscal 2021 22,383,664 $ 9.70 4.2 $ 183,708 Vested and exercisable at the end of the second quarter of fiscal 2021 20,369,881 $ 9.06 4.1 $ 179,477
Restricted Stock Units and Performance Restricted Stock Units	A summary of the RSU and PRSU activity under our 2015 Plan and related information is as follows: Number of Weighted- Aggregate Unvested balance at the end of fiscal 2020 25,434,597 $ 18.72 $ 452,736 Granted 14,461,995 11.27 Vested (5,454,940) 16.93 Forfeited (1,643,740) 17.34 Unvested balance at the end of the second quarter of fiscal 2021 32,797,912 $ 15.80 $ 585,770
Restricted Stock	A summary of the restricted stock activity under our 2015 Plan and related information is as follows: Number of Weighted- Aggregate Unvested balance at the end of fiscal 2020 2,127,206 $ 19.58 $ 37,684 Vested (787,698) 19.54 Forfeited/canceled (229,605) 20.15 Unvested balance at the end of the second quarter of fiscal 2021 1,109,903 $ 19.49 $ 19,823
Stock-Based Compensation	The following table summarizes the components of stock-based compensation expense recognized in the condensed consolidated statements of operations (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Cost of revenue—product $ 954 $ 990 $ 1,931 $ 1,986 Cost of revenue—subscription services 3,633 3,686 7,584 7,078 Research and development 29,108 29,839 57,353 58,550 Sales and marketing 16,055 16,848 34,369 33,120 General and administrative 8,654 10,089 19,324 19,412 Total stock-based compensation expense $ 58,404 $ 61,452 $ 120,561 $ 120,146

Net Loss per Share Attributab_2

Net Loss per Share Attributable to Common Stockholders - (Tables)	6 Months Ended
	Aug. 02, 2020
Earnings Per Share [Abstract]
Net Loss per Share	The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except per share data): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Net loss $ (66,018) $ (64,967) $ (166,354) $ (155,561) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 251,298 264,799 248,336 263,867 Net loss per share attributable to common stockholders, basic and diluted $ (0.26) $ (0.25) $ (0.67) $ (0.59)
Shares Excluded	The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Stock options to purchase common stock 31,739 23,329 32,852 24,482 Unvested RSUs and PRSUs 25,513 33,286 24,743 31,216 Restricted stock subject to repurchase 2,917 1,236 2,777 1,473 Shares related to convertible senior notes 21,884 21,884 21,884 21,884 Shares issuable pursuant to the ESPP 720 2,040 720 2,040 Total 82,773 81,775 82,976 81,095

Other Income (Expense), Net - (

Other Income (Expense), Net - (Tables)	6 Months Ended
	Aug. 02, 2020
Other Income and Expenses [Abstract]
Summary of Other Income (Expense)	Other income (expense), net consists of the following (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 Interest income (1) $ 6,772 $ 4,424 $ 13,606 $ 10,655 Interest expense (2) (6,981) (7,433) (13,648) (14,584) Foreign currency transactions gains (losses) (443) 2,808 (2,426) 422 Other income — 1,804 — 1,694 Total other income (expense), net $ (652) $ 1,603 $ (2,468) $ (1,813) ____________________________________ (1) Interest income includes interest income related to our cash, cash equivalents and marketable securities and non-cash interest income (expense) related to accretion (amortization) of the discount (premium) on marketable securities. (2) Interest expense includes non-cash interest expense related to amortization of the debt discount and debt issuance costs of the Notes and the contractual interest expense related to the Notes and debt.

