Pure Storage (PSTG) 10-Q 9 Dec 19 2020 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Oct. 31, 2019	Dec. 04, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Oct. 31, 2019
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
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
Title of 12(b) Security	Class A Common Stock, $0.0001 par value per share
Trading Symbol	PSTG
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding (in shares)		260,375,453
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001474432
Current Fiscal Year End Date	--01-31

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Current assets:
Cash and cash equivalents	$ 304,346	$ 447,990
Marketable securities	936,969	749,482
Accounts receivable, net of allowance of $660 and $589 as of January 31, 2019 and October 31, 2019	362,115	378,729
Inventory	39,851	44,687
Deferred commissions, current	32,360	29,244
Prepaid expenses and other current assets	46,539	51,695
Total current assets	1,722,180	1,701,827
Property and equipment, net	130,236	125,353
Operating lease right-of-use assets	119,403
Deferred commissions, non-current	90,771	85,729
Intangible assets, net	61,028	20,118
Goodwill	36,420	10,997
Deferred income taxes, non-current	1,239	1,060
Restricted cash	15,287	15,823
Other assets, non-current	16,215	12,118
Total assets	2,192,779	1,973,025
Current liabilities:
Accounts payable	59,650	103,462
Accrued compensation and benefits	59,901	99,910
Accrued expenses and other liabilities	48,223	39,860
Operating lease liabilities, current	26,574
Deferred revenue, current	325,947	266,584
Total current liabilities	520,295	509,816
Convertible senior notes, net	470,014	449,828
Operating lease liabilities, non-current	100,023
Deferred revenue, non-current	317,251	269,336
Deferred tax liabilities, non-current	5,658	0
Other liabilities, non-current	1,588	6,265
Total liabilities	1,414,829	1,235,245
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock, par value of $0.0001 per share— 20,000 shares authorized as of January 31, 2019 and October 31, 2019; no shares issued and outstanding as of January 31, 2019 and October 31, 2019	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 as of January 31, 2019 and October 31, 2019; 243,524 and 259,920 Class A shares issued and outstanding as of January 31, 2019 and October 31, 2019	26	24
Additional paid-in capital	2,051,093	1,820,043
Accumulated other comprehensive income (loss)	5,116	(338)
Accumulated deficit	(1,278,285)	(1,081,949)
Total stockholders’ equity	777,950	737,780
Total liabilities and stockholders’ equity	$ 2,192,779	$ 1,973,025

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Accounts receivable, allowance	$ 589	$ 660
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)	259,920,406	243,524,000
Shares outstanding (in shares)	259,920,406	243,524,000
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		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Revenue	$ 428,409	$ 372,779	$ 1,151,436	$ 937,608
Cost of revenue	127,771	123,659	366,092	316,008
Gross profit	300,638	249,120	785,344	621,600
Operating expenses:
Research and development	106,663	90,783	318,758	253,306
Sales and marketing	184,819	146,903	537,633	413,019
General and administrative	37,416	38,651	119,542	99,572
Total operating expenses	328,898	276,337	975,933	765,897
Loss from operations	(28,260)	(27,217)	(190,589)	(144,297)
Other income (expense), net	9	(2,889)	(2,459)	(7,920)
Loss before provision (benefit) for income taxes	(28,251)	(30,106)	(193,048)	(152,217)
Income tax provision (benefit)	1,731	(1,926)	3,288	390
Net loss	$ (29,982)	$ (28,180)	$ (196,336)	$ (152,607)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.12)	$ (0.12)	$ (0.78)	$ (0.66)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	255,047	235,205	250,618	229,505
Product
Revenue	$ 323,268	$ 298,863	$ 862,137	$ 735,449
Cost of revenue	89,998	96,610	259,460	241,292
Support subscription
Revenue	105,141	73,916	289,299	202,159
Cost of revenue	$ 37,773	$ 27,049	$ 106,632	$ 74,716

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (29,982)	$ (28,180)	$ (196,336)	$ (152,607)
Other comprehensive income (loss) net of tax:
Change in unrealized net gain (loss) on available-for-sale securities	1,707	(273)	5,454	(1,182)
Comprehensive loss	$ (28,275)	$ (28,453)	$ (190,882)	$ (153,789)

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 Units	Restricted Stock UnitsCommon Stock	Restricted Stock UnitsAdditional Paid-In Capital	Restricted StockCommon Stock
Beginning balance (in shares) at Jan. 31, 2018		220,979
Beginning balance at Jan. 31, 2018	$ 574,401	$ 22	$ 1,479,883	$ (1,917)	$ (903,587)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		8,250
Issuance of common stock upon exercise of stock options	43,378	$ 1	43,377
Stock-based compensation expense	155,938		155,938
Vesting of early exercised stock options	320		320
Vesting of restricted stock units (in shares)							6,429
Common stock issued under employee stock purchase plan (in shares)		3,380
Common stock issued under employee stock purchase plan	33,444		33,444
Net issuance of restricted stock (in shares)									3,330
Net issuance of restricted stock						$ 1			$ 1
Repurchase of common stock (in shares)		(1,009)
Repurchase of common stock	(20,000)		(20,000)
Purchase of capped calls	(64,630)		(64,630)
Equity component of convertible senior notes, net	133,265		133,265
Other comprehensive income (loss)	(1,182)			(1,182)
Net loss	(152,607)				(152,607)
Ending balance (in shares) at Oct. 31, 2018		241,359
Ending balance at Oct. 31, 2018	702,328	$ 24	1,761,597	(3,099)	(1,056,194)
Beginning balance (in shares) at Jul. 31, 2018		235,412
Beginning balance at Jul. 31, 2018	644,394	$ 24	1,675,210	(2,826)	(1,028,014)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		2,366
Issuance of common stock upon exercise of stock options	14,312		14,312
Stock-based compensation expense	58,329		58,329
Vesting of restricted stock units (in shares)							2,312
Common stock issued under employee stock purchase plan (in shares)		1,269
Common stock issued under employee stock purchase plan	13,746		13,746
Other comprehensive income (loss)	(273)			(273)
Net loss	(28,180)				(28,180)
Ending balance (in shares) at Oct. 31, 2018		241,359
Ending balance at Oct. 31, 2018	702,328	$ 24	1,761,597	(3,099)	(1,056,194)
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)		4,797
Issuance of common stock upon exercise of stock options	26,006	$ 1	26,005
Stock-based compensation expense	170,542		170,542
Vesting of restricted stock units (in shares)							6,884
Vesting of restricted stock units						$ 0	$ 1	$ (1)
Common stock issued under employee stock purchase plan (in shares)		3,743
Common stock issued under employee stock purchase plan	43,291		43,291
Net issuance of restricted stock (in shares)									972
Tax withholding on vesting of restricted stock	(8,787)		(8,787)
Other comprehensive income (loss)	5,454			5,454
Net loss	(196,336)				(196,336)
Ending balance (in shares) at Oct. 31, 2019		259,920
Ending balance at Oct. 31, 2019	777,950	$ 26	2,051,093	5,116	(1,278,285)
Beginning balance (in shares) at Jul. 31, 2019		255,752
Beginning balance at Jul. 31, 2019	737,539	$ 26	1,982,407	3,409	(1,248,303)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		934
Issuance of common stock upon exercise of stock options	6,715		6,715
Stock-based compensation expense	52,336		52,336
Vesting of restricted stock units (in shares)							2,557
Common stock issued under employee stock purchase plan (in shares)		770
Common stock issued under employee stock purchase plan	11,249		11,249
Net issuance of restricted stock (in shares)									(93)
Tax withholding on vesting of restricted stock	(1,614)		(1,614)
Other comprehensive income (loss)	1,707			1,707
Net loss	(29,982)				(29,982)
Ending balance (in shares) at Oct. 31, 2019		259,920
Ending balance at Oct. 31, 2019	$ 777,950	$ 26	$ 2,051,093	$ 5,116	$ (1,278,285)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (196,336)	$ (152,607)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	66,785	51,381
Amortization of debt discount and debt issuance costs	20,186	14,414
Stock-based compensation expense	174,790	155,938
Other	(483)	(5,037)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable, net	17,079	(62,623)
Inventory	2,722	(17,103)
Deferred commissions	(8,158)	(9,127)
Prepaid expenses and other assets	1,464	1,996
Operating lease right-of-use assets	19,962
Accounts payable	(35,244)	11,800
Accrued compensation and other liabilities	(31,011)	7,592
Operating lease liabilities	(19,020)
Deferred revenue	106,980	87,005
Net cash provided by operating activities	119,716	83,629
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(74,206)	(70,807)
Acquisitions, net of cash acquired	(51,594)	(13,899)
Purchase of intangible assets	(9,000)	0
Purchases of marketable securities	(640,024)	(558,248)
Sales of marketable securities	116,518	18,802
Maturities of marketable securities	345,657	156,049
Net cash used in investing activities	(312,649)	(468,103)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from exercise of stock options	25,804	43,342
Proceeds from issuance of common stock under employee stock purchase plan	43,291	33,444
Proceeds from issuance of convertible senior notes, net of issuance costs	0	562,062
Payment for purchase of capped calls	0	(64,630)
Repayment of debt assumed from acquisitions	(11,555)	(6,101)
Tax withholding on vesting of restricted stock	(8,787)	0
Repurchase of common stock	0	(20,000)
Net cash provided by financing activities	48,753	548,117
Net increase (decrease) in cash, cash equivalents and restricted cash	(144,180)	163,643
Cash, cash equivalents and restricted cash, beginning of period	463,813	258,820
Cash, cash equivalents and restricted cash, end of period	319,633	422,463
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD:
Cash, cash equivalents and restricted cash, end of period	319,633	422,463
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for income taxes	3,398	4,121
Cash paid for interest	718	371
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION
Property and equipment purchased but not yet paid	5,202	14,605
Acquisition consideration held back to satisfy potential indemnification claims	0	3,725
Vesting of early exercised stock options	$ 0	$ 320

