Splunk (SPLK) 10-Q 5 Sep 18 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jul. 31, 2018	Aug. 29, 2018
Document and Entity Information
Entity Registrant Name	SPLUNK INC
Entity Central Index Key	1,353,283
Document Type	10-Q
Document Period End Date	Jul. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--01-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		146,625,790
Document Fiscal Year Focus	2,019
Document Fiscal Period Focus	Q2

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Current assets:
Cash and cash equivalents	$ 419,681	$ 545,947
Investments, current	471,902	619,203
Accounts receivable, net	247,827	396,413
Prepaid expenses and other current assets	65,837	70,021
Deferred commissions, current	57,419	52,451
Total current assets	1,262,666	1,684,035
Investments, non-current	9,750	5,375
Property and equipment, net	156,409	160,880
Intangible assets, net	105,865	48,142
Goodwill	503,388	161,382
Deferred commissions, non-current	43,435	37,920
Other assets	70,004	41,711
Total assets	2,151,517	2,139,445
Current liabilities:
Accounts payable	14,470	11,040
Accrued compensation	133,015	145,365
Accrued expenses and other liabilities	99,251	84,631
Deferred revenue, current	494,610	489,913
Total current liabilities	741,346	730,949
Deferred revenue, non-current	166,976	178,792
Other liabilities, non-current	96,359	98,383
Total non-current liabilities	263,335	277,175
Total liabilities	1,004,681	1,008,124
Commitments and contingencies (Note 3)
Stockholders' equity:
Common stock: $0.001 par value; 1,000,000,000 shares authorized; 146,611,514 shares issued and outstanding at July 31, 2018, and 142,835,123 shares issued and outstanding at January 31, 2018	146	143
Accumulated other comprehensive income (loss)	(2,730)	156
Additional paid-in capital	2,327,885	2,086,893
Accumulated deficit	(1,178,465)	(955,871)
Total stockholders' equity	1,146,836	1,131,321
Total liabilities and stockholders' equity	$ 2,151,517	$ 2,139,445

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jul. 31, 2018	Jan. 31, 2018
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	146,611,514	142,835,123
Common stock, shares outstanding	146,611,514	142,835,123

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Revenues
License		$ 200,668	$ 147,231	$ 339,643	$ 249,793
Maintenance and services		187,635	132,993	360,299	257,199
Total revenues		388,303	280,224	699,942	506,992
Cost of revenues
License	[1]	5,671	3,159	10,795	6,087
Maintenance and services	[1]	78,077	56,717	150,923	111,952
Total cost of revenues	[1]	83,748	59,876	161,718	118,039
Gross profit		304,555	220,348	538,224	388,953
Operating expenses
Research and development	[1]	106,739	71,774	193,096	143,072
Sales and marketing	[1]	243,830	186,637	461,866	360,098
General and administrative	[1]	57,844	39,139	108,586	75,635
Total operating expenses	[1]	408,413	297,550	763,548	578,805
Operating loss		(103,858)	(77,202)	(225,324)	(189,852)
Interest and other income (expense), net
Interest income (expense), net		1,506	(164)	2,620	(692)
Other income (expense), net		(336)	(874)	(471)	(1,482)
Total interest and other income (expense), net		1,170	(1,038)	2,149	(2,174)
Loss before income taxes		(102,688)	(78,240)	(223,175)	(192,026)
Income tax provision (benefit)		811	353	(1,177)	1,691
Net loss		$ (103,499)	$ (78,593)	$ (221,998)	$ (193,717)
Net loss per share:
Basic and diluted (in dollars per share)		$ (0.71)	$ (0.57)	$ (1.54)	$ (1.40)
Weighted-average shares outstanding:
Basic and diluted (in shares)		145,030	139,063	144,306	138,436
Stock-based compensation				$ 199,664	$ 182,422
[1]	Amounts include stock-based compensation expense for the three months ended July 31, 2018 and 2017 as follows: Cost of revenues, $8,947 thousand and $8,410 thousand; Research and development, $33,597 thousand and $25,991 thousand; Sales and marketing, $45,546 thousand and $42,652 thousand; General and administrative, $16,953 thousand and $15,314 thousand Stock-based compensation expense for the six months ended July 31, 2018 and 2017 as follows: Cost of revenues, $17,751 thousand and $16,602 thousand; Research and development, $60,013 thousand and $52,788 thousand; Sales and marketing, $88,593 thousand and $83,295 thousand; General and administrative, $33,307 thousand and $29,737 thousand

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Stock-based compensation			$ 199,664	$ 182,422
Cost of revenues
Stock-based compensation	$ 8,947	$ 8,410	17,751	16,602
Research and development
Stock-based compensation	33,597	25,991	60,013	52,788
Sales and marketing
Stock-based compensation	45,546	42,652	88,593	83,295
General and administrative
Stock-based compensation	$ 16,953	$ 15,314	$ 33,307	$ 29,737

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Net loss	$ (103,499)	$ (78,593)	$ (221,998)	$ (193,717)
Other comprehensive gain (loss):
Net unrealized gain (loss) on investments (net of tax)	515	33	707	(449)
Foreign currency translation adjustments	(1,707)	2,207	(3,593)	2,113
Total other comprehensive gain (loss)	(1,192)	2,240	(2,886)	1,664
Comprehensive loss	$ (104,691)	$ (76,353)	$ (224,884)	$ (192,053)

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Cash flows from operating activities
Net loss	$ (221,998)	$ (193,717)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	24,167	19,916
Amortization of deferred commissions	32,877	20,653
Amortization of investment premiums (accretion of discounts)	(537)	342
Stock-based compensation	199,664	182,422
Deferred income taxes	(125)	(866)
Changes in operating assets and liabilities, net of acquisitions
Accounts receivable, net	156,362	31,706
Prepaid expenses and other assets	(21,937)	(7,883)
Deferred commissions	(43,360)	(24,322)
Accounts payable	2,990	1,963
Accrued payroll and compensation	(11,833)	(6,264)
Accrued expenses and other liabilities	6,259	8,107
Deferred revenue	(12,518)	32,489
Net cash provided by operating activities	110,011	64,546
Cash flows from investing activities
Purchases of investments	(198,631)	(340,697)
Maturities of investments	347,176	338,265
Acquisitions, net of cash acquired	(394,910)	(17,223)
Purchases of property and equipment	(7,858)	(8,513)
Other investment activities	(4,375)	0
Net cash used in investing activities	(258,598)	(28,168)
Cash flows from financing activities
Proceeds from exercise of stock options	1,354	1,973
Taxes paid related to net share settlement of equity awards	(779)	(59,109)
Repayment of financing lease obligation	(1,218)	(802)
Proceeds from employee stock purchase plans	24,201	19,282
Net cash provided by (used in) financing activities	23,558	(38,656)
Effect of exchange rate changes on cash and cash equivalents	(1,237)	742
Net increase (decrease) in cash and cash equivalents	(126,266)	(1,536)
Cash and cash equivalents
Beginning of period	545,947	421,346
End of period	419,681	419,810
Supplemental disclosures
Cash paid for income taxes	4,035	3,883
Cash paid for interest expense related to financing lease obligation	4,123	3,974
Non-cash investing and financing activities
Increase (decrease) in accrued purchases of property and equipment	$ 129	$ 26