Segment Information - (Tables)

Segment Information - (Tables)	6 Months Ended
	Aug. 02, 2020
Segment Reporting [Abstract]
Revenue by Geographic Area	The following table depicts the disaggregation of revenue by geographic area based on the billing address of our customers and is consistent with how we evaluate our financial performance (in thousands): Second Quarter of Fiscal First Two Quarters of Fiscal 2020 2021 2020 2021 United States $ 294,596 $ 281,679 $ 523,535 $ 545,825 Rest of the world 101,731 122,044 199,492 225,017 Total revenue $ 396,327 $ 403,723 $ 723,027 $ 770,842
Long-Lived Assets by Geographic Area	Long-lived assets, which are comprised of property and equipment, net, by geographic area are summarized as follows (in thousands): At the End of Fiscal 2020 Second Quarter of Fiscal 2021 United States $ 113,942 $ 135,311 Rest of the world 8,798 9,815 Total long-lived assets $ 122,740 $ 145,126

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 02, 2020USD ($)	May 03, 2020	Aug. 02, 2020USD ($)numberOfRevenueSources	Jul. 31, 2019USD ($)	Feb. 02, 2020USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Depreciation and amortization			$ 31,597	$ 43,591
Restricted cash	$ 15,287		$ 15,287		$ 15,287
Number of revenue sources | numberOfRevenueSources			2
Test equipment, computer equipment and software
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life of assets		4 years
Test equipment, computer equipment and software | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life of assets					2 years
Test equipment, computer equipment and software | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life of assets					3 years
Change in accounting estimate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Depreciation and amortization	$ (6,300)		$ (14,100)

Basis of Presentation and Sum_4

Basis of Presentation and Summary of Significant Accounting Policies - Revenue Contract Term (Typed Dimensions) (Details)	Aug. 02, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-05-04
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue contractual term	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-08-03 | Subscription Service Revenue | Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue contractual term	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-08-03 | Subscription Service Revenue | Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue contractual term	6 years

Financial Instruments - Cash Eq

Financial Instruments - Cash Equivalents, Marketable Securities and Restricted Cash (Details) - USD ($) $ in Thousands	Aug. 02, 2020	Feb. 02, 2020
Debt Securities, Available-for-sale [Line Items]
Total	$ 923,519
Fair Value	937,514
Cash Equivalents	30,994	$ 14,069
Marketable securities	937,514	936,518
Restricted Cash	15,287	15,287
Amortized Cost	923,519	932,260
Total gross unrealized gains	14,001	7,263
Total gross unrealized losses	(6)	(4)
Total fair value	983,795	965,874
Level 1 | Money market accounts
Debt Securities, Available-for-sale [Line Items]
Fair Value	46,281	26,355
Cash Equivalents	30,994	11,068
Marketable securities	0	0
Restricted Cash	15,287	15,287
Level 2 | U.S. government treasury notes
Debt Securities, Available-for-sale [Line Items]
Total	365,487	323,751
Gross Unrealized Gains	4,926	2,146
Gross Unrealized Losses	0	0
Fair Value	370,413	325,897
Cash Equivalents	0	0
Marketable securities	370,413	325,897
Restricted Cash	0	0
Level 2 | U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Total	46,120	53,930
Gross Unrealized Gains	598	317
Gross Unrealized Losses	(4)	(3)
Fair Value	46,714	54,244
Cash Equivalents	0	0
Marketable securities	46,714	54,244
Restricted Cash	0	0
Level 2 | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total	405,307	452,318
Gross Unrealized Gains	6,550	3,954
Gross Unrealized Losses	(2)	(1)
Fair Value	411,855	456,271
Cash Equivalents	0	3,001
Marketable securities	411,855	453,270
Restricted Cash	0	0
Level 2 | Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Total	18,770	14,994
Gross Unrealized Gains	430	147
Gross Unrealized Losses	0	0
Fair Value	19,200	15,141
Cash Equivalents	0	0
Marketable securities	19,200	15,141
Restricted Cash	0	0
Level 2 | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total	87,835	87,267
Gross Unrealized Gains	1,497	699
Gross Unrealized Losses	0	0
Fair Value	89,332	87,966
Cash Equivalents	0	0
Marketable securities	89,332	87,966
Restricted Cash	$ 0	$ 0