Business Overview

Business Overview	9 Months Ended
	Oct. 31, 2019
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. We help innovators to build a better world with data. Our innovative data platform replaces storage systems designed for mechanical disk with all-flash systems optimized for end-to-end for solid-state memory. Our cloud-based management and support platform helps predictively resolve potential issues and simplify storage administration. We provide a customer first business model that replaces the traditional forklift upgrade cycle with a subscription model built to keep customers on the cutting edge without downtime or performance impact.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Oct. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Principles of Consolidation 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. New fiscal year end In September 2019, we adopted a fiscal year consisting of four 13-week quarters, which will be effective for our fourth quarter beginning on November 1, 2019 and ending on February 2, 2020. Each quarter will start on a Monday and end on a Sunday. Fiscal year 2021 will start on February 3, 2020 and end on January 31, 2021, and will be comprised of four fiscal quarters ending on May 3, 2020, August 2, 2020, November 1, 2020 and January 31, 2021, respectively. The updated calendar will occasionally include a 14-week fourth quarter, which will first occur in fiscal year 2022, starting on November 1, 2021 and ending on February 6, 2022. 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 the year ended January 31, 2019. 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 2020 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. 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, property and equipment, the period of benefit for deferred contract costs for commissions, stock-based compensation, provision for income taxes including related reserves, valuation of intangible assets and goodwill, the incremental borrowing rate we use to determine our operating lease liabilities. 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 is comprised of cash collateral for letters of credit related to our leases and for a vendor credit card program. As of January 31, 2019 and October 31, 2019, we had restricted cash of $15.8 million and $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 to assess whether those with unrealized loss positions are other than temporarily impaired. We consider impairments to be other than temporary if they are related to deterioration in credit risk or if it is likely we will sell the securities before the recovery of their cost basis. Realized gains and losses from the sale of marketable securities and declines in value deemed to be other than temporary are determined on the specific identification method. To date, there have been no declines in value deemed to be other than temporary in any of our securities. 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. 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 support subscription revenue are amortized over an expected useful life of six Changes in total deferred commissions during the periods presented are as follows (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Beginning balance (1) $ 91,469 $ 118,568 $ 87,313 $ 114,973 Additions 31,884 34,071 71,887 82,381 Recognition of deferred commissions (26,913) (29,508) (62,760) (74,223) Ending balance $ 96,440 $ 123,131 $ 96,440 $ 123,131 ____________________________________ (1) Balance as of January 31, 2018 was adjusted to reflect the adoption of ASC 606. Of the $123.1 million total deferred commissions balance as of October 31, 2019, we expect to recognize approximately 26% as commission expense over the next 12 months and the remainder thereafter. There was no impairment related to capitalized commissions for the three and nine months ended October 31, 2018 and 2019. 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. Deferred Revenue Deferred revenue primarily consists of amounts that have been invoiced but that have not yet been recognized as revenue and performance obligations pertaining to support 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): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Beginning balance (1) $ 413,247 $ 607,263 $ 374,102 $ 535,920 Additions 122,681 142,164 290,463 400,605 Recognition of deferred revenue (74,740) (106,229) (203,377) (293,327) Ending balance $ 461,188 $ 643,198 $ 461,188 $ 643,198 ____________________________________ (1) Balance as of January 31, 2018 was adjusted to reflect the adoption of ASC 606. During the three and nine months ended October 31, 2018, we recognized $67.0 million and $151.4 million in revenue pertaining to deferred revenue as of the beginning of each period. During the three and nine months ended October 31, 2019, we recognized $101.4 million and $213.2 million in revenue pertaining to deferred revenue as of the beginning of each period. Total contracted but not recognized revenue was $810.8 million as of October 31, 2019. Contracted but not recognized revenue consists of both deferred revenue and non-cancelable amounts that will be invoiced and recognized as revenue in future periods. Of the $810.8 million contracted but not recognized revenue as of October 31, 2019, we expect to recognize approximately 41% over the next 12 months, and the remainder thereafter. Revenue Recognition We derive revenue from two sources: (1) product revenue which includes hardware and embedded software and (2) support subscription revenue which includes customer support, hardware maintenance, and software upgrades on a when-and-if-available basis. Support subscription revenue also includes our Pure as-a-Servic e offerings, including the offering formerly known as Evergreen Storage Service (ES2). Our product revenue is derived from the sale of storage hardware and operating system software that is integrated into the hardware. We typically recognize product revenue upon transfer of control to our customers. Products are typically shipped directly by us to customers, and our channel partners do not stock our inventory. Our support subscription revenue is derived from the sale of support subscription, which includes the right to receive unspecified software upgrades and enhancements on a when-and-if-available basis, bug fixes, parts replacement services related to the hardware, as well as access to our cloud-based management and support platform. Support subscription revenue is also derived from the sale of our Pure as-a-Service offerings. Revenue related to support revenue is recognized ratably over the contractual term, which generally ranges from one to six years and represents our performance obligations period. The vast majority of our products are sold with support subscription agreements, which typically commence upon transfer of control of the corresponding products to our customers. Costs to service the support subscription are expensed as incurred. In addition, our Evergreen Storage program provides our customers who continually maintain active support subscription agreements for three years with an included controller refresh with each additional three year support subscription renewal. In accordance with revenue recognition guidance, the controller refresh represents an additional performance obligation and the allocated revenue is recognized in the period in which these controllers are shipped. 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 are capable of being distinct in the context of the contract to 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 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. Recently Adopted Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2016-02, Leases (ASC 842) and subsequent amendments to the initial guidance (collectively, Topic 842). ASC 842 requires lessees to generally recognize on its balance sheet operating and financing lease liabilities and corresponding ROU assets at the commencement date, and to recognize the associated lease expenses in the condensed consolidated statement of operations in a manner similar to that required under historical accounting rules. On February 1, 2019, we adopted ASC 842 using the modified retrospective approach by electing to use the optional transition method which allows us to continue to apply the guidance of ASC 840, including disclosure requirements, in the comparative periods presented. We elected the package of transition expedients, which allowed us to carry forward our historical lease classifications, our assessment of whether any existing leases as of the date of adoption are or contain leases, and our assessment of indirect costs for any leases that existed prior to adoption of the new standard. We elected to take the practical expedient to keep leases with an initial term of 12 months or less off the condensed consolidated balance sheet and recognize the associated lease payments in the consolidated statements of operations on a straight-line basis over the lease term. We recognized operating ROU assets of $124.5 million and lease liabilities of $130.6 million on our condensed consolidated balance sheet as of February 1, 2019, which included reclassifying prepaid rent and deferred rent as a component of the ROU asset. Topic 842 did not have a material impact on our condensed consolidated statements of operations and cash flows. Refer to Note 8 for additional disclosures. In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This standard allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017 and requires certain disclosures about stranded tax effects. We adopted this standard on February 1, 2019 and the adoption had no impact on our condensed consolidated financial statements. Recent Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13). ASU 2016-13 amends guidance on reporting credit losses for assets held at amortized cost basis and available-for-sale debt securities to require that credit losses on available-for-sale debt securities be presented as an allowance rather than as a write-down. The measurement of credit losses for newly recognized financial assets and subsequent changes in the allowance for credit losses are recorded in the statements of operations. The amendments in this update will be effective for us beginning on February 3, 2020. We do not believe the adoption of this standard will have a material impact to our condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820), Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement (ASU 2018-13) which amended its conceptual framework to improve the effectiveness of disclosures in notes to financial statements. ASU 2018-13 eliminates such disclosures around the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy. The guidance also adds new disclosure requirements for Level 3 measurements. ASU 2018-13 is effective for us beginning February 3, 2020. We do not believe this standard will have a material impact on our condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (ASU 2018-15). ASC 2018-15 aligns the requirements for capitalizing implementation costs in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This standard will be effective for us beginning February 3, 2020 and will be applied either retrospectively or prospectively. We plan to adopt this new accounting standard prospectively, and we do not expect the adoption will have a material impact on our condensed consolidated financial statements.

Financial Instruments

Financial Instruments	9 Months Ended
	Oct. 31, 2019
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 October 31, 2019 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 as of October 31, 2019. Cash Equivalents, Marketable Securities and Restricted Cash The following tables summarize our cash equivalents, marketable securities and restricted cash by significant investment categories as of January 31, 2019 and October 31, 2019 (in thousands): As of January 31, 2019 Amortized Gross Unrealized Gross Unrealized Fair Cash Equivalents Marketable Securities Restricted Cash Level 1 Money market accounts $ — $ — $ — $ 43,038 $ 27,215 $ — $ 15,823 Level 2 U.S. government treasury notes 315,329 208 (315) 315,222 34,129 281,093 — U.S. government agencies 69,114 17 (154) 68,977 9,983 58,994 — Corporate debt securities 363,860 534 (757) 363,637 — 363,637 — Foreign government bonds 7,965 36 — 8,001 — 8,001 — Asset-backed securities 37,664 105 (12) 37,757 — 37,757 — Total $ 793,932 $ 900 $ (1,238) $ 836,632 $ 71,327 $ 749,482 $ 15,823 As of October 31, 2019 Amortized Gross Unrealized Gross Unrealized Fair Cash Equivalents Marketable Restricted Cash Level 1 Money market accounts $ — $ — $ — $ 20,372 $ 5,085 $ — $ 15,287 Level 2 U.S. government treasury notes 350,325 2,165 (30) 352,460 — 352,460 — U.S. government agencies 42,120 331 (1) 42,450 — 42,450 — Corporate debt securities 436,842 3,800 (10) 440,632 2,361 438,271 — Foreign government bonds 14,988 131 (5) 15,114 — 15,114 — Asset-backed securities 88,222 466 (14) 88,674 — 88,674 — Total $ 932,497 $ 6,893 $ (60) $ 959,702 $ 7,446 $ 936,969 $ 15,287 The amortized cost and estimated fair value of our marketable securities are shown below by contractual maturity (in thousands): As of October 31, 2019 Amortized Cost Fair Value Due within one year $ 427,200 $ 429,154 Due in one to five years 502,936 507,815 Total $ 930,136 $ 936,969 Based on our evaluation of available evidence, we concluded that the gross unrealized losses on our investments as of October 31, 2019 were temporary in nature. The following table presents gross unrealized losses and fair values for those investments that were in a continuous unrealized loss position as of October 31, 2019, aggregated by investment category (in thousands): Less than 12 months Greater than 12 months Total Fair Unrealized Fair Unrealized Fair Unrealized U.S. government treasury notes $ 23,968 $ (27) $ 3,623 $ (3) $ 27,591 $ (30) U.S. government agencies — — 1,938 (1) 1,938 (1) Corporate debt securities 11,532 (7) 10,366 (3) 21,898 (10) Foreign government bonds 2,964 (5) — — 2,964 (5) Asset-backed securities 16,130 (14) — — 16,130 (14) Total $ 54,594 $ (53) $ 15,927 $ (7) $ 70,521 $ (60) Realized gains or losses on sale of marketable securities were not significant for all periods presented.