Description of the Business and

Description of the Business and Significant Accounting Policies	6 Months Ended
	Jul. 31, 2018
Accounting Policies [Abstract]
Description of the Business and Significant Accounting Policies	Description of the Business and Significant Accounting Policies Business Splunk Inc. (“we,” “us,” “our”) provides innovative software solutions that enable organizations to gain real-time operational intelligence by harnessing the value of their data. Our offerings enable users to collect, index, search, explore, monitor, correlate and analyze data regardless of format or source. Our offerings address large and diverse data sets commonly referred to as big data and are specifically tailored for machine data. Machine data is produced by nearly every software application and electronic device across an organization and contains a definitive, time-stamped record of various activities, such as transactions, customer and user behavior, and security threats. Our offerings help users derive new insights from machine data that can be used to, among other things, improve service levels, reduce operational costs, mitigate security risks, demonstrate and maintain compliance, and drive better business decisions. We were incorporated in California in October 2003 and reincorporated in Delaware in May 2006. Fiscal Year Our fiscal year ends on January 31. References to fiscal 2019 or fiscal year 2019, for example, refer to the fiscal year ending January 31, 2019. Basis of Presentation Effective February 1, 2018, we adopted the Accounting Standards Update (ASU) No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” as discussed in “Recently Adopted Accounting Standards” below. Disclosures in this Quarterly Report on Form 10-Q have been updated to comply with the new standards, as indicated by the “As Adjusted” reference in these condensed consolidated financial statements and related notes. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated balance sheet data as of January 31, 2018 was derived from audited financial statements as adjusted to reflect the impact of the full retrospective adoption of Topic 606; but does not include all disclosures required by GAAP. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Annual Report on Form 10-K for the fiscal year ended January 31, 2018 , filed with the SEC on March 30, 2018 . In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to state 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 2019. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting periods covered by the financial statements and accompanying notes. In particular, we make estimates with respect to the stand-alone selling price for each distinct performance obligation included in customer contracts with multiple performance obligations, uncollectible accounts receivable, the assessment of the useful life and recoverability of long-lived assets (property and equipment, goodwill and identified intangibles), the period of benefit for deferred commissions, stock-based compensation expense, the fair value of assets acquired and liabilities assumed for business combinations, income taxes, leases and contingencies. Actual results could differ from those estimates. Segments We operate our business as one operating segment: the development and marketing of software solutions that enable our customers to gain real-time operational intelligence by harnessing the value of their data. Our chief operating decision maker is our Chief Executive Officer, who reviews financial information presented on a consolidated basis for purposes of making operating decisions, assessing financial performance and allocating resources. Principles of Consolidation The accompanying unaudited condensed consolidated financial statements include the accounts of Splunk Inc. and its direct and indirect wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated upon consolidation. Revenue Recognition We generate revenues primarily in the form of software license and related maintenance fees, cloud services and other services fees. Licenses for on-premises software are either perpetual or term licenses and provide the customer with a right to use the software, upon delivery to the customer. Typically, when purchasing a perpetual license, a customer also purchases one year of maintenance for which we charge a percentage of the license fee. When a term license is purchased, maintenance is bundled with the license for the term of the license period. Cloud services are provided on a subscription basis and give our customers access to our cloud solutions, which include related customer support. Other services include training and professional services that are not integral to the functionality of the licenses or cloud services. Revenue from on-premises licenses is recognized upfront upon transfer of control of the software, which occurs at delivery, or when the license term commences, if later. We recognize revenue from maintenance contracts ratably over the service period. Cloud services revenue is recognized ratably over the cloud service term. Training and professional services are provided either on a time and material basis, in which revenues are recognized as services are delivered, or over a contractual term, in which revenues are recognized ratably. With respect to contracts that include customer acceptance provisions, we recognize revenue upon customer acceptance. Our policy is to record revenues net of any applicable sales, use or excise taxes. Our contracts with customers often contain multiple performance obligations. For these contracts, we account for individual performance obligations separately if they are distinct. The transaction price is allocated to the separate performance obligations on a relative standalone selling price (“SSP”) basis. We determine the SSP based on an observable standalone selling price when it is available, as well as other factors, including, the price charged to customers, our discounting practices, and our overall pricing objectives, while maximizing observable inputs. In situations where pricing is highly variable or uncertain, we estimate the SSP using a residual approach. A receivable is recorded in the period we deliver products or provide services, or when we have an unconditional right to payment. Some of our multi-year on-premises license contracts are invoiced annually and we generally recognize the total amount of the license revenues upfront and record a corresponding receivable, if we have an unconditional right to receive payment. Current and non-current accounts receivable, net of allowance for doubtful accounts, was $281.6 million and $396.4 million as of July 31, 2018 and January 31, 2018, respectively. Payment terms and conditions vary by contract type, although our terms generally include a requirement of payment within 30 to 60 days. In instances where the timing of revenue recognition differs from the timing of payment, we have determined our contracts do not include a significant financing component. The primary purpose of our invoicing terms is to provide customers with simplified and predictable ways of purchasing our products and services, not to receive financing from our customers or to provide customers with financing. Deferred revenue is recorded when we invoice a contract prior to recognizing revenue. It is comprised mainly of balances related to maintenance and cloud services invoiced at the beginning of each service period. Deferred revenue also includes balances for training and professional services for which a payment has been received in advance of performance, as well as for licenses that we invoice and deliver prior to the license term commencing. Deferred Sales Commissions Sales commissions paid to our sales force and the related payroll taxes are considered incremental and recoverable costs of obtaining a contract with a customer. These costs are capitalized and recorded in “Deferred commissions, current and non-current” in our condensed consolidated balance sheets. We generally amortize these costs over the remaining contractual term of our customer contracts, consistent with the pattern of revenue recognition of each performance obligation, for contracts in which the commissions paid on the initial and renewal contracts are commensurate. For certain contracts in which the commissions paid on the initial and renewal contracts are not commensurate, we amortize the commissions paid on the initial contract over an expected period of benefit, which we have determined to be approximately five years. We have determined the period of benefit by taking into consideration our customer contracts, the duration of our relationships with our customers and our technology. In capitalizing and amortizing deferred commissions, we have elected to apply a portfolio approach. We include amortization of deferred commissions in “Sales and marketing expense” in our condensed consolidated statements of operations. There were no impairments to deferred commissions for all periods presented. Equity Investments Equity investments without readily determinable fair values are accounted for at cost, less impairment and adjusted for subsequent observable price changes obtained from transactions for identical or similar investments issued by the same issuer. Changes in the basis of the equity investment will be recognized in “Other income (expense), net.” Investments in entities where we have the ability to exercise significant influence, but not control, over the investee are accounted for using the equity method of accounting. Our results of operations will include, as a component of “Other income (expense), net,” our share of the net income or loss of the equity investments accounted for under the equity method of accounting. Stock-Based Compensation We recognize compensation expense for all share-based payment awards, including stock options, restricted stock units (“RSUs”), performance units (“PSUs”) and restricted stock awards (“RSAs”), based on the estimated fair value of the award on the grant date over the related vesting periods. The expense recorded is based on awards ultimately expected to vest and therefore is reduced by estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We calculate the fair value of options using the Black-Scholes method and expense using the straight-line attribution approach. We account for equity awards issued to non-employees, such as consultants, in accordance with the guidance relating to equity instruments that are issued to other than employees for acquiring, or in conjunction with selling, goods or services, using the Black-Scholes method to determine the fair value of such instruments. Awards granted to non-employees are remeasured over the vesting period, and the resulting value is recorded as an expense over the period the services are received. The fair value of each option grant and stock purchase right granted under the Employee Stock Purchase Plan (“ESPP”) was estimated on the date of grant using the Black-Scholes option pricing model. We recognize stock-based compensation expense related to our ESPP on a straight-line basis over the offering period, which is twelve months. Stock-based compensation expense is recognized net of estimated forfeiture activity. The determination of the grant date fair value of options using an option-pricing model is affected by assumptions regarding a number of other complex and subjective variables, which include our expected stock price volatility over the expected term of the options, stock option exercise and cancellation behaviors, risk-free interest rates and expected dividends. The number of PSUs earned and eligible to vest are determined based on achievement of certain performance conditions and/or market conditions and the recipients' continued service with us. For awards subject to service and performance conditions, the number of shares of our stock issued pursuant to the award can range from 0% to 200% of the target amount. For awards subject to service and performance conditions that also include market conditions, the number of shares of our stock issued pursuant to the award can range from 0% to 300% of the target amount. Compensation expense for PSUs with performance conditions is measured using the fair value at the date of grant and recorded over the vesting period under the graded-vesting attribution method, and may be adjusted over the vesting period based on interim estimates of performance against the pre-set objectives. We use a Monte Carlo option-pricing model to determine the fair value of PSUs with market conditions. Recently Adopted Accounting Standards In May 2017, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2017-09 (Topic 718), Scope of Modification Accounting. The new standard clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. We adopted this new standard as of February 1, 2018. The adoption of this new standard did not have an impact on our condensed consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-01 (Topic 805), Business Combinations - Clarifying the Definition of a Business. The new standard narrows the application of when an integrated set of assets and activities is considered a business and provides a framework to assist entities in evaluating whether both an input and a substantive process are present to be considered a business. We adopted this new standard as of February 1, 2018, and anticipate that the adoption of the new guidance will result in more transactions being accounted for as asset acquisitions rather than business combinations and that the new standard will impact our consideration of strategic investments. The adoption of this new standard did not have an impact on our condensed consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16 (Topic 740), Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory, which includes a revision of the accounting for the income tax consequences of intra-entity transfers of assets other than inventory to reduce the complexity in accounting standards. We adopted this new standard as of February 1, 2018 with an immaterial cumulative effect adjustment recorded in accumulated deficit as of February 1, 2018. In January 2016, the FASB issued ASU No. 2016-01 (Subtopic 825-10), Financial Instruments - Overall. The amendments in this update, and recent clarifications issued by the FASB through ASU No. 2018-03 and ASU No. 2018-04, address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments, and require equity securities to be measured at fair value with changes in fair value recognized through net income. We adopted this new standard as of February 1, 2018 on a prospective basis . As part of the adoption, we elected to apply the measurement alternative for our non-marketable equity investments that do not have readily determinable fair values, measuring them at cost, less any impairment, plus or minus adjustments resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. The adoption of these standards did not result in an adjustment for our non-marketable equity investments. In May 2014, the FASB issued ASU No. 2014-09 (Topic 606), Revenue from Contracts with Customers, which supersedes the revenue recognition requirements in Accounting Standards Codification 605, Revenue Recognition and establishes a new revenue standard. This new standard is based on the principle that revenue is recognized to depict the transfer of control of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The standard also requires additional disclosures about the nature, amount, timing and uncertainty of revenues and cash flows arising from customer contracts, including significant judgments and changes in judgments, and assets recognized from costs incurred to obtain or fulfill a contract. The FASB has also issued several amendments to the new standard which were designed to clarify and simplify the adoption process. In preparation for adoption of the new standard, we updated our accounting policies, systems, internal controls and processes. We adopted Topic 606 as of February 1, 2018 using the full retrospective method, which required us to adjust our historical financial information for fiscal years 2017 and 2018 to be consistent with the new standard. The most significant impacts of the standard relate to the timing of revenue recognition for arrangements involving term licenses, deferred revenue and sales commissions. Under the new revenue standard, we are required to recognize term license revenues upon the transfer of the license and the associated maintenance revenues over the contract period. Additionally, some deferred revenue, primarily from arrangements involving term licenses, was never recognized as revenue and instead is now a part of the cumulative effect adjustment within accumulated deficit. Finally, we are required to capitalize and amortize incremental costs of obtaining a contract, such as certain sales commission costs, over the remaining contractual term or over an expected period of benefit, which we have determined to be approximately five years. We applied the following practical expedients permitted under Topic 606. For all reporting periods presented before the date of initial adoption, we have elected not to disclose the amount of the transaction price allocated to the remaining performance obligations or provide an explanation of when we expect to recognize that amount as revenue. Additionally, we have also elected not to separately evaluate each contract modification that occurred before the initial adoption date. We have elected not to assess whether a contract has a significant financing component if we expect at contract inception that the period between payment and the transfer of products or services will be one year or less. The following tables present the impact of the new revenue standard to the reported results on our selected condensed consolidated statements of operations data and condensed consolidated balance sheet data and (in thousands, except per share data): Selected Condensed Consolidated Statements of Operations Data Three Months Ended July 31, 2017 As Reported Impact of Adoption As Adjusted Revenues License $ 142,851 $ 4,380 $ 147,231 Maintenance and services 137,113 (4,120 ) 132,993 Total revenues 279,964 260 280,224 Gross profit 220,088 260 220,348 Operating expenses Sales and marketing 191,284 (4,647 ) 186,637 Operating loss (82,109 ) 4,907 (77,202 ) Net loss $ (83,500 ) $ 4,907 $ (78,593 ) Basic and diluted net loss per share $ (0.60 ) $ 0.03 $ (0.57 ) Six Months Ended July 31, 2017 As Reported Impact of Adoption As Adjusted Revenues License $ 259,577 $ (9,784 ) $ 249,793 Maintenance and services 262,835 (5,636 ) 257,199 Total revenues 522,412 (15,420 ) 506,992 Gross profit 404,373 (15,420 ) 388,953 Operating expenses Sales and marketing 365,232 (5,134 ) 360,098 Operating loss (179,566 ) (10,286 ) (189,852 ) Net loss $ (183,431 ) $ (10,286 ) $ (193,717 ) Basic and diluted net loss per share $ (1.33 ) $ (0.07 ) $ (1.40 ) Selected Condensed Consolidated Balance Sheet Data January 31, 2018 As Reported Impact of Adoption As Adjusted Assets Accounts receivable, net $ 391,799 $ 4,614 $ 396,413 Deferred commissions, current — 52,451 52,451 Deferred commissions, non-current — 37,920 37,920 Liabilities and Stockholders’ Equity Accrued expenses and other liabilities 77,160 7,471 84,631 Deferred revenue, current 635,253 (145,340 ) 489,913 Deferred revenue, non-current 269,954 (91,162 ) 178,792 Accumulated deficit (1,279,887 ) 324,016 (955,871 ) The adoption of Topic 606 had no impact to cash provided by or used in operating, financing, or investing activities on our condensed consolidated statements of cash flows. Recently Issued Accounting Pronouncements In June 2018, the FASB issued ASU No. 2018-07 (Topic 718), Compensation - Stock Compensation: Improvements to Nonemployee Share-Based Payment Accounting. Under the new standard, entities will no longer be required to value non-employee share-based payment awards differently from employee awards. Upon transition, entities are required to measure non-employee awards at their grant-date fair value as of the adoption date. The standard is effective for our first quarter of fiscal 2020, although early adoption is permitted. We do not expect this standard will have a material impact on our condensed consolidated financial statements upon adoption. In June 2016, the FASB issued ASU No. 2016-13 (Topic 326), Financial Instruments - Credit Losses. The amendments in this update require a financial asset (or a group of financial assets) measured at an amortized cost basis to be presented at the net amount expected to be collected. The new approach to estimating credit losses (referred to as the current expected credit losses model) applies to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loans and held-to-maturity debt securities. The standard is effective for our first quarter of fiscal 2021, although early adoption is permitted. We are currently evaluating whether the adoption of this standard will have a material impact on our condensed consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02 (Topic 842), Leases, which supersedes the lease recognition requirements in ASC Topic 840, Leases. The standard requires an entity to recognize right-of-use assets and lease liabilities arising from a lease for operating leases, initially measured at the present value of the lease payments on the condensed consolidated balance sheets. The impact of such leases on the condensed consolidated statements of operations and cash flows will continue to be treated in a similar manner under current GAAP. The standard also requires additional qualitative and quantitative disclosures. In July 2018, the FASB issued ASU No. 2018-10, Codification Improvements to Topic 842, Leases, which clarifies the codification or corrects unintended application of the guidance. In addition, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, which provides an optional transition method to apply the new lease standard at the adoption date, as opposed to the beginning of the earliest year presented, and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The standard is effective for our first quarter of fiscal 2020, although early adoption is permitted. We are currently evaluating the impact of this standard on our condensed consolidated financial statements and related disclosures. We anticipate that most of our office leases will be recognized as lease liabilities and corresponding right-of-use assets, and will accordingly have a material impact on our condensed consolidated balance sheets upon adoption.