Financial Instruments - Amortiz

Financial Instruments - Amortized Cost and Estimated Fair Value (Details) $ in Thousands	Aug. 02, 2020USD ($)
Amortized Cost
Due within one year	$ 354,472
Due in one to five years	569,047
Total	923,519
Fair Value
Due within one year	357,266
Due in one to five years	580,248
Total	$ 937,514

Financial Instruments - Gross U

Financial Instruments - Gross Unrealized Losses and Fair Values (Details) - USD ($) $ in Thousands	Aug. 02, 2020	Jul. 31, 2019
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less than 12 months	$ 6,305	$ 14,689
Unrealized Loss, Less than 12 Months	(6)	(4)
Fair Value, Greater than 12 months	0	1,000
Unrealized Loss, Greater than 12 months	0	0
Fair Value, Total	6,305	15,689
Unrealized Loss, Total	(6)	(4)
U.S. government treasury notes
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less than 12 months		0
Unrealized Loss, Less than 12 Months		0
Fair Value, Greater than 12 months		1,000
Unrealized Loss, Greater than 12 months		0
Fair Value, Total		1,000
Unrealized Loss, Total		0
U.S. government agencies
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less than 12 months	4,996	4,998
Unrealized Loss, Less than 12 Months	(4)	(3)
Fair Value, Greater than 12 months	0	0
Unrealized Loss, Greater than 12 months	0	0
Fair Value, Total	4,996	4,998
Unrealized Loss, Total	(4)	(3)
Corporate debt securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less than 12 months	1,309	9,691
Unrealized Loss, Less than 12 Months	(2)	(1)
Fair Value, Greater than 12 months	0	0
Unrealized Loss, Greater than 12 months	0	0
Fair Value, Total	1,309	9,691
Unrealized Loss, Total	$ (2)	$ (1)

Balance Sheet Components - Inve

Balance Sheet Components - Inventory (Details) - USD ($) $ in Thousands	Aug. 02, 2020	Feb. 02, 2020
Balance Sheet Components Disclosure [Abstract]
Raw materials	$ 3,647	$ 2,974
Finished goods	32,716	35,544
Inventory	$ 36,363	$ 38,518

Balance Sheet Components - Prop

Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Aug. 02, 2020	Feb. 02, 2020
Property Plant And Equipment [Line Items]
Total property and equipment	$ 434,240	$ 395,622
Less: accumulated depreciation and amortization	(289,114)	(272,882)
Property and equipment, net	145,126	122,740
Test equipment
Property Plant And Equipment [Line Items]
Total property and equipment	222,682	205,555
Computer equipment and software
Property Plant And Equipment [Line Items]
Total property and equipment	160,159	141,387
Furniture and fixtures
Property Plant And Equipment [Line Items]
Total property and equipment	8,831	8,324
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property and equipment	$ 42,568	$ 40,356

Balance Sheet Components - Narr

Balance Sheet Components - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Depreciation and amortization	$ 13.8	$ 19.9	$ 26.2	$ 39.7
Intangible assets amortization expense	$ 2.7	$ 2.6	$ 5.4	$ 3.9
Technology patents
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)			3 years 2 months 12 days
Developed technology
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)			5 years 6 months

Balance Sheet Components - Inta

Balance Sheet Components - Intangible Assets, Net (Details) - USD ($) $ in Thousands	Aug. 02, 2020	Feb. 02, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 75,225	$ 75,225
Accumulated Amortization	(22,370)	(16,968)
Net Carrying Amount	52,855	58,257
Technology patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	19,125	19,125
Accumulated Amortization	(10,327)	(8,933)
Net Carrying Amount	8,798	10,192
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	56,100	56,100
Accumulated Amortization	(12,043)	(8,035)
Net Carrying Amount	$ 44,057	$ 48,065