Business Combination

Business Combination	9 Months Ended
	Oct. 31, 2019
Business Combinations [Abstract]
Business Combination	Business Combination In April 2019, we acquired Compuverde AB (Compuverde), a privately-held developer of file software solutions for enterprises and cloud providers based in Sweden. Acquisition-related costs were $0.5 million and expensed as incurred. The purchase consideration was $47.9 million in cash (net of cash acquired) after repayment of $11.6 million of debt assumed. The purchase price was allocated as follows: $38.4 million in developed technology which will be amortized over seven years, $25.4 million of goodwill, $10.2 million in net liabilities assumed, and $5.7 million in deferred tax liability. The deferred tax liability was primarily a result of the difference in the book basis and tax basis related to the developed technology. Goodwill is primarily attributable to the assembled workforce and synergies from integrating Compuverde's technology with our data platform to expand our file capabilities and is not expected to be deductible for tax purposes. In addition, cash payments to former shareholders of Compuverde totaling $15.9 million are to be made over a two Restricted stock units in the amount of $3.0 million were issued to Compuverde employees in June 2019, subject to continuous employment and will be recognized as stock-based compensation over the related vesting period. The results of Compuverde are included in our condensed consolidated statements of operations since the acquisition date, including revenue and net loss, and are not material. Pro forma results of operations have not been presented because the acquisition is not material to our results of operations.

Balance Sheet Components

Balance Sheet Components	9 Months Ended
	Oct. 31, 2019
Balance Sheet Components Disclosure [Abstract]
Balance Sheet Components	Balance Sheet Components Inventory Inventory consists of the following (in thousands): As of January 31, 2019 As of October 31, 2019 Raw materials $ 3,349 $ 3,163 Finished goods 41,338 36,688 Inventory $ 44,687 $ 39,851 Property and Equipment, Net Property and equipment, net consists of the following (in thousands): As of January 31, 2019 As of October 31, 2019 Test equipment $ 170,930 $ 199,878 Computer equipment and software 117,330 139,188 Furniture and fixtures 6,980 8,483 Leasehold improvements 34,286 40,235 Total property and equipment 329,526 387,784 Less: accumulated depreciation and amortization (204,173) (257,548) Property and equipment, net $ 125,353 $ 130,236 Depreciation and amortization expense was $16.9 million and $20.6 million for the three months ended October 31, 2018 and 2019, and $49.8 million and $60.3 million for the nine months ended October 31, 2018 and 2019. Intangible Assets, Net Intangible assets, net consist of the following (in thousands): As of January 31, 2019 As of October 31, 2019 Gross Carrying Value Accumulated Amortization Net Carrying Amount Gross Carrying Value Accumulated Amortization Net Carrying Amount Technology patents $ 10,125 $ (6,572) $ 3,553 $ 19,125 $ (8,235) $ 10,890 Developed technology 17,700 (1,135) 16,565 56,100 (5,962) 50,138 Intangible assets, net $ 27,825 $ (7,707) $ 20,118 $ 75,225 $ (14,197) $ 61,028 Intangible assets amortization expense was $0.9 million and $2.6 million for the three months ended October 31, 2018 and 2019, and $1.6 million and $6.5 million for the nine months ended October 31, 2018 and 2019. As of October 31, 2019, the weighted-average remaining amortization period was 4.0 years for technology patents and 6.2 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. As of October 31, 2019, future expected amortization expense for intangible assets is as follows (in thousands): Fiscal Years Ending January 31, Estimated Remainder of 2020 $ 2,771 2021 10,804 2022 9,846 2023 9,300 2024 9,300 Thereafter 19,007 Total $ 61,028 Goodwill The change in the carrying amount of goodwill is as follows (in thousands): Amount Balance as of January 31, 2019 $ 10,997 Goodwill acquired 25,423 Balance as of October 31, 2019 $ 36,420 Accrued Expenses and Other Liabilities Accrued expenses and other liabilities consist of the following (in thousands): As of January 31, 2019 As of October 31, 2019 Taxes payable $ 7,146 $ 10,579 Accrued marketing 6,173 10,159 Accrued travel and entertainment expenses 3,570 3,054 Acquisition consideration held back 3,725 — Other accrued liabilities 19,246 24,431 Total accrued expenses and other liabilities $ 39,860 $ 48,223

Convertible Senior Notes

Convertible Senior Notes	9 Months Ended
	Oct. 31, 2019
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 Class A common stock per $1,000 principal amount, which is equal to an initial conversion price of approximately $26.27 per share of Class A 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 Class A 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 Class A 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 Class A common stock, or a combination of cash and shares of our Class A 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 Class A 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. In accounting for the issuance of the Notes, we separated the Notes into liability and equity components. The carrying amount of the liability component was determined by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was calculated by deducting the fair value of the liability component from the principal amount of the Notes as a whole. The difference between the principal amount of the Notes and the liability component (the debt discount) is amortized to interest expense in the condensed consolidated statements of operations using the effective interest method over the term of the Notes. The equity component of the Notes is included in additional paid-in capital in the condensed consolidated balance sheets and is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the transaction costs related to the issuance of the Notes, we allocated the total amount incurred to the liability and equity components using the same proportions as the initial carrying value of the Notes. Transaction costs attributable to the liability component were netted with the principal amount of the Notes in the condensed consolidated balance sheets and are being amortized to interest expense in the condensed consolidated statements of operations using the effective interest method over the term of the Notes. Transaction costs attributable to the equity component were netted with the equity component of the Notes in additional paid-in capital in the condensed consolidated balance sheets. 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): As of October 31, 2019 Liability: Principal $ 575,000 Less: debt discount, net of amortization (97,898) Less: debt issuance costs, net of amortization (7,088) Net carrying amount of the Notes $ 470,014 Stockholders' equity: 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 as of October 31, 2019 was $602.8 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 Class A common stock of $19.46 on October 31, 2019, the if-converted value of the Notes of $425.9 million was less than its principal amount. The following table sets forth total interest expense recognized related to the Notes for three and nine months ended October 31, 2018 and 2019 (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Amortization of debt discount $ 6,084 $ 6,431 $ 13,441 $ 18,824 Amortization of debt issuance costs 441 465 973 1,362 Total amortization of debt discount and debt issuance costs 6,525 6,896 14,414 20,186 Contractual interest expense 181 181 405 539 Total interest expense related to the Notes $ 6,706 $ 7,077 $ 14,819 $ 20,725 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 Class A 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 Class A 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

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Oct. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases As of October 31, 2019, we have various non-cancelable operating lease commitments for office facilities which as a result of the adoption of ASC 842, have been recorded as operating lease liabilities on our condensed consolidated balance sheet. Refer to Note 8—Leases for additional information regarding lease commitments. Convertible Notes The repayment of our Notes with an aggregate principal amount of $575.0 million is due on April 15, 2023. Refer to Note 6 for further information regarding our Notes. Letters of Credit In connection with a lease executed in January 2019, we issued a letter of credit of $0.5 million. As of January 31, 2019 and October 31, 2019, we had outstanding letters of credit in the aggregate amount of $10.8 million and $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 as of October 31, 2019. 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	9 Months Ended
	Oct. 31, 2019
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 three months ended October 31, 2019, we amended an existing office facility lease to extend the lease term and add additional office space resulting in additional lease payments of $19.4 million. The components of lease costs were as follows (in thousands): Three Months Ended Nine Months Ended October 31, 2019 October 31, 2019 Fixed operating lease cost $ 8,509 $ 25,220 Variable lease cost (1) 2,122 6,464 Short-term lease cost (12 months or less) 1,412 3,757 Total lease cost $ 12,043 $ 35,441 —————————— (1) Variable lease cost for the three and nine months ended October 31, 2019 predominantly includes common area maintenance charges. Future lease payments under our non-cancelable operating leases as of October 31, 2019 were as follows (in thousands): Fiscal Years Ending January 31, Operating Leases The remainder of 2020 $ 8,359 2021 34,411 2022 28,489 2023 23,507 2024 17,782 Thereafter 42,051 Total future lease payments 154,599 Less: imputed interest (28,002) Present value of lease liabilities $ 126,597 Future lease payments in the above table do not include a facility operating lease that has not commenced with undiscounted cash flows of $7.9 million. This lease will commence in fiscal year 2021 with a lease term of 12.4 years. Supplemental cash flow information related to our operating leases for the nine months ended October 31, 2019 as well as the weighted-average remaining lease term and weighted-average discount rate as of October 31, 2019 were as follows: Cash paid for amounts included in the measurement of lease liabilities (in thousands) $ 24,403 Operating lease right-of-use assets obtained in exchange for operating lease liabilities $ 14,937 Weighted-average remaining lease term (years) 5.71 Weighted-average discount rate 6.52 % As previously disclosed in our Annual Report on Form 10-K for the year ended January 31, 2019 and under the previous lease accounting standard, ASC 840, Leases , the following table summarizes the future minimum lease payments due under operating leases as of January 31, 2019 (in thousands): Year Ending January 31, Operating Leases 2020 $ 31,297 2021 28,573 2022 24,381 2023 20,440 2024 14,780 Thereafter 30,096 Total $ 149,567

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Oct. 31, 2019
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. As of October 31, 2019, 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 and Class B common stock. As of October 31, 2019, 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. As of October 31, 2019, 259,920,406 shares of Class A common stock were issued and outstanding. Common Stock Repurchase Program In August 2019, our board of directors approved the repurchase of up to $150.0 million of our Class A common stock. The authorization allows us to repurchase shares of our Class A common stock opportunistically and will be funded from available working capital. Repurchases may be made at management’s discretion from time to time on the open market through privately negotiated transactions, transactions structured through investment banking institutions, block purchase techniques, 10b5-1 trading plans, or a combination of the foregoing. The repurchase program does not obligate us to acquire any of our common stock, has no end date, and may be suspended or discontinued by us at any time without prior notice. During the three months ended October 31, 2019, there were no repurchases of common stock. Repurchase of Common Stock in connection with the Notes Concurrent with the issuance of the Notes (see Note 6), we repurchased and retired 1,008,573 shares, or $20.0 million, of our Class A common stock at $19.83 per share, which was equal to the closing price per share of our Class A common stock on April 4, 2018, the date of the pricing of the offering of the Notes. The repurchased shares were recorded as a reduction of additional paid-in capital on the condensed consolidated balance sheet.