Investments and Fair Value Meas

Investments and Fair Value Measurements	6 Months Ended
	Jul. 31, 2018
Investments, Debt And Equity Securities And Fair Value Disclosures [Abstract]
Investments and Fair Value Measurements	Investments and Fair Value Measurements The carrying amounts of certain of our financial instruments including cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate fair value due to their short-term maturities. Assets and liabilities recorded at fair value in the financial statements are categorized based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels that are directly related to the amount of subjectivity associated with the inputs to the valuation of these assets or liabilities are as follows: Level 1—Observable inputs, such as quoted prices in active markets for identical assets or liabilities. Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. 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. Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability. The following table sets forth the fair value of our financial assets that were measured on a recurring basis as of July 31, 2018 and January 31, 2018 (in thousands): July 31, 2018 January 31, 2018 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets: Money market funds $ 368,655 $ — $ — $ 368,655 $ 341,687 $ — $ — $ 341,687 U.S. treasury securities — 471,902 — 471,902 — 619,203 — 619,203 Other — — 4,000 4,000 — — — — Reported as: Assets: Cash and cash equivalents $ 368,655 $ 341,687 Investments, current 471,902 619,203 Investments, non-current 4,000 — Total $ 844,557 $ 960,890 Our investments in money market funds are measured at fair value on a recurring basis. These money market funds are actively traded and reported daily through a variety of sources. The fair value of the money market fund investments is classified as Level 1. The following table represents our investments in U.S. treasury securities, which we have classified as available-for-sale investments as of July 31, 2018 (in thousands): July 31, 2018 Amortized Cost Unrealized Gains Unrealized Losses Fair Value Investments, current: U.S. treasury securities $ 472,338 $ — $ (436 ) $ 471,902 Total available-for-sale investments in U.S. treasury securities $ 472,338 $ — $ (436 ) $ 471,902 The following table represents our investments in U.S. treasury securities, which we have classified as available-for-sale investments as of January 31, 2018 (in thousands): January 31, 2018 Amortized Cost Unrealized Gains Unrealized Losses Fair Value Investments, current: U.S. treasury securities $ 620,345 $ — $ (1,142 ) $ 619,203 Total available-for-sale investments in U.S. treasury securities $ 620,345 $ — $ (1,142 ) $ 619,203 As of July 31, 2018 , and January 31, 2018 , the following marketable securities were in an unrealized loss position (in thousands): Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses July 31, 2018 U.S. treasury securities $ 471,902 $ (436 ) $ — $ — $ 471,902 $ (436 ) January 31, 2018 U.S. treasury securities $ 619,203 $ (1,142 ) $ — $ — $ 619,203 $ (1,142 ) As of July 31, 2018 , we did not consider any of our investments to be other-than-temporarily impaired. The contractual maturities of our investments are as follows (in thousands): July 31, 2018 Due within one year $ 471,902 Total $ 471,902 Investments with maturities of less than 12 months from the balance sheet date are classified as current assets, which are available for use to fund current operations. Investments with maturities greater than 12 months from the balance sheet date are classified as long-term assets. Equity Investments Our equity investments are reported in “Investments, non-current” on our condensed consolidated balance sheets. The following table provides a summary of our equity investments as of July 31, 2018 and January 31, 2018 (in thousands): July 31, 2018 January 31, 2018 Equity investments without readily determinable fair values $ 5,000 $ 5,000 Equity investments under the equity method of accounting 750 375 Total $ 5,750 $ 5,375

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jul. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Lease Commitments We lease our office spaces under non-cancelable leases. Rent expense, net of sublease income, for our operating leases was $6.1 million and $5.5 million for the three months ended July 31, 2018 and 2017 , respectively, and $12.2 million and $10.8 million for the six months ended July 31, 2018 and 2017 , respectively. On June 18, 2018, we renewed our office lease at 250 Brannan Street for approximately 101,000 square feet located in San Francisco, California. This lease is expected to commence in the first quarter of fiscal 2020 for a term of 147 months. Our total obligation for the base rent will be approximately $137.6 million . The following summarizes our operating lease commitments as of July 31, 2018 (in thousands): Payments Due by Period Total Less Than 1 1-3 years 3-5 years More Than 5 Operating lease commitments (1) $ 293,571 $ 27,431 $ 60,900 $ 54,512 $ 150,728 _________________________ (1) We have entered into sublease agreements for portions of our office space and the future rental income of $6.2 million from these agreements has been included as an offset to our future minimum rental payments. Financing Lease Obligation On April 29, 2014, we entered into an office lease (the “Lease”) for approximately 182,000 square feet located at 270 Brannan Street, San Francisco, California (the “Premises”). The Premises is allocated between the “Initial Premises” and “Additional Premises,” which are each approximately 91,000 square feet of rentable space. The term of the Additional Premises begins one year after the term of the Initial Premises, which began in August 2015, and each have a term of 84 months. Our total obligation for the base rent is approximately $92.0 million . On May 13, 2014, we entered into an irrevocable, standby letter of credit with Silicon Valley Bank for $6.0 million to serve as a security deposit for the Lease. As a result of our involvement during the construction period, whereby we had certain indemnification obligations related to the construction, we were considered, for accounting purposes only, the owner of the construction project under build-to-suit lease accounting. We have recorded project construction costs incurred by the landlord as an asset and a corresponding long-term liability in “Property and equipment, net” and “Other liabilities, non-current,” respectively, on our condensed consolidated balance sheets. We moved into the Premises in February 2016. We have determined that the lease does not meet the criteria for “sale-leaseback” treatment, due to our continuing involvement in the construction project resulting from our standby letter of credit. Accordingly, the Lease will continue to be accounted for as a financing obligation. As of July 31, 2018 , future payments on the financing lease obligation are as follows (in thousands): Fiscal Period: Remaining six months of fiscal 2019 $ 6,288 Fiscal 2020 12,928 Fiscal 2021 13,316 Fiscal 2022 13,715 Fiscal 2023 14,127 Thereafter 8,142 Total future minimum lease payments $ 68,516 Legal Proceedings We are subject to certain routine legal and regulatory proceedings, as well as demands and claims that arise in the normal course of our business. We make a provision for a liability relating to legal matters when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. These provisions are reviewed at least quarterly and adjusted to reflect the impact of negotiations, estimated settlements, legal rulings, advice of legal counsel and other information and events pertaining to a particular matter. In our opinion, resolution of any pending claims (either individually or in the aggregate) is not expected to have a material adverse impact on our condensed consolidated results of operations, cash flows or financial position, nor is it possible to provide an estimated amount of any such loss. However, depending on the nature and timing of any such dispute, an unfavorable resolution of a matter could materially affect our future results of operations or cash flows, or both, in a particular quarter. Indemnification Arrangements During the ordinary course of business, we may indemnify, hold harmless and agree to reimburse for losses suffered or incurred, our customers, vendors and each of their affiliates for certain intellectual property infringement and other claims by third parties with respect to our offerings, in connection with our commercial license arrangements or related to general business dealings with those parties. As permitted under Delaware law, we have entered into indemnification agreements with our officers, directors and certain employees, indemnifying them for certain events or occurrences while they serve as our officers or directors or those of our direct and indirect subsidiaries. To date, there have not been any costs incurred in connection with such indemnification obligations; therefore, there is no accrual of such amounts as of July 31, 2018 . We are unable to estimate the maximum potential impact of these indemnifications on our future results of operations.

Property and Equipment

Property and Equipment	6 Months Ended
	Jul. 31, 2018
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment Property and equipment are stated at cost, net of accumulated depreciation and amortization. These assets are depreciated and amortized using the straight-line method over their estimated useful lives. Property and equipment consisted of the following as of July 31, 2018 and January 31, 2018 (in thousands): As of July 31, 2018 January 31, 2018 Computer equipment and software $ 73,842 $ 69,457 Furniture and fixtures 18,251 18,090 Leasehold and building improvements (1) 70,853 67,348 Building (2) 82,250 82,250 Property and equipment, gross 245,196 237,145 Less: accumulated depreciation and amortization (88,787 ) (76,265 ) Property and equipment, net $ 156,409 $ 160,880 _________________________ (1) Includes costs related to assets not yet placed into service of $7.2 million and $2.8 million , as of July 31, 2018 and January 31, 2018, respectively. (2) This relates to the capitalization of construction costs in connection with our financing lease obligation, where we are considered the owner of the asset, for accounting purposes only. There is a corresponding long-term liability for this obligation on our condensed consolidated balance sheets under “Other liabilities, non-current.” Refer to Note 3 “Commitments and Contingencies” for details. Depreciation and amortization expense on Property and equipment was $6.5 million and $6.6 million for the three months ended July 31, 2018 and 2017 , respectively, and $13.1 million and $13.0 million for the six months ended July 31, 2018 and 2017 , respectively.

Acquisitions, Goodwill and Inta

Acquisitions, Goodwill and Intangible Assets	6 Months Ended
	Jul. 31, 2018
Business Combinations [Abstract]
Acquisition, Goodwill and Intangible Assets	Acquisitions, Goodwill and Intangible Assets VictorOps On June 22, 2018, we acquired 100% of the voting equity interest of VictorOps, Inc. (“VictorOps”), a privately-held Delaware corporation, that develops incident management solutions for the IT and DevOps markets. This acquisition has been accounted for as a business combination. The purchase price of $112.3 million , paid in cash of $108.8 million and $3.5 million in fair value of replacement equity awards attributable to pre-acquisition service, was preliminarily allocated as follows: $21.1 million to identified intangible assets, $1.7 million to net assets acquired, with the excess $89.5 million of the purchase price over the fair value of net tangible and intangible assets acquired recorded as goodwill, allocated to our one operating segment. Goodwill is primarily attributable to the value expected from the synergies of the combination, including combined selling opportunities with our products. This goodwill is not deductible for income tax purposes. The results of operations of VictorOps, which are not material, have been included in our condensed consolidated financial statements from the date of purchase. Additionally, we recognized $2.7 million of acquisition-related costs as general and administrative expense on our condensed consolidated statements of operations. Per the terms of the merger agreement with VictorOps, certain unvested stock options held by VictorOps employees were cancelled and exchanged for replacement stock options to purchase shares of our common stock under our 2012 Equity Incentive Plan. Additionally, certain shares of stock issued under share-based compensation awards held by key employees of VictorOps were cancelled and exchanged for unregistered restricted shares of our common stock subject to vesting. The portion of the fair value of the replacement equity awards associated with pre-acquisition service of VictorOps employees represented a component of the total purchase consideration, as discussed above. The remaining fair value of $7.6 million of these issued awards, which are subject to the recipients’ continued service with us and was excluded from the purchase price, will be recognized ratably as stock-based compensation expense over the required service period. We are still finalizing the allocation of the purchase price, which may be subject to change as additional information becomes available to us. The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands, except useful life): Fair Value Useful Life (months) Developed technology $ 11,700 84 Customer relationships 9,400 60 Total intangible assets acquired $ 21,100 Phantom On April 6, 2018, we acquired 100% of the voting equity interest of Phantom Cyber Corporation (“Phantom”), a privately-held Delaware corporation, that develops solutions for security orchestration, automation and response. This acquisition has been accounted for as a business combination. The purchase price of $303.8 million , paid in cash of $291.5 million and $12.3 million in fair value of replacement equity awards attributable to pre-acquisition service, was preliminarily allocated as follows: $44.1 million to identified intangible assets, $10.5 million to net assets acquired, $3.3 million to net deferred tax liability, with the excess $252.5 million of the purchase price over the fair value of net tangible and intangible assets acquired recorded as goodwill, allocated to our one operating segment. Goodwill is primarily attributable to the value expected from the synergies of the combination, including combined selling opportunities with our products. This goodwill is not deductible for income tax purposes. The results of operations of Phantom, which are not material, have been included in our condensed consolidated financial statements from the date of purchase. Additionally, we recognized $3.3 million of acquisition-related costs as general and administrative expense on our condensed consolidated statements of operations. Per the terms of the merger agreement with Phantom, certain shares of stock issued under share-based compensation awards held by key employees of Phantom were canceled and exchanged for replacement equity awards consisting of unregistered restricted shares of our common stock subject to vesting. The portion of the fair value of the replacement equity awards associated with pre-acquisition service of Phantom's key employees represented a component of the total purchase consideration, as discussed above. The remaining fair value of $62.2 million of these issued awards, which are subject to the recipients’ continued service with us and thus excluded from the purchase price, will be recognized ratably as stock-based compensation expense over the required service period. We are still finalizing the allocation of the purchase price, which may be subject to change as additional information becomes available to us. The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands, except useful life): Fair Value Useful Life (months) Developed technology $ 34,400 84 Customer relationships 9,700 60 Total intangible assets acquired $ 44,100 Unaudited Pro Forma Financial Information The following unaudited pro forma information presents the combined results of operations as if the acquisitions of VictorOps and Phantom had been completed on February 1, 2017, the beginning of the comparable prior annual reporting period. The unaudited pro forma results include adjustments primarily related to the following: (i) amortization associated with preliminary estimates for the acquired intangible assets; (ii) recognition of post-acquisition stock-based compensation; (iii) acquisition-related costs incurred prior to the acquisitions and (iv) the associated tax impact of the acquisitions and these unaudited pro forma adjustments. The unaudited pro forma results do not reflect any cost saving synergies from operating efficiencies or the effect of the incremental costs incurred from integrating these companies. Accordingly, these unaudited pro forma results are presented for informational purposes only and are not necessarily indicative of what the actual results of operations of the combined company would have been if the acquisitions had occurred at the beginning of the period presented, nor are they indicative of future results of operations (in thousands, except per share amounts): Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Revenue $ 389,283 $ 283,651 $ 708,561 $ 514,758 Net loss $ (103,945 ) $ (92,294 ) $ (234,407 ) $ (221,801 ) Basic and diluted net loss per share $ (0.72 ) $ (0.66 ) $ (1.62 ) $ (1.60 ) Rocana On October 6, 2017, we acquired certain assets of Rocana, Inc. (“Rocana”), a privately-held Delaware corporation that develops analytics solutions for the IT market. This acquisition has been accounted for as a business combination. The purchase price of $30.2 million , paid in cash, was preliminarily allocated as follows: $10.1 million to identifiable intangible assets, with the excess $20.1 million of the purchase price over the fair value of net assets acquired recorded as goodwill. This goodwill is primarily attributable to the value expected from the synergies of the combination, including advancing the analytics and machine learning capabilities of our products, and is deductible for income tax purposes. The results of operations of the acquired entity, which are not material, have been included in our condensed consolidated financial statements from the date of purchase. Pro forma and historical results of operations of the acquired entity have not been presented as we do not consider the results to have a material effect on any of the periods presented in our condensed consolidated statements of operations. We are currently finalizing the allocation of the purchase price, which may be subject to change as additional information becomes available to us. The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands, except useful life): Fair Value Useful Life (months) Developed technology $ 8,320 36 Other acquired intangible assets 1,790 24 Total intangible assets acquired $ 10,110 SignalSense On September 29, 2017, we acquired 100% of the voting equity interest of SignalSense Inc. (“SignalSense”), a privately held Washington corporation that develops cloud-based data collection and breach detection solutions that leverage machine learning. This acquisition has been accounted for as a business combination. The purchase price of $12.2 million , paid in cash, was preliminarily allocated as follows: $11.3 million to identifiable intangible assets acquired, $0.2 million in net assets and $2.0 million to net deferred tax liabilities, with the excess $2.7 million of the purchase price over the fair value of net assets acquired recorded as goodwill. This goodwill is primarily attributable to the value expected from the synergies of the combination, including developing more advanced cloud and machine learning capabilities for our products, and is not deductible for income tax purposes. The results of operations of the acquired entity, which are not material, have been included in our condensed consolidated financial statements from the date of purchase. Pro forma and historical results of operations of the acquired entity have not been presented as we do not consider the results to have a material effect on any of the periods presented in our condensed consolidated statements of operations. We are currently finalizing the allocation of the purchase price, which may be subject to change as additional information becomes available to us. The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands, except useful life): Fair Value Useful Life (months) Developed technology $ 11,310 36 Total intangible assets acquired $ 11,310 Drastin On May 15, 2017, we acquired 100% of the voting equity interest of Drastin, Inc. (“Drastin”), a privately-held Delaware corporation that develops technology for search-driven analytics on enterprise data. This acquisition has been accounted for as a business combination. The purchase price of $17.3 million , paid in cash, was allocated as follows: $3.8 million to identifiable intangible assets and $0.5 million to net deferred tax liability, with the excess $14.0 million of the purchase price over the fair value of net assets acquired recorded as goodwill. This goodwill is primarily attributable to the value expected from the synergies of the combination, including developing a more intuitive search experience for our products, and is not deductible for income tax purposes. The results of operations of the acquired entity, which are not material, have been included in our condensed consolidated financial statements from the date of purchase. Pro forma and historical results of operations of the acquired entity have not been presented as we do not consider the results to have a material effect on any of the periods presented in our condensed consolidated statements of operations. The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands, except useful life): Fair Value Useful Life (months) Developed technology $ 3,500 48 Other acquired intangible assets 300 24 Total intangible assets acquired $ 3,800 Goodwill There were no impairments to goodwill during the three or six months ended July 31, 2018 or during prior periods. Goodwill balances are presented below (in thousands): Carrying Amount Balance as of January 31, 2018 $ 161,382 Goodwill acquired 342,006 Balance as of July 31, 2018 $ 503,388 Intangible Assets Intangible assets subject to amortization realized from acquisitions as of July 31, 2018 are as follows (in thousands, except useful life): Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Useful Life (months) Developed technology $ 132,100 $ (45,758 ) $ 86,342 56 Customer relationships 20,910 (2,613 ) 18,297 58 Other acquired intangible assets 3,270 (2,044 ) 1,226 15 Total intangible assets subject to amortization $ 156,280 $ (50,415 ) $ 105,865 Amortization expense from acquired intangible assets was $6.3 million and $4.2 million for the three months ended July 31, 2018 and 2017 , respectively, and $11.0 million and $6.9 million for the six months ended July 31, 2018 and 2017 , respectively. The expected future amortization expense for acquired intangible assets as of July 31, 2018 is as follows (in thousands): Fiscal Period: Remaining six months of fiscal 2019 $ 14,282 Fiscal 2020 27,903 Fiscal 2021 23,780 Fiscal 2022 13,701 Fiscal 2023 10,406 Thereafter 15,793 Total amortization expense $ 105,865