Balance Sheet Components - Expe

Balance Sheet Components - Expected Amortization Expenses for Intangible Assets (Details) - USD ($) $ in Thousands	Aug. 02, 2020	Feb. 02, 2020
Balance Sheet Components Disclosure [Abstract]
Remainder of 2021	$ 5,402
2022	9,846
2023	9,300
2024	9,300
2025	9,300
Thereafter	9,707
Net Carrying Amount	$ 52,855	$ 58,257

Balance Sheet Components - Good

Balance Sheet Components - Goodwill (Details) - USD ($)	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019	Feb. 02, 2020
Balance Sheet Components Disclosure [Abstract]
Goodwill	$ 37,584,000		$ 37,584,000		$ 37,584,000
Impairments to goodwill	$ 0	$ 0	$ 0	$ 0

Balance Sheet Components - Accr

Balance Sheet Components - Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Aug. 02, 2020	Feb. 02, 2020
Balance Sheet Components Disclosure [Abstract]
Taxes payable	$ 6,437	$ 9,012
Accrued marketing	12,865	7,679
Accrued travel and entertainment expenses	909	3,829
Acquisition consideration	2,628	6,149
Other accrued liabilities	23,979	20,554
Total accrued expenses and other liabilities	$ 46,818	$ 47,223

Deferred Revenue and Commissi_2

Deferred Revenue and Commissions - Deferred Commissions (Details) - USD ($)	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Revenue from Contract with Customer [Abstract]
Useful life of deferred commissions related to subscription services revenue			6 years
Deferred Commissions [Roll Forward]
Beginning balance	$ 139,204,000	$ 114,973,000	$ 142,363,000	$ 113,257,000
Additions	60,296,000	48,310,000	30,534,000	30,074,000
Recognition of deferred commissions	(54,813,000)	(44,715,000)	(28,210,000)	(24,763,000)
Ending balance	$ 144,687,000	118,568,000	$ 144,687,000	118,568,000
Commission expected to be recognized over the next 12 months (percent)	27.00%		27.00%
Impairment of capitalized commissions	$ 0	$ 0	$ 0	$ 0

Deferred Revenue and Commissi_3

Deferred Revenue and Commissions - Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Contract Liability
Additions	$ 60,296	$ 48,310	$ 30,534	$ 30,074
Recognition of deferred revenue	(54,813)	(44,715)	(28,210)	(24,763)
Product Revenue and Support Subscription Revenue
Contract Liability
Beginning balance	697,288	535,920	706,060	564,230
Additions	287,169	258,441	155,435	140,548
Recognition of deferred revenue	(259,706)	(187,098)	(136,744)	(97,515)
Ending balance	$ 724,751	$ 607,263	$ 724,751	$ 607,263

Deferred Revenue and Commissi_4

Deferred Revenue and Commissions - Remaining Performance Obligation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Revenue from Contract with Customer [Abstract]
Deferred revenue recognized	$ 119,400	$ 88,200	$ 204,600	$ 150,200
Contracted but not recognized revenue	$ 956,400		$ 956,400
Contracted but not recognized revenue expected to be recognized in the next 12 months (percent)	42.00%		42.00%

Deferred Revenue and Commissi_5

Deferred Revenue and Commissions - Remaining Performance Obligation Period (Details)	Aug. 02, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-05-04
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized term (in months)	12 months