Equity Incentive Plans

Equity Incentive Plans	9 Months Ended
	Oct. 31, 2019
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 became effective in connection with our initial public offering (IPO) in October 2015 and serves as the successor to our 2009 Plan. The 2015 Plan 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. No new awards have been issued under our 2009 Plan after the effective date of our 2015 Plan. Outstanding awards granted under our 2009 Plan will remain subject to the terms of our 2009 Plan and applicable award agreements, until such outstanding awards that are stock options are exercised, terminated or expired by their terms. Starting in December 2018, 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. The exercise price of stock options will generally not be less than 100% of the fair market value of our common stock on the date of grant, as determined by our board of directors. Our equity awards generally vest over a two four 2015 Employee Stock Purchase Plan Our 2015 Employee Stock Purchase Plan (2015 ESPP) became effective in connection with our IPO. The 2015 ESPP allows eligible employees to purchase shares of our Class A 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 or $25,000 in any calendar year (as determined under applicable tax rules). In February 2019, we amended the ESPP on a prospective basis, to include an additional dollar cap of $7,500 per purchase period. The 2015 ESPP provides for a 24-month offering period beginning March 16th and September 16th of each year, and each offering period consists of four 6 months purchase periods, subject to a reset provision. 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. On each purchase date, eligible employees will purchase our Class A common stock at a price per share equal to 85% of the lesser of the fair market value of our Class A common stock (1) on the first trading day of the applicable offering period or (2) the purchase date. During the three months ended October 31, 2019, t here was an ESPP reset that resulted in a modification charge of $11.4 million, which is recognized over the new offering period ending September 15, 2021. We recognized stock-based compensation expense related to our 2015 ESPP of $11.6 million and $4.3 million during the three months ended October 31, 2018 and 2019 and $26.2 million and $20.0 million during the nine months ended October 31, 2018 and 2019. As of October 31, 2019, total unrecognized stock-based compensation cost related to 2015 ESPP was $33.1 million, which is expected to be recognized over a weighted-average period of 1.9 years. Stock Options A summary of stock option activity under our equity incentive plans and related information is as follows: Options Outstanding Number of Weighted- Weighted- Aggregate Balance as of January 31, 2019 35,465,543 $ 8.34 5.4 $ 339,591 Options exercised (4,797,359) 5.42 Options forfeited/canceled (468,544) 15.78 Balance as of October 31, 2019 30,199,640 $ 8.69 3.9 $ 325,184 Vested and exercisable as of October 31, 2019 25,550,655 $ 7.71 4.6 $ 300,257 The aggregate intrinsic value of options vested and exercisable as of October 31, 2019 is calculated based on the difference between the exercise price and the closing price of $19.46 of our Class A common stock on October 31, 2019. As of October 31, 2019, total unrecognized employee compensation cost related to outstanding options was $15.0 million, which is expected to be recognized over a weighted-average period of 1.5 years. RSUs A summary of the RSU activity under our 2015 Plan and related information is as follows: Number of RSUs Outstanding Weighted- Aggregate Unvested balance as of January 31, 2019 21,917,550 $ 17.94 $ 392,515 Granted 10,889,807 19.35 Vested (6,910,339) 17.21 Forfeited (2,239,739) 18.76 Unvested balance as of October 31, 2019 23,657,279 $ 18.72 $ 460,371 During the three months ended October 31, 2018 and 2019, we recognized $31.2 million and $41.0 million in stock-based compensation expense relating to RSUs. During the nine months ended October 31, 2018 and 2019, we recognized $87.1 million and $118.7 million in stock-based compensation expense relating to RSUs. As of October 31, 2019, total unrecognized employee compensation cost related to unvested RSUs was $405.8 million, which is expected to be recognized over a weighted-average period of 2.9 years. Restricted Stock In January 2019, we issued 183,902 shares of performance restricted stock, at a target percentage of 100%, with both performance and service vesting conditions payable in common shares, from 0% to 160%, of the target number granted, contingent upon the degree to which the performance condition is met. The grant date for these shares was subsequently established when the performance condition was determined in March 2019. Any portion of shares that are not earned will be canceled. During the nine months ended October 31, 2019, we issued 1,291,194 shares of performance restricted stock, at a target percentage of 100%, with both performance and service vesting conditions payable in common shares, from 0% to 160%, 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. During the nine months ended October 31, 2019, we also issued 108,494 shares of additional restricted stock earned based on the actual attainment of previously issued performance restricted stock awards. A summary of the restricted stock activity under our 2015 Plan and related information is as follows: Number of Restricted Stock Outstanding Weighted- Aggregate Unvested balance as of January 31, 2019 2,267,569 $ 18.70 $ 40,612 Granted 1,399,688 20.30 Vested (1,063,977) 19.32 Unvested balance as of October 31, 2019 2,603,280 $ 19.42 $ 50,660 All unvested restricted shares are subject to cancellation to the extent vesting conditions are not met. During the three months ended October 31, 2018 and 2019, we recognized $7.5 million and $4.4 million in stock-based compensation expense relating to restricted stock. During the nine months ended October 31, 2018 and 2019, we recognized $17.7 million and $19.2 million in stock-based compensation expense relating to restricted stock. As of October 31, 2019, total unrecognized employee compensation cost related to unvested restricted stock was $21.5 million, which is expected to be recognized over a weighted-average period of 2.1 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): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Cost of revenue—product $ 862 $ 912 $ 2,190 $ 2,843 Cost of revenue—support subscription 3,327 3,517 8,940 11,101 Research and development (1) 24,634 27,827 67,956 85,180 Sales and marketing 18,681 16,802 49,890 51,171 General and administrative 10,825 5,171 26,962 24,495 Total stock-based compensation expense $ 58,329 $ 54,229 $ 155,938 $ 174,790 ____________________________________ (1) Included in the three and nine months ended October 31, 2019 were $1.9 million and $4.2 million in deferred payments related to the Compuverde acquisition. See Note 4 for further details. 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	9 Months Ended
	Oct. 31, 2019
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, repurchasable shares from early exercised stock options and 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): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Net loss $ (28,180) $ (29,982) $ (152,607) $ (196,336) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 235,205 255,047 229,505 250,618 Net loss per share attributable to common stockholders, basic and diluted $ (0.12) $ (0.12) $ (0.66) $ (0.78) 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): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Stock options to purchase common stock 37,814 30,769 41,201 32,150 Unvested RSUs 19,493 24,251 19,488 24,544 Restricted stock and early exercised stock options subject to repurchase 3,277 2,732 2,938 2,762 Shares related to Notes 21,884 21,884 16,513 21,884 Shares issuable pursuant to ESPP 236 571 80 571 Total 82,704 80,207 80,220 81,911

Other Income (Expense), Net

Other Income (Expense), Net	9 Months Ended
	Oct. 31, 2019
Other Income and Expenses [Abstract]
Other Income (Expense), Net	Other Income (Expense), Net Other income (expense), net consists of the following (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Interest income (1) $ 5,497 $ 6,770 $ 12,151 $ 20,376 Interest expense (2) (6,706) (7,077) (14,819) (20,725) Foreign currency transactions gains (losses) (1,667) 97 (6,074) (2,329) Other income (expense) (13) 219 822 219 Total other income (expense), net $ (2,889) $ 9 $ (7,920) $ (2,459) ____________________________________ (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 and the contractual interest expense related to the Notes.

Income Taxes

Income Taxes	9 Months Ended
	Oct. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our income tax provision was primarily due to 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, non-deductible stock-based compensation expense and the tax rate differential between the U.S. and foreign countries. As of October 31, 2019, there were no material changes to either the nature or the amounts of the uncertain tax positions previously determined for the year ended January 31, 2019.

Segment Information

Segment Information	9 Months Ended
	Oct. 31, 2019
Segment Reporting [Abstract]
Segment Information	Segment Information Our chief operating decision maker is a group comprised of our Chief Executive Officer, our Chief Financial Officer, and our Chief Operating Officer. This group 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): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 United States $ 263,488 $ 312,010 $ 678,166 $ 835,545 Rest of the world 109,291 116,399 259,442 315,891 Total revenue $ 372,779 $ 428,409 $ 937,608 $ 1,151,436 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): As of January 31, 2019 As of October 31, 2019 United States $ 120,876 $ 119,920 Rest of the world 4,477 10,316 Total long-lived assets $ 125,353 $ 130,236