Debt Financing Facilities

Debt Financing Facilities	6 Months Ended
	Jul. 31, 2018
Debt Disclosure [Abstract]
Debt Financing Facilities	Debt Financing Facilities On May 9, 2013, we entered into a Loan Agreement with Silicon Valley Bank, which was most recently amended in May 2018. As amended, the agreement provides for a revolving line of credit facility, which expires in May 2019. Under the agreement, we are able to borrow up to $25 million . Interest on any drawdown under the revolving line of credit accrues either at the prime rate ( 5.00% in July 2018 ) or the LIBOR rate plus 2.75% . As of July 31, 2018 , we had no balance outstanding under this agreement. The agreement contains customary financial covenants and other affirmative and negative covenants. We were in compliance with all covenants as of July 31, 2018 .

Stock Compensation Plans

Stock Compensation Plans	6 Months Ended
	Jul. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Compensation Plans	Stock Compensation Plans The following table summarizes our stock option, RSU and PSU award activity during the six months ended July 31, 2018 : Options Outstanding RSUs and PSUs Outstanding Shares Available for Grant Shares Weighted- Average Exercise Price Per Share Weighted- Average Remaining Contractual Term Aggregate Intrinsic Value (1) Shares (in years) (in thousands) Balances as of January 31, 2018 14,658,992 623,120 $ 8.22 3.68 $ 52,435 13,016,473 Additional shares authorized 7,141,756 Options granted (54,343 ) 54,343 22.71 Options exercised — (194,432 ) 6.96 19,283 Options forfeited and expired 99 (99 ) 15.27 RSUs and PSUs granted (2,554,121 ) 2,554,121 RSUs and PSUs vested — (2,396,505 ) Shares withheld related to net share settlement of RSUs and PSUs 39 — RSUs and PSUs forfeited and canceled 504,098 (504,098 ) Balances as of July 31, 2018 19,696,520 482,932 $ 10.36 3.92 $ 41,423 12,669,991 Vested and expected to vest 482,835 $ 10.35 3.92 $ 41,418 12,265,053 Exercisable as of July 31, 2018 428,260 $ 8.95 3.32 $ 37,322 _________________________ (1) The intrinsic value is calculated as the difference between the exercise price of the underlying stock option award and the closing market price of our common stock as of July 31, 2018 . Beginning in fiscal 2016, we have granted PSUs to certain executives under our 2012 Equity Incentive Plan. The number of PSUs earned and eligible to vest are determined based on achievement of certain performance conditions and/or market conditions and the recipients' continued service with us. For awards subject to service and performance conditions, the number of shares of our stock issued pursuant to the award can range from 0% to 200% of the target amount. For awards subject to service and performance conditions that also include market conditions, the number of shares of our stock issued pursuant to the award can range from 0% to 300% of the target amount. As of July 31, 2018 , total unrecognized compensation cost related to stock options was $4.4 million , adjusted for estimated forfeitures, which is expected to be recognized over a weighted-average period of 1.5 years . As of July 31, 2018 , total unrecognized compensation cost was $799.1 million related to RSUs, adjusted for estimated forfeitures, which is expected to be recognized over the next 2.7 years . As of July 31, 2018 , total unrecognized compensation cost was $57.9 million related to PSUs, adjusted for estimated forfeitures, which is expected to be recognized over the next 2.6 years . The weighted-average grant date fair value of RSUs granted was $110.60 per share during the six months ended July 31, 2018 . The weighted-average grant date fair value of PSUs granted was $86.55 per share during the six months ended July 31, 2018 . The following table summarizes our RSA activity during the six months ended July 31, 2018 : Shares Outstanding as of January 31, 2018 63,353 RSAs granted 824,605 RSAs vested (7,483 ) Outstanding as of July 31, 2018 880,475 The weighted-average grant date fair value of RSAs granted was $79.07 per share during the six months ended July 31, 2018 . As of July 31, 2018 , total unrecognized compensation cost related to RSAs was $61.8 million , adjusted for estimated forfeitures, which is expected to be recognized over the next 2.4 years .

Deferred Revenue and Performanc

Deferred Revenue and Performance Obligations	6 Months Ended
	Jul. 31, 2018
Revenue from Contract with Customer [Abstract]
Deferred Revenue and Performance Obligations	Deferred Revenue and Remaining Performance Obligations Deferred Revenue Revenues recognized from amounts included in deferred revenue as of January 31, 2018 were $279.2 million during the six months ended July 31, 2018. Revenues recognized during the six months ended July 31, 2018 from performance obligations satisfied or partially satisfied in previous periods were not material. Remaining Performance Obligations Revenue allocated to remaining performance obligations represents contracted revenue that has not yet been recognized, which includes deferred revenue and non-cancelable amounts that will be invoiced and excludes performance obligations that are subject to cancellation terms. Our remaining performance obligations were $841.2 million as of July 31, 2018 , of which we expect to recognize approximately 89% as revenue over the next 24 months and the remainder thereafter. Disaggregation of Revenues Refer to Note 9 “Geographic Information” for details regarding disclosures on the disaggregation of revenues.

Geographic Information

Geographic Information	6 Months Ended
	Jul. 31, 2018
Segment Reporting [Abstract]
Geographic Information	Geographic Information Revenues Revenues by geography are based on the shipping address of the customer. The following table presents our revenues by geographic region for the periods presented (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2018 2017* 2018 2017* United States $ 267,201 $ 199,573 $ 494,643 $ 362,036 International 121,102 80,651 205,299 144,956 Total revenues $ 388,303 $ 280,224 $ 699,942 $ 506,992 * Prior-period information has been adjusted to reflect the adoption of ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which we adopted on February 1, 2018. Refer to Note 1 for further details. Other than the United States, no other individual country exceeded 10% of total revenues during any of the periods presented. One channel partner represented 33% and 31% of total revenues during the three months ended July 31, 2018 and 2017 , respectively, and approximately 31% and 30% of total revenues during the six months ended July 31, 2018 and 2017 , respectively. A second channel partner represented approximately 16% and 19% of total revenues during the three months ended July 31, 2018 and 2017 , respectively, and approximately 15% and 18% of total revenues during the six months ended July 31, 2018 and 2017 , respectively. The revenues from these channel partners are comprised of a number of customer transactions, none of which were individually greater than 10% of total revenues for the three or six months ended July 31, 2018 or 2017 . As of July 31, 2018 , one channel partner represented 23% and a second channel partner represented 21% of total current and non-current accounts receivable. As of January 31, 2018 , one channel partner represented 39% and a second channel partner represented 10% of total current and non-current accounts receivable. Property and Equipment The following table presents our property and equipment, net of depreciation and amortization, by geographic region as of July 31, 2018 and January 31, 2018 (in thousands): As of July 31, 2018 January 31, 2018 United States $ 145,159 $ 153,335 International 11,250 7,545 Total property and equipment, net $ 156,409 $ 160,880 Other than the United States, no other country represented 10% or more of our total property and equipment as of July 31, 2018 or January 31, 2018 .

Income Taxes

Income Taxes	6 Months Ended
	Jul. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three months ended July 31, 2018 and 2017 , we recorded income tax expense of $0.8 million and $0.4 million , respectively. The increase in income tax expense for the three months ended July 31, 2018 was primarily due to an increase in taxable income from our international jurisdictions. For the six months ended July 31, 2018 and 2017 , we recorded an $1.2 million income tax benefit and an $1.7 million income tax expense, respectively. The decrease in income tax expense for the six months ended July 31, 2018 was primarily due to the partial release of the valuation allowance as a result of an acquisition. During the three months ended July 31, 2018 , there were no material changes to our unrecognized tax benefits. During fiscal year 2018, we recorded an increase to unrecognized tax benefits with an offset to the valuation allowance for $6.0 million relating to a change in accounting method for tax purposes. During the period ended April 30, 2018, we filed an application to formally change the accounting method with the IRS and received audit protection. As such, a reversal of the unrecognized tax benefits of $6.0 million was recorded with an offset to the valuation allowance during the period ended April 30, 2018. We do not expect to have other significant changes to unrecognized tax benefits through the end of fiscal year 2019. Because of our history of tax losses, all years remain open to tax audit. Tax Cuts and Jobs Act of 2017 In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (“SAB 118”), which allows us to record provisional amounts for the 2017 Tax Cuts and Jobs Act (the “Tax Act”) during a measurement period not to extend beyond one year of the enactment date, with further clarifications made recently with the issuance of ASU No. 2018-05 (Topic 740), Income Taxes: Amendments to SEC Paragraphs Pursuant to SEC SAB 118. Through July 31, 2018 , we did not have any significant adjustments to our provisional amounts. We will continue our analysis of these provisional amounts, which are still subject to change during the measurement period. We anticipate further guidance on accounting interpretations from the FASB and application of the law from the Department of Treasury. We expect to reach a final determination within the measurement period described above. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income ("GILTI"), states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred as a period expense. Given the complexity of the GILTI provisions, we are still evaluating the effects of the GILTI provisions and have not yet determined our accounting policy.