Convertible Senior Notes - Narr

Convertible Senior Notes - Narrative (Details)	1 Months Ended	6 Months Ended
	Apr. 30, 2018USD ($)dayshares$ / shares	Aug. 02, 2020USD ($)$ / shares	Jul. 31, 2019USD ($)	Apr. 04, 2018
Debt Instrument [Line Items]
Proceeds from borrowing		$ 4,950,000	$ 0
Debt issuance costs, net of amortization	$ 12,900,000
Closing price of stock (in dollars per share) | $ / shares		$ 17.86
Capped Call
Debt Instrument [Line Items]
Payment for purchase of capped calls	64,600,000
Convertible Senior Notes
Debt Instrument [Line Items]
Debt issuance costs, net of amortization	9,800,000	$ 5,662,000	$ 6,615,000
Additional Paid-In Capital
Debt Instrument [Line Items]
Debt issuance costs, net of amortization	$ 3,068,000
Class A
Debt Instrument [Line Items]
Conversion price (in dollars per share) | $ / shares	$ 26.27
Closing price of stock (in dollars per share) | $ / shares		$ 17.86
Class A | Capped Call
Debt Instrument [Line Items]
Exercise price (in dollars per share) | $ / shares	$ 39.66
Exercise price premium percentage over last reported sales price				100.00%
Convertible Senior Notes
Debt Instrument [Line Items]
Principal amount	$ 575,000,000
Interest rate (as a percent)	0.125%
Proceeds from borrowing	$ 562,100,000
Conversion percentage of principal amount plus accrued and unpaid contingent interest	100.00%
Convertible debt, fair value based on the closing trading price per $100 of the Notes		$ 579,400,000
If-converted value		$ 390,900,000
Remaining term of the notes		32 months
Convertible Senior Notes | Class A
Debt Instrument [Line Items]
Number of convertible shares at initial conversion rate (in shares) | shares	21,884,155
Conversion ratio (in shares)	38.0594
Conversion price (in dollars per share) | $ / shares	$ 26.27
Redemption percentage of principal amount of Notes to be redeemed	100.00%
Convertible Senior Notes | Class A | Any Fiscal Quarter Commencing After the Fiscal Quarter Ending on July 31, 2018
Debt Instrument [Line Items]
Threshold trading days | day	20
Threshold consecutive trading days | day	30
Threshold percentage of stock price trigger	130.00%
Convertible Senior Notes | Class A | Five Business Day Period After any Five Consecutive Trading Day Period
Debt Instrument [Line Items]
Threshold consecutive trading days | day	5
Threshold percentage of stock price trigger	98.00%
Threshold business days | day	5
Convertible Senior Notes | Class A | Immediately Preceding the Date on Which We Provide Notice of Redemption
Debt Instrument [Line Items]
Threshold trading days | day	2

Convertible Senior Notes - Conv

Convertible Senior Notes - Convertible Debt (Details) - USD ($) $ in Thousands	1 Months Ended
	Apr. 30, 2018	Aug. 02, 2020	Jul. 31, 2019
Liability:
Less: debt issuance costs, net of amortization	$ (12,900)
Stockholders' equity recorded at issuance:
Less: debt issuance costs	(12,900)
Convertible Senior Notes
Liability:
Principal		$ 575,000	$ 575,000
Less: debt discount, net of amortization		(78,206)	(91,378)
Less: debt issuance costs, net of amortization	(9,800)	(5,662)	(6,615)
Net carrying amount of the Notes		491,132	477,007
Stockholders' equity recorded at issuance:
Less: debt issuance costs	(9,800)	$ (5,662)	$ (6,615)
Additional Paid-In Capital
Liability:
Less: debt issuance costs, net of amortization	(3,068)
Stockholders' equity recorded at issuance:
Allocated value of the conversion feature	136,333
Less: debt issuance costs	(3,068)
Additional paid-in capital	$ 133,265

Convertible Senior Notes - Inte

Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Debt Instrument [Line Items]
Total amortization of debt discount and debt issuance costs			$ 14,125	$ 13,290
Convertible Senior Notes
Debt Instrument [Line Items]
Amortization of debt discount	$ 6,703	$ 6,341	13,171	12,393
Amortization of debt issuance costs	486	459	954	897
Total amortization of debt discount and debt issuance costs	7,189	6,800	14,125	13,290
Contractual interest expense	181	181	358	358
Total interest expense related to the Notes	$ 7,370	$ 6,981	$ 14,483	$ 13,648
Effective interest rate of the liability component	5.60%	5.60%	5.60%	5.60%

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	Aug. 02, 2020	Feb. 02, 2020
Commitments and Contingencies Disclosure [Abstract]
Outstanding letters of credit	$ 11.5	$ 11.5