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies - (Policies)	9 Months Ended
	Oct. 31, 2019
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation 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 the year ended January 31, 2019. 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 2020 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. 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, property and equipment, the period of benefit for deferred contract costs for commissions, stock-based compensation, provision for income taxes including related reserves, valuation of intangible assets and goodwill, the incremental borrowing rate we use to determine our operating lease liabilities. 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 to assess whether those with unrealized loss positions are other than temporarily impaired. We consider impairments to be other than temporary if they are related to deterioration in credit risk or if it is likely we will sell the securities before the recovery of their cost basis. Realized gains and losses from the sale of marketable securities and declines in value deemed to be other than temporary are determined on the specific identification method. To date, there have been no declines in value deemed to be other than temporary in any of our securities. 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.
Deferred Commissions	Deferred CommissionsDeferred 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 support subscription revenue are amortized over an expected useful life of six
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.
Deferred Revenue and Revenue Recognition	Deferred Revenue Deferred revenue primarily consists of amounts that have been invoiced but that have not yet been recognized as revenue and performance obligations pertaining to support 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. Revenue Recognition We derive revenue from two sources: (1) product revenue which includes hardware and embedded software and (2) support subscription revenue which includes customer support, hardware maintenance, and software upgrades on a when-and-if-available basis. Support subscription revenue also includes our Pure as-a-Servic e offerings, including the offering formerly known as Evergreen Storage Service (ES2). Our product revenue is derived from the sale of storage hardware and operating system software that is integrated into the hardware. We typically recognize product revenue upon transfer of control to our customers. Products are typically shipped directly by us to customers, and our channel partners do not stock our inventory. Our support subscription revenue is derived from the sale of support subscription, which includes the right to receive unspecified software upgrades and enhancements on a when-and-if-available basis, bug fixes, parts replacement services related to the hardware, as well as access to our cloud-based management and support platform. Support subscription revenue is also derived from the sale of our Pure as-a-Service offerings. Revenue related to support revenue is recognized ratably over the contractual term, which generally ranges from one to six years and represents our performance obligations period. The vast majority of our products are sold with support subscription agreements, which typically commence upon transfer of control of the corresponding products to our customers. Costs to service the support subscription are expensed as incurred. In addition, our Evergreen Storage program provides our customers who continually maintain active support subscription agreements for three years with an included controller refresh with each additional three year support subscription renewal. In accordance with revenue recognition guidance, the controller refresh represents an additional performance obligation and the allocated revenue is recognized in the period in which these controllers are shipped. 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
Recently Adopted Accounting Pronouncements and Recent Accounting Pronouncements Not Yet Adopted	Recently Adopted Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2016-02, Leases (ASC 842) and subsequent amendments to the initial guidance (collectively, Topic 842). ASC 842 requires lessees to generally recognize on its balance sheet operating and financing lease liabilities and corresponding ROU assets at the commencement date, and to recognize the associated lease expenses in the condensed consolidated statement of operations in a manner similar to that required under historical accounting rules. On February 1, 2019, we adopted ASC 842 using the modified retrospective approach by electing to use the optional transition method which allows us to continue to apply the guidance of ASC 840, including disclosure requirements, in the comparative periods presented. We elected the package of transition expedients, which allowed us to carry forward our historical lease classifications, our assessment of whether any existing leases as of the date of adoption are or contain leases, and our assessment of indirect costs for any leases that existed prior to adoption of the new standard. We elected to take the practical expedient to keep leases with an initial term of 12 months or less off the condensed consolidated balance sheet and recognize the associated lease payments in the consolidated statements of operations on a straight-line basis over the lease term. We recognized operating ROU assets of $124.5 million and lease liabilities of $130.6 million on our condensed consolidated balance sheet as of February 1, 2019, which included reclassifying prepaid rent and deferred rent as a component of the ROU asset. Topic 842 did not have a material impact on our condensed consolidated statements of operations and cash flows. Refer to Note 8 for additional disclosures. In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This standard allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017 and requires certain disclosures about stranded tax effects. We adopted this standard on February 1, 2019 and the adoption had no impact on our condensed consolidated financial statements. Recent Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13). ASU 2016-13 amends guidance on reporting credit losses for assets held at amortized cost basis and available-for-sale debt securities to require that credit losses on available-for-sale debt securities be presented as an allowance rather than as a write-down. The measurement of credit losses for newly recognized financial assets and subsequent changes in the allowance for credit losses are recorded in the statements of operations. The amendments in this update will be effective for us beginning on February 3, 2020. We do not believe the adoption of this standard will have a material impact to our condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820), Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement (ASU 2018-13) which amended its conceptual framework to improve the effectiveness of disclosures in notes to financial statements. ASU 2018-13 eliminates such disclosures around the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy. The guidance also adds new disclosure requirements for Level 3 measurements. ASU 2018-13 is effective for us beginning February 3, 2020. We do not believe this standard will have a material impact on our condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (ASU 2018-15). ASC 2018-15 aligns the requirements for capitalizing implementation costs in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This standard will be effective for us beginning February 3, 2020 and will be applied either retrospectively or prospectively. We plan to adopt this new accounting standard prospectively, and we do not expect the adoption will have a material impact 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. 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.

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies - (Tables)	9 Months Ended
	Oct. 31, 2019
Accounting Policies [Abstract]
Deferred Commissions	Changes in total deferred commissions during the periods presented are as follows (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Beginning balance (1) $ 91,469 $ 118,568 $ 87,313 $ 114,973 Additions 31,884 34,071 71,887 82,381 Recognition of deferred commissions (26,913) (29,508) (62,760) (74,223) Ending balance $ 96,440 $ 123,131 $ 96,440 $ 123,131 ____________________________________ (1) Balance as of January 31, 2018 was adjusted to reflect the adoption of ASC 606.
Deferred Revenue	Changes in total deferred revenue during the periods presented are as follows (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Beginning balance (1) $ 413,247 $ 607,263 $ 374,102 $ 535,920 Additions 122,681 142,164 290,463 400,605 Recognition of deferred revenue (74,740) (106,229) (203,377) (293,327) Ending balance $ 461,188 $ 643,198 $ 461,188 $ 643,198 ____________________________________ (1) Balance as of January 31, 2018 was adjusted to reflect the adoption of ASC 606.

Financial Instruments - (Tables

Financial Instruments - (Tables)	9 Months Ended
	Oct. 31, 2019
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 as of January 31, 2019 and October 31, 2019 (in thousands): As of January 31, 2019 Amortized Gross Unrealized Gross Unrealized Fair Cash Equivalents Marketable Securities Restricted Cash Level 1 Money market accounts $ — $ — $ — $ 43,038 $ 27,215 $ — $ 15,823 Level 2 U.S. government treasury notes 315,329 208 (315) 315,222 34,129 281,093 — U.S. government agencies 69,114 17 (154) 68,977 9,983 58,994 — Corporate debt securities 363,860 534 (757) 363,637 — 363,637 — Foreign government bonds 7,965 36 — 8,001 — 8,001 — Asset-backed securities 37,664 105 (12) 37,757 — 37,757 — Total $ 793,932 $ 900 $ (1,238) $ 836,632 $ 71,327 $ 749,482 $ 15,823 As of October 31, 2019 Amortized Gross Unrealized Gross Unrealized Fair Cash Equivalents Marketable Restricted Cash Level 1 Money market accounts $ — $ — $ — $ 20,372 $ 5,085 $ — $ 15,287 Level 2 U.S. government treasury notes 350,325 2,165 (30) 352,460 — 352,460 — U.S. government agencies 42,120 331 (1) 42,450 — 42,450 — Corporate debt securities 436,842 3,800 (10) 440,632 2,361 438,271 — Foreign government bonds 14,988 131 (5) 15,114 — 15,114 — Asset-backed securities 88,222 466 (14) 88,674 — 88,674 — Total $ 932,497 $ 6,893 $ (60) $ 959,702 $ 7,446 $ 936,969 $ 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): As of October 31, 2019 Amortized Cost Fair Value Due within one year $ 427,200 $ 429,154 Due in one to five years 502,936 507,815 Total $ 930,136 $ 936,969
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 as of October 31, 2019, aggregated by investment category (in thousands): Less than 12 months Greater than 12 months Total Fair Unrealized Fair Unrealized Fair Unrealized U.S. government treasury notes $ 23,968 $ (27) $ 3,623 $ (3) $ 27,591 $ (30) U.S. government agencies — — 1,938 (1) 1,938 (1) Corporate debt securities 11,532 (7) 10,366 (3) 21,898 (10) Foreign government bonds 2,964 (5) — — 2,964 (5) Asset-backed securities 16,130 (14) — — 16,130 (14) Total $ 54,594 $ (53) $ 15,927 $ (7) $ 70,521 $ (60)

Balance Sheet Components - (Tab

Balance Sheet Components - (Tables)	9 Months Ended
	Oct. 31, 2019
Balance Sheet Components Disclosure [Abstract]
Inventory	Inventory consists of the following (in thousands): As of January 31, 2019 As of October 31, 2019 Raw materials $ 3,349 $ 3,163 Finished goods 41,338 36,688 Inventory $ 44,687 $ 39,851
Property and Equipment, Net	Property and equipment, net consists of the following (in thousands): As of January 31, 2019 As of October 31, 2019 Test equipment $ 170,930 $ 199,878 Computer equipment and software 117,330 139,188 Furniture and fixtures 6,980 8,483 Leasehold improvements 34,286 40,235 Total property and equipment 329,526 387,784 Less: accumulated depreciation and amortization (204,173) (257,548) Property and equipment, net $ 125,353 $ 130,236
Intangible Assets, Net	Intangible assets, net consist of the following (in thousands): As of January 31, 2019 As of October 31, 2019 Gross Carrying Value Accumulated Amortization Net Carrying Amount Gross Carrying Value Accumulated Amortization Net Carrying Amount Technology patents $ 10,125 $ (6,572) $ 3,553 $ 19,125 $ (8,235) $ 10,890 Developed technology 17,700 (1,135) 16,565 56,100 (5,962) 50,138 Intangible assets, net $ 27,825 $ (7,707) $ 20,118 $ 75,225 $ (14,197) $ 61,028
Expected Amortization Expenses for Intangible Assets	As of October 31, 2019, future expected amortization expense for intangible assets is as follows (in thousands): Fiscal Years Ending January 31, Estimated Remainder of 2020 $ 2,771 2021 10,804 2022 9,846 2023 9,300 2024 9,300 Thereafter 19,007 Total $ 61,028
Goodwill	The change in the carrying amount of goodwill is as follows (in thousands): Amount Balance as of January 31, 2019 $ 10,997 Goodwill acquired 25,423 Balance as of October 31, 2019 $ 36,420
Accrued Expenses and Other Liabilities	Accrued expenses and other liabilities consist of the following (in thousands): As of January 31, 2019 As of October 31, 2019 Taxes payable $ 7,146 $ 10,579 Accrued marketing 6,173 10,159 Accrued travel and entertainment expenses 3,570 3,054 Acquisition consideration held back 3,725 — Other accrued liabilities 19,246 24,431 Total accrued expenses and other liabilities $ 39,860 $ 48,223