Net Loss Per Share

Net Loss Per Share	6 Months Ended
	Jul. 31, 2018
Earnings Per Share [Abstract]
Net Loss Per Share	Net Loss Per Share Basic net loss per share is computed by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less the weighted-average unvested common stock subject to repurchase or forfeiture. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including preferred stock, stock options, RSUs, PSUs and RSAs to the extent dilutive. The following table sets forth the computation of historical basic and diluted net loss per share for the periods presented (in thousands, except per share data): Three Months Ended July 31, Six Months Ended July 31, 2018 2017* 2018 2017* Numerator: Net loss $ (103,499 ) $ (78,593 ) $ (221,998 ) $ (193,717 ) Denominator: Weighted-average common shares outstanding 145,851 139,135 144,361 138,509 Less: Weighted-average unvested common shares subject to repurchase or forfeiture (821 ) (72 ) (55 ) (73 ) Weighted-average shares used to compute net loss per share, basic and diluted 145,030 139,063 144,306 138,436 Net loss per share, basic and diluted $ (0.71 ) $ (0.57 ) $ (1.54 ) $ (1.40 ) * Prior-period information has been adjusted to reflect the adoption of ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which we adopted on February 1, 2018. Refer to Note 1 for further details. Since we were in a net loss position for all periods presented, basic net loss per share is the same as diluted net loss per share for all periods as the inclusion of all potentially dilutive securities outstanding would have been anti-dilutive. Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands): As of July 31, 2018 2017 Shares subject to outstanding common stock options 483 1,483 Shares subject to outstanding RSUs, PSUs and RSAs 13,550 12,127 Employee stock purchase plan 371 344 Total 14,404 13,954

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jul. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Certain members of our board of directors serve on the board of directors of and/or are executive officers of, and, in some cases, are investors in, companies that are customers or vendors of ours. Certain of our executive officers also serve on the board of directors of companies that are customers or vendors of ours. All contracts with related parties are executed in the ordinary course of business. We recognized revenues from sales to these companies of $2.7 million and $2.9 million for the three months ended July 31, 2018 and 2017 , respectively, and $5.1 million and $5.9 million for the six months ended July 31, 2018 and 2017 , respectively. We recorded $0.8 million and $0.3 million in expenses related to purchases from these companies during the three months ended July 31, 2018 and 2017 , respectively, and $1.5 million and $0.5 million for the six months ended July 31, 2018 and 2017 , respectively. We had $1.6 million and $2.0 million of current and non-current accounts receivable from these companies as of July 31, 2018 and January 31, 2018 , respectively. We had $0.2 million and $0.3 million of accounts payable to these companies as of July 31, 2018 and January 31, 2018 , respectively.

Subsequent Event

Subsequent Event	6 Months Ended
	Jul. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On August 15, 2018, we entered into an office lease at 3060 Olsen Drive for approximately 301,000 square feet located in San Jose, California. This lease is expected to commence in the first quarter of fiscal 2020 for a term of 130 months, subject to the completion of certain pre-occupancy improvements by our landlord. Our total obligation for the base rent will be approximately $162.6 million .

Description of the Business a21

Description of the Business and Significant Accounting Policies (Policies)	6 Months Ended
	Jul. 31, 2018
Accounting Policies [Abstract]
Business Description and Basis of Presentation	Business Splunk Inc. (“we,” “us,” “our”) provides innovative software solutions that enable organizations to gain real-time operational intelligence by harnessing the value of their data. Our offerings enable users to collect, index, search, explore, monitor, correlate and analyze data regardless of format or source. Our offerings address large and diverse data sets commonly referred to as big data and are specifically tailored for machine data. Machine data is produced by nearly every software application and electronic device across an organization and contains a definitive, time-stamped record of various activities, such as transactions, customer and user behavior, and security threats. Our offerings help users derive new insights from machine data that can be used to, among other things, improve service levels, reduce operational costs, mitigate security risks, demonstrate and maintain compliance, and drive better business decisions. We were incorporated in California in October 2003 and reincorporated in Delaware in May 2006.
Fiscal Year	Fiscal Year Our fiscal year ends on January 31. References to fiscal 2019 or fiscal year 2019, for example, refer to the fiscal year ending January 31, 2019.
Basis of Presentation	Basis of Presentation Effective February 1, 2018, we adopted the Accounting Standards Update (ASU) No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” as discussed in “Recently Adopted Accounting Standards” below. Disclosures in this Quarterly Report on Form 10-Q have been updated to comply with the new standards, as indicated by the “As Adjusted” reference in these condensed consolidated financial statements and related notes. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated balance sheet data as of January 31, 2018 was derived from audited financial statements as adjusted to reflect the impact of the full retrospective adoption of Topic 606; but does not include all disclosures required by GAAP. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Annual Report on Form 10-K for the fiscal year ended January 31, 2018 , filed with the SEC on March 30, 2018 . In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to state 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 2019.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting periods covered by the financial statements and accompanying notes. In particular, we make estimates with respect to the stand-alone selling price for each distinct performance obligation included in customer contracts with multiple performance obligations, uncollectible accounts receivable, the assessment of the useful life and recoverability of long-lived assets (property and equipment, goodwill and identified intangibles), the period of benefit for deferred commissions, stock-based compensation expense, the fair value of assets acquired and liabilities assumed for business combinations, income taxes, leases and contingencies. Actual results could differ from those estimates.
Segments	Segments We operate our business as one operating segment: the development and marketing of software solutions that enable our customers to gain real-time operational intelligence by harnessing the value of their data. Our chief operating decision maker is our Chief Executive Officer, who reviews financial information presented on a consolidated basis for purposes of making operating decisions, assessing financial performance and allocating resources.
Principles of Consolidation	Principles of Consolidation The accompanying unaudited condensed consolidated financial statements include the accounts of Splunk Inc. and its direct and indirect wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated upon consolidation.
Revenue Recognition	Revenue Recognition We generate revenues primarily in the form of software license and related maintenance fees, cloud services and other services fees. Licenses for on-premises software are either perpetual or term licenses and provide the customer with a right to use the software, upon delivery to the customer. Typically, when purchasing a perpetual license, a customer also purchases one year of maintenance for which we charge a percentage of the license fee. When a term license is purchased, maintenance is bundled with the license for the term of the license period. Cloud services are provided on a subscription basis and give our customers access to our cloud solutions, which include related customer support. Other services include training and professional services that are not integral to the functionality of the licenses or cloud services. Revenue from on-premises licenses is recognized upfront upon transfer of control of the software, which occurs at delivery, or when the license term commences, if later. We recognize revenue from maintenance contracts ratably over the service period. Cloud services revenue is recognized ratably over the cloud service term. Training and professional services are provided either on a time and material basis, in which revenues are recognized as services are delivered, or over a contractual term, in which revenues are recognized ratably. With respect to contracts that include customer acceptance provisions, we recognize revenue upon customer acceptance. Our policy is to record revenues net of any applicable sales, use or excise taxes. Our contracts with customers often contain multiple performance obligations. For these contracts, we account for individual performance obligations separately if they are distinct. The transaction price is allocated to the separate performance obligations on a relative standalone selling price (“SSP”) basis. We determine the SSP based on an observable standalone selling price when it is available, as well as other factors, including, the price charged to customers, our discounting practices, and our overall pricing objectives, while maximizing observable inputs. In situations where pricing is highly variable or uncertain, we estimate the SSP using a residual approach. A receivable is recorded in the period we deliver products or provide services, or when we have an unconditional right to payment. Some of our multi-year on-premises license contracts are invoiced annually and we generally recognize the total amount of the license revenues upfront and record a corresponding receivable, if we have an unconditional right to receive payment. Current and non-current accounts receivable, net of allowance for doubtful accounts, was $281.6 million and $396.4 million as of July 31, 2018 and January 31, 2018, respectively. Payment terms and conditions vary by contract type, although our terms generally include a requirement of payment within 30 to 60 days. In instances where the timing of revenue recognition differs from the timing of payment, we have determined our contracts do not include a significant financing component. The primary purpose of our invoicing terms is to provide customers with simplified and predictable ways of purchasing our products and services, not to receive financing from our customers or to provide customers with financing. Deferred revenue is recorded when we invoice a contract prior to recognizing revenue. It is comprised mainly of balances related to maintenance and cloud services invoiced at the beginning of each service period. Deferred revenue also includes balances for training and professional services for which a payment has been received in advance of performance, as well as for licenses that we invoice and deliver prior to the license term commencing.
Deferred Sales Commissions	Deferred Sales Commissions Sales commissions paid to our sales force and the related payroll taxes are considered incremental and recoverable costs of obtaining a contract with a customer. These costs are capitalized and recorded in “Deferred commissions, current and non-current” in our condensed consolidated balance sheets. We generally amortize these costs over the remaining contractual term of our customer contracts, consistent with the pattern of revenue recognition of each performance obligation, for contracts in which the commissions paid on the initial and renewal contracts are commensurate. For certain contracts in which the commissions paid on the initial and renewal contracts are not commensurate, we amortize the commissions paid on the initial contract over an expected period of benefit, which we have determined to be approximately five years. We have determined the period of benefit by taking into consideration our customer contracts, the duration of our relationships with our customers and our technology. In capitalizing and amortizing deferred commissions, we have elected to apply a portfolio approach. We include amortization of deferred commissions in “Sales and marketing expense” in our condensed consolidated statements of operations. There were no impairments to deferred commissions for all periods presented.
Equity Investments	Equity Investments Equity investments without readily determinable fair values are accounted for at cost, less impairment and adjusted for subsequent observable price changes obtained from transactions for identical or similar investments issued by the same issuer. Changes in the basis of the equity investment will be recognized in “Other income (expense), net.” Investments in entities where we have the ability to exercise significant influence, but not control, over the investee are accounted for using the equity method of accounting. Our results of operations will include, as a component of “Other income (expense), net,” our share of the net income or loss of the equity investments accounted for under the equity method of accounting.
Stock-Based Compensation	Stock-Based Compensation We recognize compensation expense for all share-based payment awards, including stock options, restricted stock units (“RSUs”), performance units (“PSUs”) and restricted stock awards (“RSAs”), based on the estimated fair value of the award on the grant date over the related vesting periods. The expense recorded is based on awards ultimately expected to vest and therefore is reduced by estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We calculate the fair value of options using the Black-Scholes method and expense using the straight-line attribution approach. We account for equity awards issued to non-employees, such as consultants, in accordance with the guidance relating to equity instruments that are issued to other than employees for acquiring, or in conjunction with selling, goods or services, using the Black-Scholes method to determine the fair value of such instruments. Awards granted to non-employees are remeasured over the vesting period, and the resulting value is recorded as an expense over the period the services are received. The fair value of each option grant and stock purchase right granted under the Employee Stock Purchase Plan (“ESPP”) was estimated on the date of grant using the Black-Scholes option pricing model. We recognize stock-based compensation expense related to our ESPP on a straight-line basis over the offering period, which is twelve months. Stock-based compensation expense is recognized net of estimated forfeiture activity. The determination of the grant date fair value of options using an option-pricing model is affected by assumptions regarding a number of other complex and subjective variables, which include our expected stock price volatility over the expected term of the options, stock option exercise and cancellation behaviors, risk-free interest rates and expected dividends. The number of PSUs earned and eligible to vest are determined based on achievement of certain performance conditions and/or market conditions and the recipients' continued service with us. For awards subject to service and performance conditions, the number of shares of our stock issued pursuant to the award can range from 0% to 200% of the target amount. For awards subject to service and performance conditions that also include market conditions, the number of shares of our stock issued pursuant to the award can range from 0% to 300% of the target amount. Compensation expense for PSUs with performance conditions is measured using the fair value at the date of grant and recorded over the vesting period under the graded-vesting attribution method, and may be adjusted over the vesting period based on interim estimates of performance against the pre-set objectives. We use a Monte Carlo option-pricing model to determine the fair value of PSUs with market conditions.
New Accounting Pronouncements	Recently Adopted Accounting Standards In May 2017, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2017-09 (Topic 718), Scope of Modification Accounting. The new standard clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. We adopted this new standard as of February 1, 2018. The adoption of this new standard did not have an impact on our condensed consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-01 (Topic 805), Business Combinations - Clarifying the Definition of a Business. The new standard narrows the application of when an integrated set of assets and activities is considered a business and provides a framework to assist entities in evaluating whether both an input and a substantive process are present to be considered a business. We adopted this new standard as of February 1, 2018, and anticipate that the adoption of the new guidance will result in more transactions being accounted for as asset acquisitions rather than business combinations and that the new standard will impact our consideration of strategic investments. The adoption of this new standard did not have an impact on our condensed consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16 (Topic 740), Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory, which includes a revision of the accounting for the income tax consequences of intra-entity transfers of assets other than inventory to reduce the complexity in accounting standards. We adopted this new standard as of February 1, 2018 with an immaterial cumulative effect adjustment recorded in accumulated deficit as of February 1, 2018. In January 2016, the FASB issued ASU No. 2016-01 (Subtopic 825-10), Financial Instruments - Overall. The amendments in this update, and recent clarifications issued by the FASB through ASU No. 2018-03 and ASU No. 2018-04, address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments, and require equity securities to be measured at fair value with changes in fair value recognized through net income. We adopted this new standard as of February 1, 2018 on a prospective basis . As part of the adoption, we elected to apply the measurement alternative for our non-marketable equity investments that do not have readily determinable fair values, measuring them at cost, less any impairment, plus or minus adjustments resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. The adoption of these standards did not result in an adjustment for our non-marketable equity investments. In May 2014, the FASB issued ASU No. 2014-09 (Topic 606), Revenue from Contracts with Customers, which supersedes the revenue recognition requirements in Accounting Standards Codification 605, Revenue Recognition and establishes a new revenue standard. This new standard is based on the principle that revenue is recognized to depict the transfer of control of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The standard also requires additional disclosures about the nature, amount, timing and uncertainty of revenues and cash flows arising from customer contracts, including significant judgments and changes in judgments, and assets recognized from costs incurred to obtain or fulfill a contract. The FASB has also issued several amendments to the new standard which were designed to clarify and simplify the adoption process. In preparation for adoption of the new standard, we updated our accounting policies, systems, internal controls and processes. We adopted Topic 606 as of February 1, 2018 using the full retrospective method, which required us to adjust our historical financial information for fiscal years 2017 and 2018 to be consistent with the new standard. The most significant impacts of the standard relate to the timing of revenue recognition for arrangements involving term licenses, deferred revenue and sales commissions. Under the new revenue standard, we are required to recognize term license revenues upon the transfer of the license and the associated maintenance revenues over the contract period. Additionally, some deferred revenue, primarily from arrangements involving term licenses, was never recognized as revenue and instead is now a part of the cumulative effect adjustment within accumulated deficit. Finally, we are required to capitalize and amortize incremental costs of obtaining a contract, such as certain sales commission costs, over the remaining contractual term or over an expected period of benefit, which we have determined to be approximately five years. We applied the following practical expedients permitted under Topic 606. For all reporting periods presented before the date of initial adoption, we have elected not to disclose the amount of the transaction price allocated to the remaining performance obligations or provide an explanation of when we expect to recognize that amount as revenue. Additionally, we have also elected not to separately evaluate each contract modification that occurred before the initial adoption date. We have elected not to assess whether a contract has a significant financing component if we expect at contract inception that the period between payment and the transfer of products or services will be one year or less. The following tables present the impact of the new revenue standard to the reported results on our selected condensed consolidated statements of operations data and condensed consolidated balance sheet data and (in thousands, except per share data): Selected Condensed Consolidated Statements of Operations Data Three Months Ended July 31, 2017 As Reported Impact of Adoption As Adjusted Revenues License $ 142,851 $ 4,380 $ 147,231 Maintenance and services 137,113 (4,120 ) 132,993 Total revenues 279,964 260 280,224 Gross profit 220,088 260 220,348 Operating expenses Sales and marketing 191,284 (4,647 ) 186,637 Operating loss (82,109 ) 4,907 (77,202 ) Net loss $ (83,500 ) $ 4,907 $ (78,593 ) Basic and diluted net loss per share $ (0.60 ) $ 0.03 $ (0.57 ) Six Months Ended July 31, 2017 As Reported Impact of Adoption As Adjusted Revenues License $ 259,577 $ (9,784 ) $ 249,793 Maintenance and services 262,835 (5,636 ) 257,199 Total revenues 522,412 (15,420 ) 506,992 Gross profit 404,373 (15,420 ) 388,953 Operating expenses Sales and marketing 365,232 (5,134 ) 360,098 Operating loss (179,566 ) (10,286 ) (189,852 ) Net loss $ (183,431 ) $ (10,286 ) $ (193,717 ) Basic and diluted net loss per share $ (1.33 ) $ (0.07 ) $ (1.40 ) Selected Condensed Consolidated Balance Sheet Data January 31, 2018 As Reported Impact of Adoption As Adjusted Assets Accounts receivable, net $ 391,799 $ 4,614 $ 396,413 Deferred commissions, current — 52,451 52,451 Deferred commissions, non-current — 37,920 37,920 Liabilities and Stockholders’ Equity Accrued expenses and other liabilities 77,160 7,471 84,631 Deferred revenue, current 635,253 (145,340 ) 489,913 Deferred revenue, non-current 269,954 (91,162 ) 178,792 Accumulated deficit (1,279,887 ) 324,016 (955,871 ) The adoption of Topic 606 had no impact to cash provided by or used in operating, financing, or investing activities on our condensed consolidated statements of cash flows. Recently Issued Accounting Pronouncements In June 2018, the FASB issued ASU No. 2018-07 (Topic 718), Compensation - Stock Compensation: Improvements to Nonemployee Share-Based Payment Accounting. Under the new standard, entities will no longer be required to value non-employee share-based payment awards differently from employee awards. Upon transition, entities are required to measure non-employee awards at their grant-date fair value as of the adoption date. The standard is effective for our first quarter of fiscal 2020, although early adoption is permitted. We do not expect this standard will have a material impact on our condensed consolidated financial statements upon adoption. In June 2016, the FASB issued ASU No. 2016-13 (Topic 326), Financial Instruments - Credit Losses. The amendments in this update require a financial asset (or a group of financial assets) measured at an amortized cost basis to be presented at the net amount expected to be collected. The new approach to estimating credit losses (referred to as the current expected credit losses model) applies to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loans and held-to-maturity debt securities. The standard is effective for our first quarter of fiscal 2021, although early adoption is permitted. We are currently evaluating whether the adoption of this standard will have a material impact on our condensed consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02 (Topic 842), Leases, which supersedes the lease recognition requirements in ASC Topic 840, Leases. The standard requires an entity to recognize right-of-use assets and lease liabilities arising from a lease for operating leases, initially measured at the present value of the lease payments on the condensed consolidated balance sheets. The impact of such leases on the condensed consolidated statements of operations and cash flows will continue to be treated in a similar manner under current GAAP. The standard also requires additional qualitative and quantitative disclosures. In July 2018, the FASB issued ASU No. 2018-10, Codification Improvements to Topic 842, Leases, which clarifies the codification or corrects unintended application of the guidance. In addition, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, which provides an optional transition method to apply the new lease standard at the adoption date, as opposed to the beginning of the earliest year presented, and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The standard is effective for our first quarter of fiscal 2020, although early adoption is permitted. We are currently evaluating the impact of this standard on our condensed consolidated financial statements and related disclosures. We anticipate that most of our office leases will be recognized as lease liabilities and corresponding right-of-use assets, and will accordingly have a material impact on our condensed consolidated balance sheets upon adoption.