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Thousands	Aug. 02, 2020USD ($)
Lessee, Lease, Description [Line Items]
Total future lease payments	$ 166,484
Operating lease, weighted average remaining lease term	5 years 6 months
Weighted-average discount rate (as a percent)	6.08%
Data Center
Lessee, Lease, Description [Line Items]
Total future lease payments	$ 22,400

Leases - Lease costs (Details)

Leases - Lease costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Leases [Abstract]
Fixed operating lease cost	$ 9,532	$ 8,228	$ 18,281	$ 16,711
Variable lease cost	2,291	2,242	4,942	4,342
Short-term lease cost (12 months or less)	1,559	1,484	3,066	2,345
Total lease cost	$ 13,382	$ 11,954	$ 26,289	$ 23,398

Leases - Future minimum lease p

Leases - Future minimum lease payments (Details) $ in Thousands	Aug. 02, 2020USD ($)
Leases [Abstract]
The remainder of 2021	$ 18,983
2022	34,869
2023	30,180
2024	24,776
2025	21,582
Thereafter	36,094
Total future lease payments	166,484
Less: imputed interest	(27,361)
Present value of lease liabilities	$ 139,123

Restructuring and Related Activ

Restructuring and Related Activities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Aug. 02, 2020	Aug. 02, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.8	$ 6.6
COVID-19 Pandemic Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		9.8
COVID-19 Pandemic Costs | Restructuring and Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges		8.9
COVID-19 Pandemic Costs | Cost of Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0.9
Ceased Use of Certain Leased Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 7.5	$ 7.5

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details)	3 Months Ended	6 Months Ended
	Aug. 02, 2020USD ($)stock_class$ / sharesshares	Aug. 02, 2020USD ($)stock_class$ / sharesshares	Feb. 02, 2020$ / sharesshares	Aug. 31, 2019USD ($)
Class of Stock [Line Items]
Shares authorized (in shares)	20,000,000	20,000,000	20,000,000
Shares issued (in shares)	0	0	0
Shares outstanding (in shares)	0	0	0
Number of classes of stock | stock_class	2	2
Shares authorized (in shares)	2,250,000,000	2,250,000,000	2,250,000,000
Stock repurchased and retired (in shares)	1,176,761	7,136,191
Stock repurchased and retired during period, value | $	$ 20,000,000	$ 90,000,000
Shares repurchased and retired, average purchase price (in dollars per share) | $ / shares	$ 17	$ 12.61
Authorized amount remaining under stock repurchase program | $	$ 45,000,000	$ 45,000,000
Class A
Class of Stock [Line Items]
Shares authorized (in shares)	2,000,000,000	2,000,000,000	2,000,000,000
Par value per share (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001	$ 0.0001
Shares issued (in shares)	267,776,462	267,776,462	264,008,000
Shares outstanding (in shares)	267,776,462	267,776,462	264,008,000
Value approved For repurchase | $				$ 150,000,000
Class B
Class of Stock [Line Items]
Shares authorized (in shares)	250,000,000	250,000,000	250,000,000
Par value per share (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001	$ 0.0001

Equity Incentive Plans - Narrat

Equity Incentive Plans - Narrative (Details)	3 Months Ended		6 Months Ended
	Aug. 02, 2020USD ($)periodshares	Jul. 31, 2019USD ($)	Aug. 02, 2020USD ($)planperiodshares	Jul. 31, 2019USD ($)
Share-based Payment Arrangement [Abstract]
Number of equity incentive plans | plan			2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards expiration period (no later than)			10 years
Total stock-based compensation expense	$ 61,452,000	$ 58,404,000	$ 120,146,000	$ 120,561,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			2 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			4 years
2015 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan offering period			24 months
Number of purchase periods | period	4		4
Purchase period, term			6 months
Total stock-based compensation expense	$ 6,400,000	$ 4,200,000	$ 12,000,000	$ 15,700,000
Unrecognized stock-based compensation expense	$ 41,200,000		$ 41,200,000
Compensation cost (in years)			1 year 7 months 6 days
2015 Employee Stock Purchase Plan | Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price as percentage of fair market value of common stock			85.00%
Payroll deductions percentage	30.00%		30.00%
Share cap for ESPP at purchase date (in shares) | shares	3,000		3,000
Calendar year gap for ESPP contribution amount			$ 25,000
Dollar cap per purchase period			7,500
Modification charges			$ 23,800,000