Convertible Senior Notes - (Tab

Convertible Senior Notes - (Tables)	9 Months Ended
	Oct. 31, 2019
Debt Disclosure [Abstract]
Convertible Debt	The Notes consisted of the following (in thousands): As of October 31, 2019 Liability: Principal $ 575,000 Less: debt discount, net of amortization (97,898) Less: debt issuance costs, net of amortization (7,088) Net carrying amount of the Notes $ 470,014 Stockholders' equity: 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 three and nine months ended October 31, 2018 and 2019 (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Amortization of debt discount $ 6,084 $ 6,431 $ 13,441 $ 18,824 Amortization of debt issuance costs 441 465 973 1,362 Total amortization of debt discount and debt issuance costs 6,525 6,896 14,414 20,186 Contractual interest expense 181 181 405 539 Total interest expense related to the Notes $ 6,706 $ 7,077 $ 14,819 $ 20,725 Effective interest rate of the liability component 5.6 % 5.6 % 5.6 % 5.6 %

Leases - (Tables)

Leases - (Tables)	9 Months Ended
	Oct. 31, 2019
Leases [Abstract]
Lease costs	The components of lease costs were as follows (in thousands): Three Months Ended Nine Months Ended October 31, 2019 October 31, 2019 Fixed operating lease cost $ 8,509 $ 25,220 Variable lease cost (1) 2,122 6,464 Short-term lease cost (12 months or less) 1,412 3,757 Total lease cost $ 12,043 $ 35,441 —————————— (1) Variable lease cost for the three and nine months ended October 31, 2019 predominantly includes common area maintenance charges.
Future minimum lease payments	Future lease payments under our non-cancelable operating leases as of October 31, 2019 were as follows (in thousands): Fiscal Years Ending January 31, Operating Leases The remainder of 2020 $ 8,359 2021 34,411 2022 28,489 2023 23,507 2024 17,782 Thereafter 42,051 Total future lease payments 154,599 Less: imputed interest (28,002) Present value of lease liabilities $ 126,597
Components Of Lease Cost	Supplemental cash flow information related to our operating leases for the nine months ended October 31, 2019 as well as the weighted-average remaining lease term and weighted-average discount rate as of October 31, 2019 were as follows: Cash paid for amounts included in the measurement of lease liabilities (in thousands) $ 24,403 Operating lease right-of-use assets obtained in exchange for operating lease liabilities $ 14,937 Weighted-average remaining lease term (years) 5.71 Weighted-average discount rate 6.52 %
Schedule of future minimum rental payments for operating leases	As previously disclosed in our Annual Report on Form 10-K for the year ended January 31, 2019 and under the previous lease accounting standard, ASC 840, Leases , the following table summarizes the future minimum lease payments due under operating leases as of January 31, 2019 (in thousands): Year Ending January 31, Operating Leases 2020 $ 31,297 2021 28,573 2022 24,381 2023 20,440 2024 14,780 Thereafter 30,096 Total $ 149,567

Equity Incentive Plans - (Table

Equity Incentive Plans - (Tables)	9 Months Ended
	Oct. 31, 2019
Share-based Payment Arrangement [Abstract]
Equity Incentive Plans	A summary of stock option activity under our equity incentive plans and related information is as follows: Options Outstanding Number of Weighted- Weighted- Aggregate Balance as of January 31, 2019 35,465,543 $ 8.34 5.4 $ 339,591 Options exercised (4,797,359) 5.42 Options forfeited/canceled (468,544) 15.78 Balance as of October 31, 2019 30,199,640 $ 8.69 3.9 $ 325,184 Vested and exercisable as of October 31, 2019 25,550,655 $ 7.71 4.6 $ 300,257
Restricted Stock Units	A summary of the RSU activity under our 2015 Plan and related information is as follows: Number of RSUs Outstanding Weighted- Aggregate Unvested balance as of January 31, 2019 21,917,550 $ 17.94 $ 392,515 Granted 10,889,807 19.35 Vested (6,910,339) 17.21 Forfeited (2,239,739) 18.76 Unvested balance as of October 31, 2019 23,657,279 $ 18.72 $ 460,371
Restricted Stock	A summary of the restricted stock activity under our 2015 Plan and related information is as follows: Number of Restricted Stock Outstanding Weighted- Aggregate Unvested balance as of January 31, 2019 2,267,569 $ 18.70 $ 40,612 Granted 1,399,688 20.30 Vested (1,063,977) 19.32 Unvested balance as of October 31, 2019 2,603,280 $ 19.42 $ 50,660
Stock-Based Compensation	The following table summarizes the components of stock-based compensation expense recognized in the condensed consolidated statements of operations (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Cost of revenue—product $ 862 $ 912 $ 2,190 $ 2,843 Cost of revenue—support subscription 3,327 3,517 8,940 11,101 Research and development (1) 24,634 27,827 67,956 85,180 Sales and marketing 18,681 16,802 49,890 51,171 General and administrative 10,825 5,171 26,962 24,495 Total stock-based compensation expense $ 58,329 $ 54,229 $ 155,938 $ 174,790 ____________________________________ (1) Included in the three and nine months ended October 31, 2019 were $1.9 million and $4.2 million in deferred payments related to the Compuverde acquisition. See Note 4 for further details.

Net Loss per Share Attributab_2

Net Loss per Share Attributable to Common Stockholders - (Tables)	9 Months Ended
	Oct. 31, 2019
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): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Net loss $ (28,180) $ (29,982) $ (152,607) $ (196,336) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 235,205 255,047 229,505 250,618 Net loss per share attributable to common stockholders, basic and diluted $ (0.12) $ (0.12) $ (0.66) $ (0.78)
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): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Stock options to purchase common stock 37,814 30,769 41,201 32,150 Unvested RSUs 19,493 24,251 19,488 24,544 Restricted stock and early exercised stock options subject to repurchase 3,277 2,732 2,938 2,762 Shares related to Notes 21,884 21,884 16,513 21,884 Shares issuable pursuant to ESPP 236 571 80 571 Total 82,704 80,207 80,220 81,911

Other Income (Expense), Net - (

Other Income (Expense), Net - (Tables)	9 Months Ended
	Oct. 31, 2019
Other Income and Expenses [Abstract]
Summary of Other Income (Expense)	Other income (expense), net consists of the following (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 Interest income (1) $ 5,497 $ 6,770 $ 12,151 $ 20,376 Interest expense (2) (6,706) (7,077) (14,819) (20,725) Foreign currency transactions gains (losses) (1,667) 97 (6,074) (2,329) Other income (expense) (13) 219 822 219 Total other income (expense), net $ (2,889) $ 9 $ (7,920) $ (2,459) ____________________________________ (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 and the contractual interest expense related to the Notes.

Segment Information - (Tables)

Segment Information - (Tables)	9 Months Ended
	Oct. 31, 2019
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): Three Months Ended October 31, Nine Months Ended October 31, 2018 2019 2018 2019 United States $ 263,488 $ 312,010 $ 678,166 $ 835,545 Rest of the world 109,291 116,399 259,442 315,891 Total revenue $ 372,779 $ 428,409 $ 937,608 $ 1,151,436
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): As of January 31, 2019 As of October 31, 2019 United States $ 120,876 $ 119,920 Rest of the world 4,477 10,316 Total long-lived assets $ 125,353 $ 130,236

Basis of Presentation and Sum_4

Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Jul. 31, 2019	Feb. 01, 2019	Jan. 31, 2019	Jul. 31, 2018	Jan. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash	$ 15,287,000		$ 15,287,000				$ 15,823,000
Deferred commissions	123,131,000	$ 96,440,000	123,131,000	$ 96,440,000	$ 118,568,000		$ 114,973,000	$ 91,469,000	$ 87,313,000
Impairment	0	0	0	0
Operating lease right-of-use assets	119,403,000		119,403,000
Operating lease liabilities	$ 126,597,000		$ 126,597,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-11-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue expected to be recognized (as a percent)	41.00%		41.00%
Revenue expected to be recognized term (in months)	12 months		12 months
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets						$ 124,500,000
Operating lease liabilities						$ 130,600,000
Product Revenue and Support Subscription Revenue
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenue recognized	$ 101,400,000	$ 67,000,000	$ 213,200,000	$ 151,400,000

Basis of Presentation and Sum_5

Basis of Presentation and Summary of Significant Accounting Policies - Deferred Commissions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Accounting Policies [Abstract]
Remaining amortization period	6 years		6 years
Contract Assets
Beginning balance	$ 118,568	$ 91,469	$ 114,973	$ 87,313
Additions	34,071	31,884	82,381	71,887
Recognition of deferred commissions	(29,508)	(26,913)	(74,223)	(62,760)
Ending balance	$ 123,131	$ 96,440	$ 123,131	$ 96,440

Basis of Presentation and Sum_6

Basis of Presentation and Summary of Significant Accounting Policies - Deferred Commissions (Typed Dimensions) (Details)	Oct. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-11-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation (as a percent)	26.00%

Basis of Presentation and Sum_7

Basis of Presentation and Summary of Significant Accounting Policies - Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Contract Liability
Beginning balance	$ 607,263	$ 413,247	$ 535,920	$ 374,102
Additions	142,164	122,681	400,605	290,463
Recognition of deferred revenue	(106,229)	(74,740)	(293,327)	(203,377)
Ending balance	643,198	461,188	643,198	461,188
Product Revenue and Support Subscription Revenue
Contract Liability
Ending balance	810,800		810,800
Deferred revenue recognized	$ 101,400	$ 67,000	$ 213,200	$ 151,400