Description of the Business a22

Description of the Business and Significant Accounting Policies Description of the Business and Significant Accounting Policies (Tables)	6 Months Ended
	Jul. 31, 2018
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following tables present the impact of the new revenue standard to the reported results on our selected condensed consolidated statements of operations data and condensed consolidated balance sheet data and (in thousands, except per share data): Selected Condensed Consolidated Statements of Operations Data Three Months Ended July 31, 2017 As Reported Impact of Adoption As Adjusted Revenues License $ 142,851 $ 4,380 $ 147,231 Maintenance and services 137,113 (4,120 ) 132,993 Total revenues 279,964 260 280,224 Gross profit 220,088 260 220,348 Operating expenses Sales and marketing 191,284 (4,647 ) 186,637 Operating loss (82,109 ) 4,907 (77,202 ) Net loss $ (83,500 ) $ 4,907 $ (78,593 ) Basic and diluted net loss per share $ (0.60 ) $ 0.03 $ (0.57 ) Six Months Ended July 31, 2017 As Reported Impact of Adoption As Adjusted Revenues License $ 259,577 $ (9,784 ) $ 249,793 Maintenance and services 262,835 (5,636 ) 257,199 Total revenues 522,412 (15,420 ) 506,992 Gross profit 404,373 (15,420 ) 388,953 Operating expenses Sales and marketing 365,232 (5,134 ) 360,098 Operating loss (179,566 ) (10,286 ) (189,852 ) Net loss $ (183,431 ) $ (10,286 ) $ (193,717 ) Basic and diluted net loss per share $ (1.33 ) $ (0.07 ) $ (1.40 ) Selected Condensed Consolidated Balance Sheet Data January 31, 2018 As Reported Impact of Adoption As Adjusted Assets Accounts receivable, net $ 391,799 $ 4,614 $ 396,413 Deferred commissions, current — 52,451 52,451 Deferred commissions, non-current — 37,920 37,920 Liabilities and Stockholders’ Equity Accrued expenses and other liabilities 77,160 7,471 84,631 Deferred revenue, current 635,253 (145,340 ) 489,913 Deferred revenue, non-current 269,954 (91,162 ) 178,792 Accumulated deficit (1,279,887 ) 324,016 (955,871 )

Investments and Fair Value Me23

Investments and Fair Value Measurements (Tables)	6 Months Ended
	Jul. 31, 2018
Investments, Debt And Equity Securities And Fair Value Disclosures [Abstract]
Schedule of fair value of financial assets and liabilities that were measured on a recurring basis	The following table sets forth the fair value of our financial assets that were measured on a recurring basis as of July 31, 2018 and January 31, 2018 (in thousands): July 31, 2018 January 31, 2018 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets: Money market funds $ 368,655 $ — $ — $ 368,655 $ 341,687 $ — $ — $ 341,687 U.S. treasury securities — 471,902 — 471,902 — 619,203 — 619,203 Other — — 4,000 4,000 — — — — Reported as: Assets: Cash and cash equivalents $ 368,655 $ 341,687 Investments, current 471,902 619,203 Investments, non-current 4,000 — Total $ 844,557 $ 960,890
Schedule of available-for-sale securities reconciliation	The following table represents our investments in U.S. treasury securities, which we have classified as available-for-sale investments as of July 31, 2018 (in thousands): July 31, 2018 Amortized Cost Unrealized Gains Unrealized Losses Fair Value Investments, current: U.S. treasury securities $ 472,338 $ — $ (436 ) $ 471,902 Total available-for-sale investments in U.S. treasury securities $ 472,338 $ — $ (436 ) $ 471,902 The following table represents our investments in U.S. treasury securities, which we have classified as available-for-sale investments as of January 31, 2018 (in thousands): January 31, 2018 Amortized Cost Unrealized Gains Unrealized Losses Fair Value Investments, current: U.S. treasury securities $ 620,345 $ — $ (1,142 ) $ 619,203 Total available-for-sale investments in U.S. treasury securities $ 620,345 $ — $ (1,142 ) $ 619,203
Schedule of unrealized loss on investments	As of July 31, 2018 , and January 31, 2018 , the following marketable securities were in an unrealized loss position (in thousands): Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses July 31, 2018 U.S. treasury securities $ 471,902 $ (436 ) $ — $ — $ 471,902 $ (436 ) January 31, 2018 U.S. treasury securities $ 619,203 $ (1,142 ) $ — $ — $ 619,203 $ (1,142 )
Investments classified by contractual maturity date	The contractual maturities of our investments are as follows (in thousands): July 31, 2018 Due within one year $ 471,902 Total $ 471,902
Schedule of equity investments	Our equity investments are reported in “Investments, non-current” on our condensed consolidated balance sheets. The following table provides a summary of our equity investments as of July 31, 2018 and January 31, 2018 (in thousands): July 31, 2018 January 31, 2018 Equity investments without readily determinable fair values $ 5,000 $ 5,000 Equity investments under the equity method of accounting 750 375 Total $ 5,750 $ 5,375

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jul. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	The following summarizes our operating lease commitments as of July 31, 2018 (in thousands): Payments Due by Period Total Less Than 1 1-3 years 3-5 years More Than 5 Operating lease commitments (1) $ 293,571 $ 27,431 $ 60,900 $ 54,512 $ 150,728 _________________________ (1) We have entered into sublease agreements for portions of our office space and the future rental income of $6.2 million from these agreements has been included as an offset to our future minimum rental payments.
Schedule of Future Minimum Lease Payments for Financing Lease Obligation	As of July 31, 2018 , future payments on the financing lease obligation are as follows (in thousands): Fiscal Period: Remaining six months of fiscal 2019 $ 6,288 Fiscal 2020 12,928 Fiscal 2021 13,316 Fiscal 2022 13,715 Fiscal 2023 14,127 Thereafter 8,142 Total future minimum lease payments $ 68,516

Property and Equipment (Tables)

Property and Equipment (Tables)	6 Months Ended
	Jul. 31, 2018
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and equipment consisted of the following as of July 31, 2018 and January 31, 2018 (in thousands): As of July 31, 2018 January 31, 2018 Computer equipment and software $ 73,842 $ 69,457 Furniture and fixtures 18,251 18,090 Leasehold and building improvements (1) 70,853 67,348 Building (2) 82,250 82,250 Property and equipment, gross 245,196 237,145 Less: accumulated depreciation and amortization (88,787 ) (76,265 ) Property and equipment, net $ 156,409 $ 160,880 _________________________ (1) Includes costs related to assets not yet placed into service of $7.2 million and $2.8 million , as of July 31, 2018 and January 31, 2018, respectively. (2) This relates to the capitalization of construction costs in connection with our financing lease obligation, where we are considered the owner of the asset, for accounting purposes only. There is a corresponding long-term liability for this obligation on our condensed consolidated balance sheets under “Other liabilities, non-current.” Refer to Note 3 “Commitments and Contingencies” for details.