Equity Incentive Plans - Equity

Equity Incentive Plans - Equity Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Aug. 02, 2020	May 03, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019	Feb. 02, 2020
Options Outstanding, Number of Shares
Beginning balance (in shares)		26,822,243		26,822,243
Options exercised (in shares)				(4,312,894)
Options forfeited (in shares)				(125,685)
Ending balance (in shares)	22,383,664			22,383,664
Vested and exercisable (in shares)	20,369,881			20,369,881
Options Outstanding, Weighted Average Exercise Price
Beginning balance (in dollars per share)		$ 8.97		$ 8.97
Options exercised (in dollars per share)				5.01
Options forfeited/canceled (in dollars per share)				16.54
Ending balance (in dollars per share)	$ 9.70			9.70
Weighted Average Exercise Price, Vested and exercisable (in dollars per share)	$ 9.06			$ 9.06
Weighted- Average Remaining Contractual Life
Weighted Average Remaining Contractual Life (in years)		3 years 10 months 24 days		4 years 2 months 12 days
Weighted Average Remaining Contractual Life, Vested and exercisable (in years)				4 years 1 month 6 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 183,708			$ 183,708		$ 237,803
Aggregate Intrinsic Value, Vested and exercisable	$ 179,477			$ 179,477
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of stock (in dollars per share)	$ 17.86			$ 17.86
Total stock-based compensation expense	$ 61,452		$ 58,404	$ 120,146	$ 120,561
Unrecognized compensation cost, stock options	6,400			$ 6,400
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)				2 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)				4 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 4,500		$ 2,100	$ 4,100	$ 10,000
Compensation cost (in years)				1 year
Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of stock (in dollars per share)	$ 17.86			$ 17.86

Equity Incentive Plans - Restri

Equity Incentive Plans - Restricted Stock Units (Details) - Unvested RSUs and PRSUs - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019	Feb. 02, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, target (as a percent)	100.00%
Number of Restricted Stock Units Outstanding
Unvested, Beginning balance (in shares)			25,434,597
Granted (in shares)	1,451,896		14,461,995
Vested (in shares)			(5,454,940)
Forfeited (in shares)			(1,643,740)
Unvested, Ending balance (in shares)	32,797,912		32,797,912
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)			$ 18.72
Granted (in dollars per share)			11.27
Vested (in dollars per share)			16.93
Forfeited (in dollars per share)			17.34
Ending balance (in dollars per share)	$ 15.80		$ 15.80
Aggregate Intrinsic Value	$ 585,770		$ 585,770		$ 452,736
Share-based compensation expense	50,100	$ 40,400	96,900	$ 77,700
Compensation not yet recognized	$ 472,500		$ 472,500
Compensation cost (in years)			2 years 10 months 24 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, target (as a percent)	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, target (as a percent)	125.00%

Equity Incentive Plans - Rest_2

Equity Incentive Plans - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019	Feb. 02, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 61,452	$ 58,404	$ 120,146	$ 120,561
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2,800	$ 7,400	7,100	$ 14,800
Unrecognized stock-based compensation expense	$ 7,100		$ 7,100
Compensation cost (in years)			1 year 4 months 24 days
Number of Restricted Stock Outstanding
Unvested, Beginning balance (in shares)			2,127,206
Vested (in shares)			(787,698)
Forfeited/canceled (in shares)			(229,605)
Unvested, Ending balance (in shares)	1,109,903		1,109,903
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)			$ 19.58
Vested (in dollars per share)			19.54
Forfeited/canceled (in dollars per share)			20.15
Ending balance (in dollars per share)	$ 19.49		$ 19.49
Aggregate Intrinsic Value	$ 19,823		$ 19,823		$ 37,684