Financial Instruments - Cash Eq

Financial Instruments - Cash Equivalents, Marketable Securities and Restricted Cash (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Total	$ 930,136
Fair Value	936,969
Cash Equivalents	7,446	$ 71,327
Marketable securities	936,969	749,482
Restricted Cash	15,287	15,823
Amortized Cost	932,497	793,932
Total gross unrealized gains	6,893	900
Total gross unrealized losses	(60)	(1,238)
Total fair value	959,702	836,632
Level 1 | Money market accounts
Debt Securities, Available-for-sale [Line Items]
Fair Value	20,372	43,038
Cash Equivalents	5,085	27,215
Marketable securities	0	0
Restricted Cash	15,287	15,823
Level 2 | U.S. government treasury notes
Debt Securities, Available-for-sale [Line Items]
Total	350,325	315,329
Gross Unrealized Gains	2,165	208
Gross Unrealized Losses	(30)	(315)
Fair Value	352,460	315,222
Cash Equivalents	0	34,129
Marketable securities	352,460	281,093
Restricted Cash	0	0
Level 2 | U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Total	42,120	69,114
Gross Unrealized Gains	331	17
Gross Unrealized Losses	(1)	(154)
Fair Value	42,450	68,977
Cash Equivalents	0	9,983
Marketable securities	42,450	58,994
Restricted Cash	0	0
Level 2 | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total	436,842	363,860
Gross Unrealized Gains	3,800	534
Gross Unrealized Losses	(10)	(757)
Fair Value	440,632	363,637
Cash Equivalents	2,361	0
Marketable securities	438,271	363,637
Restricted Cash	0	0
Level 2 | Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Total	14,988	7,965
Gross Unrealized Gains	131	36
Gross Unrealized Losses	(5)	0
Fair Value	15,114	8,001
Cash Equivalents	0	0
Marketable securities	15,114	8,001
Restricted Cash	0	0
Level 2 | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total	88,222	37,664
Gross Unrealized Gains	466	105
Gross Unrealized Losses	(14)	(12)
Fair Value	88,674	37,757
Cash Equivalents	0	0
Marketable securities	88,674	37,757
Restricted Cash	$ 0	$ 0

Financial Instruments - Amortiz

Financial Instruments - Amortized Cost and Estimated Fair Value (Details) $ in Thousands	Oct. 31, 2019USD ($)
Amortized Cost
Due within one year	$ 427,200
Due in one to five years	502,936
Total	930,136
Fair Value
Due within one year	429,154
Due in one to five years	507,815
Total	$ 936,969

Financial Instruments - Gross U

Financial Instruments - Gross Unrealized Losses and Fair Values (Details) $ in Thousands	Oct. 31, 2019USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less than 12 months	$ 54,594
Unrealized Loss, Less than 12 Months	(53)
Fair Value, Greater than 12 months	15,927
Unrealized Loss, Greater than 12 months	(7)
Fair Value, Total	70,521
Unrealized Loss, Total	(60)
U.S. government treasury notes
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less than 12 months	23,968
Unrealized Loss, Less than 12 Months	(27)
Fair Value, Greater than 12 months	3,623
Unrealized Loss, Greater than 12 months	(3)
Fair Value, Total	27,591
Unrealized Loss, Total	(30)
U.S. government agencies
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	1,938
Unrealized Loss, Greater than 12 months	(1)
Fair Value, Total	1,938
Unrealized Loss, Total	(1)
Corporate debt securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less than 12 months	11,532
Unrealized Loss, Less than 12 Months	(7)
Fair Value, Greater than 12 months	10,366
Unrealized Loss, Greater than 12 months	(3)
Fair Value, Total	21,898
Unrealized Loss, Total	(10)
Foreign government bonds
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less than 12 months	2,964
Unrealized Loss, Less than 12 Months	(5)
Fair Value, Greater than 12 months	0
Unrealized Loss, Greater than 12 months	0
Fair Value, Total	2,964
Unrealized Loss, Total	(5)
Asset-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less than 12 months	16,130
Unrealized Loss, Less than 12 Months	(14)
Fair Value, Greater than 12 months	0
Unrealized Loss, Greater than 12 months	0
Fair Value, Total	16,130
Unrealized Loss, Total	$ (14)

Business Combination - Narrativ

Business Combination - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended		9 Months Ended
	Jun. 30, 2019	Apr. 30, 2019	Oct. 31, 2019	Jan. 31, 2019
Business Acquisition [Line Items]
Goodwill			$ 36,420	$ 10,997
Acquisition consideration held back			$ 0	$ 3,725
Developed technology
Business Acquisition [Line Items]
Useful Life (in years)			6 years 2 months 12 days
Compuverde AB
Business Acquisition [Line Items]
Acquisition related costs		$ 500
Cash consideration transferred		47,900
Long-term debt assumed and subsequently paid off		11,600
Goodwill		25,400
Net liabilities assumed		10,200
Deferred tax liabilities assumed		5,700
Consideration to be transferred		$ 15,900
Term of payments		2 years
Compuverde AB | Restricted Stock Units
Business Acquisition [Line Items]
Equity interests issued and issuable	$ 3,000
Compuverde AB | Developed technology
Business Acquisition [Line Items]
Finite-lived intangibles acquired		$ 38,400
Useful Life (in years)		7 years

Balance Sheet Components - Inve

Balance Sheet Components - Inventory (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Balance Sheet Components Disclosure [Abstract]
Raw materials	$ 3,163	$ 3,349
Finished goods	36,688	41,338
Inventory	$ 39,851	$ 44,687

Balance Sheet Components - Prop

Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Property Plant And Equipment [Line Items]
Total property and equipment	$ 387,784	$ 329,526
Less: accumulated depreciation and amortization	(257,548)	(204,173)
Property and equipment, net	130,236	125,353
Test equipment
Property Plant And Equipment [Line Items]
Total property and equipment	199,878	170,930
Computer equipment and software
Property Plant And Equipment [Line Items]
Total property and equipment	139,188	117,330
Furniture and fixtures
Property Plant And Equipment [Line Items]
Total property and equipment	8,483	6,980
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property and equipment	$ 40,235	$ 34,286

Balance Sheet Components - Narr

Balance Sheet Components - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Depreciation and amortization	$ 20.6	$ 16.9	$ 49.8	$ 60.3
Intangible assets amortization expense	$ 2.6	$ 0.9	$ 6.5	$ 1.6
Technology patents
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)			4 years
Developed technology
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)			6 years 2 months 12 days

Balance Sheet Components - Inta

Balance Sheet Components - Intangible Assets, Net (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 75,225	$ 27,825
Accumulated Amortization	(14,197)	(7,707)
Net Carrying Amount	61,028	20,118
Technology patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	19,125	10,125
Accumulated Amortization	(8,235)	(6,572)
Net Carrying Amount	10,890	3,553
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	56,100	17,700
Accumulated Amortization	(5,962)	(1,135)
Net Carrying Amount	$ 50,138	$ 16,565

Balance Sheet Components - Expe

Balance Sheet Components - Expected Amortization Expenses for Intangible Assets (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Balance Sheet Components Disclosure [Abstract]
Remainder of 2020	$ 2,771
2021	10,804
2022	9,846
2023	9,300
2024	9,300
Thereafter	19,007
Net Carrying Amount	$ 61,028	$ 20,118

Balance Sheet Components - Good

Balance Sheet Components - Goodwill (Details) $ in Thousands	9 Months Ended
	Oct. 31, 2019USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 10,997
Goodwill acquired	25,423
Ending balance	$ 36,420

Balance Sheet Components - Accr

Balance Sheet Components - Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Balance Sheet Components Disclosure [Abstract]
Taxes payable	$ 10,579	$ 7,146
Accrued marketing	10,159	6,173
Accrued travel and entertainment expenses	3,054	3,570
Acquisition consideration held back	0	3,725
Other accrued liabilities	24,431	19,246
Total accrued expenses and other liabilities	$ 48,223	$ 39,860

Convertible Senior Notes - Narr

Convertible Senior Notes - Narrative (Details)	1 Months Ended	9 Months Ended
	Apr. 30, 2018USD ($)sharesday$ / shares	Oct. 31, 2019USD ($)$ / shares	Oct. 31, 2018USD ($)	Apr. 04, 2018$ / shares
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of issuance costs		$ 0	$ 562,062,000
Debt issuance costs, net of amortization	$ 12,900,000
Closing price of stock (in dollars per share) | $ / shares		$ 19.46
Payment for purchase of capped calls		$ 0	$ 64,630,000
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	7,088,000
Additional Paid-In Capital
Debt Instrument [Line Items]
Debt issuance costs, net of amortization	$ 3,100,000	$ 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		$ 19.46		$ 19.83
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	$ 575,000,000
Interest rate (as a percent)	0.125%
Proceeds from issuance of convertible senior notes, net of issuance costs	$ 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		602,800,000
If-converted value		$ 425,900,000
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)	0.0380594
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	Oct. 31, 2019	Oct. 31, 2018	Apr. 30, 2018
Liability:
Less: debt issuance costs, net of amortization			$ (12,900)
Stockholders' equity:
Allocated value of the conversion feature		$ 133,265
Less: debt issuance costs			(12,900)
Convertible Senior Notes
Liability:
Principal	$ 575,000
Less: debt discount, net of amortization	(97,898)
Less: debt issuance costs, net of amortization	(7,088)		(9,800)
Net carrying amount of the Notes	470,014
Stockholders' equity:
Less: debt issuance costs	(7,088)		(9,800)
Additional Paid-In Capital
Liability:
Less: debt issuance costs, net of amortization	(3,068)		(3,100)
Stockholders' equity:
Allocated value of the conversion feature	136,333
Less: debt issuance costs	(3,068)		$ (3,100)
Additional paid-in capital	$ 133,265

Convertible Senior Notes - Inte

Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Debt Instrument [Line Items]
Total amortization of debt discount and debt issuance costs			$ 20,186	$ 14,414
Convertible Senior Notes
Debt Instrument [Line Items]
Amortization of debt discount	$ 6,431	$ 6,084	18,824	13,441
Amortization of debt issuance costs	465	441	1,362	973
Total amortization of debt discount and debt issuance costs	6,896	6,525	20,186	14,414
Contractual interest expense	181	181	539	405
Total interest expense related to the Notes	$ 7,077	$ 6,706	$ 20,725	$ 14,819
Effective interest rate of the liability component	5.60%	5.60%	5.60%	5.60%