Acquisitions, Goodwill and In26

Acquisitions, Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jul. 31, 2018
Goodwill [Line Items]
Schedule of pro forma information of business acquisitions	Accordingly, these unaudited pro forma results are presented for informational purposes only and are not necessarily indicative of what the actual results of operations of the combined company would have been if the acquisitions had occurred at the beginning of the period presented, nor are they indicative of future results of operations (in thousands, except per share amounts): Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Revenue $ 389,283 $ 283,651 $ 708,561 $ 514,758 Net loss $ (103,945 ) $ (92,294 ) $ (234,407 ) $ (221,801 ) Basic and diluted net loss per share $ (0.72 ) $ (0.66 ) $ (1.62 ) $ (1.60 )
Schedule of goodwill	Carrying Amount Balance as of January 31, 2018 $ 161,382 Goodwill acquired 342,006 Balance as of July 31, 2018 $ 503,388
Schedule of finite-lived intangible assets	Intangible assets subject to amortization realized from acquisitions as of July 31, 2018 are as follows (in thousands, except useful life): Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Useful Life (months) Developed technology $ 132,100 $ (45,758 ) $ 86,342 56 Customer relationships 20,910 (2,613 ) 18,297 58 Other acquired intangible assets 3,270 (2,044 ) 1,226 15 Total intangible assets subject to amortization $ 156,280 $ (50,415 ) $ 105,865
Schedule of expected future amortization for capitalized computer software costs developed for internal use	The expected future amortization expense for acquired intangible assets as of July 31, 2018 is as follows (in thousands): Fiscal Period: Remaining six months of fiscal 2019 $ 14,282 Fiscal 2020 27,903 Fiscal 2021 23,780 Fiscal 2022 13,701 Fiscal 2023 10,406 Thereafter 15,793 Total amortization expense $ 105,865
VictorOps
Goodwill [Line Items]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination	The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands, except useful life): Fair Value Useful Life (months) Developed technology $ 11,700 84 Customer relationships 9,400 60 Total intangible assets acquired $ 21,100
Drastin, Inc.
Goodwill [Line Items]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination	The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands, except useful life): Fair Value Useful Life (months) Developed technology $ 3,500 48 Other acquired intangible assets 300 24 Total intangible assets acquired $ 3,800
Phantom Cyber Corporation
Goodwill [Line Items]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination	The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands, except useful life): Fair Value Useful Life (months) Developed technology $ 34,400 84 Customer relationships 9,700 60 Total intangible assets acquired $ 44,100
Rocana, Inc.
Goodwill [Line Items]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination	The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands, except useful life): Fair Value Useful Life (months) Developed technology $ 8,320 36 Other acquired intangible assets 1,790 24 Total intangible assets acquired $ 10,110
SignalSense, Inc.
Goodwill [Line Items]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination	The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the date of acquisition (in thousands, except useful life): Fair Value Useful Life (months) Developed technology $ 11,310 36 Total intangible assets acquired $ 11,310

Stock Compensation Plans (Table

Stock Compensation Plans (Tables)	6 Months Ended
	Jul. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share Based Compensation Stock Options and Restricted Stock Units Award Activity	The following table summarizes our stock option, RSU and PSU award activity during the six months ended July 31, 2018 : Options Outstanding RSUs and PSUs Outstanding Shares Available for Grant Shares Weighted- Average Exercise Price Per Share Weighted- Average Remaining Contractual Term Aggregate Intrinsic Value (1) Shares (in years) (in thousands) Balances as of January 31, 2018 14,658,992 623,120 $ 8.22 3.68 $ 52,435 13,016,473 Additional shares authorized 7,141,756 Options granted (54,343 ) 54,343 22.71 Options exercised — (194,432 ) 6.96 19,283 Options forfeited and expired 99 (99 ) 15.27 RSUs and PSUs granted (2,554,121 ) 2,554,121 RSUs and PSUs vested — (2,396,505 ) Shares withheld related to net share settlement of RSUs and PSUs 39 — RSUs and PSUs forfeited and canceled 504,098 (504,098 ) Balances as of July 31, 2018 19,696,520 482,932 $ 10.36 3.92 $ 41,423 12,669,991 Vested and expected to vest 482,835 $ 10.35 3.92 $ 41,418 12,265,053 Exercisable as of July 31, 2018 428,260 $ 8.95 3.32 $ 37,322 _________________________ (1) The intrinsic value is calculated as the difference between the exercise price of the underlying stock option award and the closing market price of our common stock as of July 31, 2018 .
Schedule of Other Share-based Compensation, RSAs	The following table summarizes our RSA activity during the six months ended July 31, 2018 : Shares Outstanding as of January 31, 2018 63,353 RSAs granted 824,605 RSAs vested (7,483 ) Outstanding as of July 31, 2018 880,475

Geographic Information (Tables)

Geographic Information (Tables)	6 Months Ended
	Jul. 31, 2018
Segment Reporting [Abstract]
Schedule of revenues by geographic region	Revenues by geography are based on the shipping address of the customer. The following table presents our revenues by geographic region for the periods presented (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2018 2017* 2018 2017* United States $ 267,201 $ 199,573 $ 494,643 $ 362,036 International 121,102 80,651 205,299 144,956 Total revenues $ 388,303 $ 280,224 $ 699,942 $ 506,992 * Prior-period information has been adjusted to reflect the adoption of ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which we adopted on February 1, 2018. Refer to Note 1 for further details.
Schedule of property and equipment	The following table presents our property and equipment, net of depreciation and amortization, by geographic region as of July 31, 2018 and January 31, 2018 (in thousands): As of July 31, 2018 January 31, 2018 United States $ 145,159 $ 153,335 International 11,250 7,545 Total property and equipment, net $ 156,409 $ 160,880

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	6 Months Ended
	Jul. 31, 2018
Earnings Per Share [Abstract]
Schedule of computation of historical basic and diluted net loss per share	The following table sets forth the computation of historical basic and diluted net loss per share for the periods presented (in thousands, except per share data): Three Months Ended July 31, Six Months Ended July 31, 2018 2017* 2018 2017* Numerator: Net loss $ (103,499 ) $ (78,593 ) $ (221,998 ) $ (193,717 ) Denominator: Weighted-average common shares outstanding 145,851 139,135 144,361 138,509 Less: Weighted-average unvested common shares subject to repurchase or forfeiture (821 ) (72 ) (55 ) (73 ) Weighted-average shares used to compute net loss per share, basic and diluted 145,030 139,063 144,306 138,436 Net loss per share, basic and diluted $ (0.71 ) $ (0.57 ) $ (1.54 ) $ (1.40 )
Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive	Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands): As of July 31, 2018 2017 Shares subject to outstanding common stock options 483 1,483 Shares subject to outstanding RSUs, PSUs and RSAs 13,550 12,127 Employee stock purchase plan 371 344 Total 14,404 13,954

Description of the Business a30

Description of the Business and Significant Accounting Policies (Details)	6 Months Ended
	Jul. 31, 2018segment
Accounting Policies [Abstract]
Number of operating segments	1

Description of the Business a31

Description of the Business and Significant Accounting Policies - Impact of New Revenue Standard on Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Financial Statement Line Item
License		$ 200,668	$ 147,231	$ 339,643	$ 249,793
Maintenance and services		187,635	132,993	360,299	257,199
Total revenues		388,303	280,224	699,942	506,992
Gross profit		304,555	220,348	538,224	388,953
Sales and marketing	[1]	243,830	186,637	461,866	360,098
Operating loss		(103,858)	(77,202)	(225,324)	(189,852)
Net loss		$ (103,499)	$ (78,593)	$ (221,998)	$ (193,717)
Basic and diluted (in dollars per share)		$ (0.71)	$ (0.57)	$ (1.54)	$ (1.40)
As Reported
Financial Statement Line Item
License			$ 142,851		$ 259,577
Maintenance and services			137,113		262,835
Total revenues			279,964		522,412
Gross profit			220,088		404,373
Sales and marketing			191,284		365,232
Operating loss			(82,109)		(179,566)
Net loss			$ (83,500)		$ (183,431)
Basic and diluted (in dollars per share)			$ (0.60)		$ (1.33)
Accounting Standards Update 2014-09 | Impact of Adoption
Financial Statement Line Item
License			$ 4,380		$ (9,784)
Maintenance and services			(4,120)		(5,636)
Total revenues			260		(15,420)
Gross profit			260		(15,420)
Sales and marketing			(4,647)		(5,134)
Operating loss			4,907		(10,286)
Net loss			$ 4,907		$ (10,286)
Basic and diluted (in dollars per share)			$ 0.03		$ (0.07)
[1]	Amounts include stock-based compensation expense for the three months ended July 31, 2018 and 2017 as follows: Cost of revenues, $8,947 thousand and $8,410 thousand; Research and development, $33,597 thousand and $25,991 thousand; Sales and marketing, $45,546 thousand and $42,652 thousand; General and administrative, $16,953 thousand and $15,314 thousand Stock-based compensation expense for the six months ended July 31, 2018 and 2017 as follows: Cost of revenues, $17,751 thousand and $16,602 thousand; Research and development, $60,013 thousand and $52,788 thousand; Sales and marketing, $88,593 thousand and $83,295 thousand; General and administrative, $33,307 thousand and $29,737 thousand

Description of the Business a32

Description of the Business and Significant Accounting Policies - Impact of New Revenue Standard on Balance Sheet (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Financial Statement Line Item
Accounts receivable, net	$ 247,827	$ 396,413
Deferred commissions, current	57,419	52,451
Deferred commissions, non-current	43,435	37,920
Accrued expenses and other liabilities	99,251	84,631
Deferred revenue, current	494,610	489,913
Deferred revenue, non-current	166,976	178,792
Accumulated deficit	$ (1,178,465)	(955,871)
As Reported
Financial Statement Line Item
Accounts receivable, net		391,799
Deferred commissions, current		0
Deferred commissions, non-current		0
Accrued expenses and other liabilities		77,160
Deferred revenue, current		635,253
Deferred revenue, non-current		269,954
Accumulated deficit		(1,279,887)
Accounting Standards Update 2014-09 | Impact of Adoption
Financial Statement Line Item
Accounts receivable, net		4,614
Deferred commissions, current		52,451
Deferred commissions, non-current		37,920
Accrued expenses and other liabilities		7,471
Deferred revenue, current		(145,340)
Deferred revenue, non-current		(91,162)
Accumulated deficit		$ 324,016

Description of the Business a33

Description of the Business and Significant Accounting Policies Description of the Business and Significant Accounting Policies Metrics (Details)	6 Months Ended
	Jul. 31, 2018
Minimum | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights	0.00%
Minimum | PSUs with market conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights	0.00%
Maximum | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights	200.00%
Maximum | PSUs with market conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights	300.00%

Description of the Business a34

Description of the Business and Significant Accounting Policies Description of the Business and Significant Accounting Policies Metrics 2 (Details) - USD ($) $ in Millions	Jul. 31, 2018	Jan. 31, 2018
Receivables [Abstract]
Accounts Receivable, Net	$ 281.6	$ 396.4