Equity Incentive Plans - Stock-

Equity Incentive Plans - Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 61,452	$ 58,404	$ 120,146	$ 120,561
Cost of revenue—product
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	990	954	1,986	1,931
Cost of revenue—subscription services
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	3,686	3,633	7,078	7,584
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	29,839	29,108	58,550	57,353
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	16,848	16,055	33,120	34,369
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 10,089	$ 8,654	$ 19,412	$ 19,324

Net Loss per Share Attributab_3

Net Loss per Share Attributable to Common Stockholders - Net Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Earnings Per Share [Abstract]
Net loss	$ (64,967)	$ (66,018)	$ (155,561)	$ (166,354)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	264,799	251,298	263,867	248,336
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.25)	$ (0.26)	$ (0.59)	$ (0.67)

Net Loss per Share Attributab_4

Net Loss per Share Attributable to Common Stockholders - Shares Excluded (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount (in shares)	81,775	82,773	81,095	82,976
Stock options to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount (in shares)	23,329	31,739	24,482	32,852
Unvested RSUs and PRSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount (in shares)	33,286	25,513	31,216	24,743
Restricted stock subject to repurchase
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount (in shares)	1,236	2,917	1,473	2,777
Shares related to convertible senior notes
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount (in shares)	21,884	21,884	21,884	21,884
Shares issuable pursuant to the ESPP
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount (in shares)	2,040	720	2,040	720

Other Income (Expense), Net - O

Other Income (Expense), Net - Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Other Income and Expenses [Abstract]
Interest income	$ 4,424	$ 6,772	$ 10,655	$ 13,606
Interest expense	(7,433)	(6,981)	(14,584)	(13,648)
Foreign currency transactions gains (losses)	2,808	(443)	422	(2,426)
Other income	1,804	0	1,694	0
Total other income (expense), net	$ 1,603	$ (652)	$ (1,813)	$ (2,468)

Segment Information - Narrative

Segment Information - Narrative (Details)	6 Months Ended
	Aug. 02, 2020segmentmanager
Segment Reporting [Abstract]
Number of business activities	1
Number of reportable segments	1
Number of segment managers held accountable for operations or operating results | manager	0

Segment Information - Revenue b

Segment Information - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 403,723	$ 396,327	$ 770,842	$ 723,027
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	281,679	294,596	545,825	523,535
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 122,044	$ 101,731	$ 225,017	$ 199,492

Segment Information - Long-Live

Segment Information - Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Aug. 02, 2020	Feb. 02, 2020
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 145,126	$ 122,740
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	135,311	113,942
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 9,815	$ 8,798

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event - Revolving Credit Facility	Aug. 24, 2020USD ($)
Subsequent Event [Line Items]
Term of credit facility	5 years
Senior secured revolving credit facility maximum capacity	$ 300,000,000
Maximum consolidated leverage ratio	4.5
Minimum interest coverage ratio	3
London Interbank Offered Rate (LIBOR)
Subsequent Event [Line Items]
Floor interest rate (percent)	0.00%
Minimum
Subsequent Event [Line Items]
Commitment Fee (percent)	0.25%
Minimum | Base Rate
Subsequent Event [Line Items]
Margin rate (percent)	0.50%
Minimum | London Interbank Offered Rate (LIBOR)
Subsequent Event [Line Items]
Margin rate (percent)	1.50%
Maximum
Subsequent Event [Line Items]
Commitment Fee (percent)	0.40%
Maximum | Base Rate
Subsequent Event [Line Items]
Margin rate (percent)	1.25%
Maximum | London Interbank Offered Rate (LIBOR)
Subsequent Event [Line Items]
Margin rate (percent)	2.25%