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($)	Oct. 31, 2019	Jan. 31, 2019	Apr. 30, 2018
Lessee, Lease, Description [Line Items]
Outstanding letters of credit	$ 11,500,000	$ 10,800,000
Letter of Credit
Lessee, Lease, Description [Line Items]
Principal amount		$ 500,000
Convertible Senior Notes
Lessee, Lease, Description [Line Items]
Principal amount	$ 575,000,000		$ 575,000,000

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Millions	3 Months Ended
	Oct. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Undiscounted cash flows	$ 7.9
Term of contract (in years)	12 years 4 months 24 days
Building
Lessee, Lease, Description [Line Items]
Additional lease obligation	$ 19.4

Leases - Lease costs (Details)

Leases - Lease costs (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 31, 2019	Oct. 31, 2019
Leases [Abstract]
Fixed operating lease cost	$ 8,509	$ 25,220
Variable lease cost	2,122	6,464
Short-term lease cost (12 months or less)	1,412	3,757
Total lease cost	$ 12,043	$ 35,441

Leases - Future minimum lease p

Leases - Future minimum lease payments (Details) $ in Thousands	Oct. 31, 2019USD ($)
Leases [Abstract]
The remainder of 2020	$ 8,359
2021	34,411
2022	28,489
2023	23,507
2024	17,782
Thereafter	42,051
Total future lease payments	154,599
Less: imputed interest	(28,002)
Present value of lease liabilities	$ 126,597

Leases - Lease cash flow inform

Leases - Lease cash flow information (Details) $ in Thousands	9 Months Ended
	Oct. 31, 2019USD ($)
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities	$ 24,403
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	$ 14,937
Weighted-average remaining lease term (years)	5 years 8 months 15 days
Weighted-average discount rate (as a percent)	6.52%

Leases - Schedule Aggregate Fut

Leases - Schedule Aggregate Future Minimum Payments Under Non-Cancelable Operating Leases (Details) $ in Thousands	Jan. 31, 2019USD ($)
Leases [Abstract]
2020	$ 31,297
2021	28,573
2022	24,381
2023	20,440
2024	14,780
Thereafter	30,096
Total future lease payments	$ 149,567

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details)	Apr. 04, 2018USD ($)$ / sharesshares	Oct. 31, 2019stock_class$ / sharesshares	Aug. 31, 2019USD ($)	Jan. 31, 2019$ / sharesshares
Class of Stock [Line Items]
Shares authorized (in shares)		20,000,000		20,000,000
Shares issued (in shares)		0		0
Shares outstanding (in shares)		0		0
Number of classes of stock | stock_class		2
Shares authorized (in shares)		2,250,000,000		2,250,000,000
Closing price of stock (in dollars per share) | $ / shares		$ 19.46
Class A
Class of Stock [Line Items]
Shares authorized (in shares)		2,000,000,000		2,000,000,000
Par value per share (in dollars per share) | $ / shares		$ 0.0001		$ 0.0001
Shares issued (in shares)		259,920,406		243,524,000
Shares outstanding (in shares)		259,920,406		243,524,000
Value approved For repurchase | $			$ 150,000,000
Stock repurchased and retired (in shares)	1,008,573
Stock repurchased and retired during period, value | $	$ 20,000,000
Closing price of stock (in dollars per share) | $ / shares	$ 19.83	$ 19.46
Class B
Class of Stock [Line Items]
Shares authorized (in shares)		250,000,000		250,000,000
Par value per share (in dollars per share) | $ / shares		$ 0.0001		$ 0.0001

Equity Incentive Plans - Narrat

Equity Incentive Plans - Narrative (Details)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 28, 2019USD ($)	Oct. 31, 2019USD ($)periodshares	Oct. 31, 2018USD ($)	Oct. 31, 2019USD ($)planperiodshares	Oct. 31, 2018USD ($)	Dec. 31, 2015USD ($)
Share-based Payment Arrangement [Abstract]
Number of equity incentive plans | plan				2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense		$ 54,229,000	$ 58,329,000	$ 174,790,000	$ 155,938,000
2015 Equity Incentive Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price as percentage of fair market value of common stock				100.00%
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		$ 4,300,000	$ 11,600,000	$ 20,000,000	$ 26,200,000
Unrecognized stock-based compensation expense		$ 33,100,000		$ 33,100,000
Compensation cost (in years)				1 year 10 months 24 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				$ 11,400,000

Equity Incentive Plans - Equity

Equity Incentive Plans - Equity Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Oct. 31, 2019	Jan. 31, 2019	Apr. 04, 2018
Options Outstanding, Number of Shares
Beginning balance (in shares)	35,465,543
Options exercised (in shares)	(4,797,359)
Options forfeited/cancelled (in shares)	(468,544)
Ending balance (in shares)	30,199,640	35,465,543
Vested and exercisable (in shares)	25,550,655
Options Outstanding, Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 8.34
Options exercised (in dollars per share)	5.42
Options forfeited/cancelled (in dollars per share)	15.78
Ending balance (in dollars per share)	8.69	$ 8.34
Weighted Average Exercise Price, Vested and exercisable (in dollars per share)	$ 7.71
Weighted- Average Remaining Contractual Life
Weighted Average Remaining Contractual Life (in years)	3 years 10 months 24 days	5 years 4 months 24 days
Weighted Average Remaining Contractual Life, Vested and exercisable (in years)	4 years 7 months 6 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 325,184	$ 339,591
Aggregate Intrinsic Value, Vested and exercisable	$ 300,257
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of stock (in dollars per share)	$ 19.46
Unrecognized compensation cost, stock options	$ 15,000
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
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost (in years)	1 year 6 months
Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of stock (in dollars per share)	$ 19.46		$ 19.83

Equity Incentive Plans - Restri

Equity Incentive Plans - Restricted Stock Units (Details) - Restricted Stock Units - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Number of Restricted Stock Units Outstanding
Unvested, Beginning balance (in shares)				21,917,550
Granted (in shares)				10,889,807
Vested (in shares)				(6,910,339)
Forfeited (in shares)				(2,239,739)
Unvested, Ending balance (in shares)	21,917,550	23,657,279		23,657,279
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)				$ 17.94
Granted (in dollars per share)				19.35
Vested (in dollars per share)				17.21
Forfeited (in dollars per share)				18.76
Ending balance (in dollars per share)	$ 17.94	$ 18.72		$ 18.72
Aggregate Intrinsic Value	$ 392,515	$ 460,371		$ 460,371
Share-based compensation expense		41,000	$ 31,200	118,700	$ 87,100
Compensation not yet recognized		$ 405,800		$ 405,800
Compensation cost (in years)				2 years 10 months 24 days

Equity Incentive Plans - Rest_2

Equity Incentive Plans - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 54,229	$ 58,329	$ 174,790	$ 155,938
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		4,400	$ 7,500	19,200	$ 17,700
Unrecognized stock-based compensation expense		$ 21,500		$ 21,500
Compensation cost (in years)				2 years 1 month 6 days
Number of Restricted Stock Outstanding
Unvested, Beginning balance (in shares)				2,267,569
Granted (in shares)				1,399,688
Vested (in shares)				(1,063,977)
Unvested, Ending balance (in shares)	2,267,569	2,603,280		2,603,280
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)				$ 18.70
Granted (in dollars per share)				20.30
Vested (in dollars per share)				19.32
Ending balance (in dollars per share)	$ 18.70	$ 19.42		$ 19.42
Aggregate Intrinsic Value	$ 40,612	$ 50,660		$ 50,660
Restricted Stock | Performance Vesting at Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (as a percent)				100.00%
Number of Restricted Stock Outstanding
Granted (in shares)	183,902			1,291,194
Restricted Stock | Previously Issued Performance Awards
Number of Restricted Stock Outstanding
Granted (in shares)				108,494
Restricted Stock | Minimum | Performance Vesting at Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (as a percent)				0.00%
Restricted Stock | Maximum | Performance Vesting at Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (as a percent)				160.00%

Equity Incentive Plans - Stock-

Equity Incentive Plans - Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 54,229	$ 58,329	$ 174,790	$ 155,938
Cost of revenue—product
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	912	862	2,843	2,190
Cost of revenue—support subscription
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	3,517	3,327	11,101	8,940
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	27,827	24,634	85,180	67,956
Research and development | Compuverde AB
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1,900		4,200
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	16,802	18,681	51,171	49,890
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 5,171	$ 10,825	$ 24,495	$ 26,962

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		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Earnings Per Share [Abstract]
Net loss	$ (29,982)	$ (28,180)	$ (196,336)	$ (152,607)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	255,047	235,205	250,618	229,505
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.12)	$ (0.12)	$ (0.78)	$ (0.66)

Net Loss per Share Attributab_4

Net Loss per Share Attributable to Common Stockholders - Shares Excluded (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount (in shares)	80,207	82,704	81,911	80,220
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)	30,769	37,814	32,150	41,201
Unvested RSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount (in shares)	24,251	19,493	24,544	19,488
Restricted stock and early exercised stock options 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)	2,732	3,277	2,762	2,938
Shares issuable pursuant to 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)	571	236	571	80
Shares related to 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	16,513

Other Income (Expense), Net - O

Other Income (Expense), Net - Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Other Income and Expenses [Abstract]
Interest income	$ 6,770	$ 5,497	$ 20,376	$ 12,151
Interest expense	(7,077)	(6,706)	(20,725)	(14,819)
Foreign currency transactions gains (losses)	97	(1,667)	(2,329)	(6,074)
Other income (expense)	219	(13)	219	822
Total other income (expense), net	$ 9	$ (2,889)	$ (2,459)	$ (7,920)

Segment Information - Narrative

Segment Information - Narrative (Details)	9 Months Ended
	Oct. 31, 2019segment
Segment Reporting [Abstract]
Number of business activities	1
Number of reportable segments	1

Segment Information - Revenue b

Segment Information - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 428,409	$ 372,779	$ 1,151,436	$ 937,608
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	312,010	263,488	835,545	678,166
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 116,399	$ 109,291	$ 315,891	$ 259,442

Segment Information - Long-Live

Segment Information - Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 130,236	$ 125,353
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	119,920	120,876
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 10,316	$ 4,477

Uncategorized Items - pstg-2019

Label	Element	Value
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	$ 15,822,000
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	$ 15,287,000