Investments and Fair Value Me35

Investments and Fair Value Measurements (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Fair Value Measurements
Investments, non-current	$ 9,750	$ 5,375
U.S. treasury securities	471,902
Estimate of Fair Value Measurement | Recurring basis
Fair Value Measurements
Money market funds	368,655	341,687
U.S. treasury securities	471,902	619,203
Other	4,000	0
Assets:
Cash and cash equivalents	368,655	341,687
Investments, current	471,902	619,203
Investments, non-current	4,000	0
Total	844,557	960,890
Estimate of Fair Value Measurement | Recurring basis | Level 1
Fair Value Measurements
Money market funds	368,655	341,687
U.S. treasury securities	0	0
Other	0	0
Estimate of Fair Value Measurement | Recurring basis | Level 2
Fair Value Measurements
Money market funds	0	0
U.S. treasury securities	471,902	619,203
Other	0	0
Estimate of Fair Value Measurement | Recurring basis | Level 3
Fair Value Measurements
Money market funds	0	0
U.S. treasury securities	0	0
Other	$ 4,000	$ 0

Investments and Fair Value Me36

Investments and Fair Value Measurements - Amortized Cost to Fair Value Reconciliation (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
U.S. treasury securities, Fair Value	$ 471,902
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
U.S. treasury securities, Amortized Cost	472,338	$ 620,345
U.S. treasury securities, Unrealized Gains	0	0
U.S. treasury securities, Unrealized Losses	(436)	(1,142)
U.S. treasury securities, Fair Value	471,902	619,203
US Treasury Securities | Investments, Current
Schedule of Available-for-sale Securities [Line Items]
U.S. treasury securities, Amortized Cost	472,338	620,345
U.S. treasury securities, Unrealized Gains	0	0
U.S. treasury securities, Unrealized Losses	(436)	(1,142)
U.S. treasury securities, Fair Value	$ 471,902	$ 619,203

Investments and Fair Value Me37

Investments and Fair Value Measurements - Securities in Unrealized Loss Position (Details) - US Treasury Securities - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Fair Value
Less than 12 Months	$ 471,902	$ 619,203
12 Months or Greater	0	0
Total	471,902	619,203
Unrealized Losses
Less than 12 Months	(436)	(1,142)
12 Months or Greater	0	0
Total	$ (436)	$ (1,142)

Investments and Fair Value Me38

Investments and Fair Value Measurements - Contractual Maturities (Details) $ in Thousands	Jul. 31, 2018USD ($)
Investments, Debt And Equity Securities And Fair Value Disclosures [Abstract]
Due within one year	$ 471,902
Total	$ 471,902

Investments and Fair Value Me39

Investments and Fair Value Measurements - Equity Investments (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Investments, Debt And Equity Securities And Fair Value Disclosures [Abstract]
Equity investments without readily determinable fair values	$ 5,000	$ 5,000
Equity investments under the equity method of accounting	750	375
Total	$ 5,750	$ 5,375

Commitments and Contingencies40

Commitments and Contingencies (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Rent expense		$ 6,100	$ 5,500	$ 12,200	$ 10,800
Base Rent Obligation	[1]	293,571		293,571
Operating lease obligations, Less than 1 year	[1]	27,431		27,431
Operating lease obligations, 1-3 years	[1]	60,900		60,900
Operating lease obligations, 3-5 years	[1]	54,512		54,512
Operating lease obligations, More than 5 years	[1]	150,728		150,728
Future sublease rental income		$ 6,200		$ 6,200
[1]	We have entered into sublease agreements for portions of our office space and the future rental income of $6.2 million from these agreements has been included as an offset to our future minimum rental payments.

Commitments and Contingencies -

Commitments and Contingencies - Office Lease (Details) ft² in Thousands, $ in Thousands		Jun. 18, 2018USD ($)ft²	Apr. 29, 2014USD ($)ft²	Jul. 31, 2018USD ($)	Jul. 31, 2017USD ($)	Jul. 31, 2018USD ($)	Jul. 31, 2017USD ($)	May 13, 2014USD ($)
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense, Net				$ 6,100	$ 5,500	$ 12,200	$ 10,800
Base Rent Obligation				68,516		68,516
Base Rent Obligation	[1]			$ 293,571		$ 293,571
San Francisco, CA , 270 Brannan Street - Initial Premises [Member]
Operating Leased Assets [Line Items]
Area of Real Estate Property | ft²		101
Term of office lease		147 months
Base Rent Obligation		$ 137,600
San Francisco, CA , 270 Brannan Street [Member]
Operating Leased Assets [Line Items]
Area of Real Estate Property | ft²			182
Term of office lease			84 months
Base Rent Obligation			$ 92,000
Amount to be Maintained in Letter of Credit as Security for Lease Agreement								$ 6,000
[1]	We have entered into sublease agreements for portions of our office space and the future rental income of $6.2 million from these agreements has been included as an offset to our future minimum rental payments.

Commitments and Contingencies42

Commitments and Contingencies - Capital Leases (Details) ft² in Thousands, $ in Thousands	Apr. 29, 2014USD ($)ft²	Jul. 31, 2018USD ($)	May 13, 2014USD ($)
Lessee, Lease, Description [Line Items]
Remaining six months of fiscal 2019		$ 6,288
Fiscal 2,020		12,928
Fiscal 2,021		13,316
Fiscal 2,022		13,715
Fiscal 2,023		14,127
Thereafter		8,142
Base Rent Obligation		$ 68,516
San Francisco, CA , 270 Brannan Street [Member]
Lessee, Lease, Description [Line Items]
Area of Real Estate Property | ft²	182
Term of office lease	84 months
Amount to be Maintained in Letter of Credit as Security for Lease Agreement			$ 6,000
Base Rent Obligation	$ 92,000
Initial Premises
Lessee, Lease, Description [Line Items]
Area of Real Estate Property | ft²	91
Additional Premises
Lessee, Lease, Description [Line Items]
Area of Real Estate Property | ft²	91

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense on Property and Equipment, net	$ 6,500	$ 6,600	$ 13,100	$ 13,000
Property and equipment, gross	245,196		245,196		$ 237,145
Less: accumulated depreciation and amortization	(88,787)		(88,787)		(76,265)
Property and equipment, net	156,409		156,409		160,880
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	73,842		73,842		69,457
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	18,251		18,251		18,090
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	70,853		70,853		67,348
Leasehold improvements not in service
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,200		7,200		2,800
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 82,250		$ 82,250		$ 82,250

Acquisitions, Goodwill and In44

Acquisitions, Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	Jun. 22, 2018	Apr. 06, 2018	Oct. 06, 2017	Sep. 29, 2017	May 15, 2017	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2018
Business Acquisition [Line Items]
Goodwill						$ 503,388		$ 503,388		$ 161,382
Amortization of intangible assets						$ 6,300	$ 4,200	11,000	$ 6,900
VictorOps
Business Acquisition [Line Items]
Percentage of voting interests acquired	100.00%
Purchase price	$ 112,300
Purchase price paid in cash	108,800
Purchase price paid in fair value of replacement equity awards	3,500
Acquired fair value of finite-lived intangible assets	21,100
Net assets acquired	1,700
Goodwill	89,500
Acquisition-related costs								2,700
Replacement equity awards	7,600
Phantom Cyber Corporation
Business Acquisition [Line Items]
Percentage of voting interests acquired		100.00%
Purchase price		$ 303,800
Purchase price paid in cash		291,500
Purchase price paid in fair value of replacement equity awards		12,300
Acquired fair value of finite-lived intangible assets		44,100
Net assets acquired		10,500
Goodwill		252,500
Acquisition-related costs								$ 3,300
Replacement equity awards		62,200
Net deferred tax liabilities assumed		3,300
Rocana, Inc.
Business Acquisition [Line Items]
Purchase price paid in cash			$ 30,200
Acquired fair value of finite-lived intangible assets			10,110
Goodwill			20,100
SignalSense, Inc.
Business Acquisition [Line Items]
Percentage of voting interests acquired				100.00%
Purchase price paid in cash				$ 12,200
Acquired fair value of finite-lived intangible assets				11,310
Net assets acquired				200
Goodwill				2,700
Net deferred tax liabilities assumed				2,000
Drastin Inc.
Business Acquisition [Line Items]
Percentage of voting interests acquired					100.00%
Purchase price paid in cash					$ 17,300
Acquired fair value of finite-lived intangible assets					3,800
Goodwill					14,000
Deferred tax liability					500
Developed technology
Business Acquisition [Line Items]
Weighted Average Remaining Useful Life								56 months
Developed technology | VictorOps
Business Acquisition [Line Items]
Acquired fair value of finite-lived intangible assets	$ 11,700
Weighted Average Remaining Useful Life	84 months
Developed technology | Phantom Cyber Corporation
Business Acquisition [Line Items]
Acquired fair value of finite-lived intangible assets		$ 34,400
Weighted Average Remaining Useful Life		84 months
Developed technology | Rocana, Inc.
Business Acquisition [Line Items]
Acquired fair value of finite-lived intangible assets			$ 8,320
Weighted Average Remaining Useful Life			36 months
Developed technology | SignalSense, Inc.
Business Acquisition [Line Items]
Acquired fair value of finite-lived intangible assets				$ 11,310
Weighted Average Remaining Useful Life				36 months
Developed technology | Drastin Inc.
Business Acquisition [Line Items]
Acquired fair value of finite-lived intangible assets					$ 3,500
Weighted Average Remaining Useful Life					48 months
Other acquired intangible assets
Business Acquisition [Line Items]
Weighted Average Remaining Useful Life								15 months
Other acquired intangible assets | VictorOps
Business Acquisition [Line Items]
Acquired fair value of finite-lived intangible assets	$ 9,400
Weighted Average Remaining Useful Life	60 months
Other acquired intangible assets | Phantom Cyber Corporation
Business Acquisition [Line Items]
Acquired fair value of finite-lived intangible assets		$ 9,700
Weighted Average Remaining Useful Life		60 months
Other acquired intangible assets | Rocana, Inc.
Business Acquisition [Line Items]
Acquired fair value of finite-lived intangible assets			$ 1,790
Weighted Average Remaining Useful Life			24 months
Other acquired intangible assets | Drastin Inc.
Business Acquisition [Line Items]
Acquired fair value of finite-lived intangible assets					$ 300
Weighted Average Remaining Useful Life					24 months

Acquisitions, Goodwill and In45

Acquisitions, Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 22, 2018	Apr. 06, 2018	Oct. 06, 2017	Sep. 29, 2017	May 15, 2017	Jul. 31, 2018
Developed technology
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Weighted Average Remaining Useful Life						56 months
Customer relationships
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Weighted Average Remaining Useful Life						58 months
Other acquired intangible assets
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Weighted Average Remaining Useful Life						15 months
VictorOps
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets	$ 21,100
VictorOps | Developed technology
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets	$ 11,700
Weighted Average Remaining Useful Life	84 months
VictorOps | Other acquired intangible assets
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets	$ 9,400
Weighted Average Remaining Useful Life	60 months
Phantom Cyber Corporation
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets		$ 44,100
Phantom Cyber Corporation | Developed technology
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets		$ 34,400
Weighted Average Remaining Useful Life		84 months
Phantom Cyber Corporation | Other acquired intangible assets
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets		$ 9,700
Weighted Average Remaining Useful Life		60 months
Rocana, Inc.
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets			$ 10,110
Rocana, Inc. | Developed technology
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets			$ 8,320
Weighted Average Remaining Useful Life			36 months
Rocana, Inc. | Other acquired intangible assets
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets			$ 1,790
Weighted Average Remaining Useful Life			24 months
SignalSense, Inc.
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets				$ 11,310
SignalSense, Inc. | Developed technology
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets				$ 11,310
Weighted Average Remaining Useful Life				36 months
Drastin Inc.
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets					$ 3,800
Drastin Inc. | Developed technology
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets					$ 3,500
Weighted Average Remaining Useful Life					48 months
Drastin Inc. | Other acquired intangible assets
Finite-Lived and Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Acquired fair value of finite-lived intangible assets					$ 300
Weighted Average Remaining Useful Life					24 months

Acquisitions, Goodwill and In46

Acquisitions, Goodwill and Intangible Assets (Details 1) - Phantom Cyber Corporation - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Business Acquisition [Line Items]
Revenues	$ 389,283	$ 283,651	$ 708,561	$ 514,758
Net loss	$ (103,945)	$ (92,294)	$ (234,407)	$ (221,801)
Basic and diluted net loss per share (in usd per share)	$ (0.72)	$ (0.66)	$ (1.62)	$ (1.60)

Acquisitions, Goodwill and In47

Acquisitions, Goodwill and Intangible Assets (Details 2) $ in Thousands	6 Months Ended
	Jul. 31, 2018USD ($)
Goodwill [Roll Forward]
Balance as of January 31, 2018	$ 161,382
Goodwill acquired	342,006
Balance as of July 31, 2018	$ 503,388

Acquisitions, Goodwill and In48

Acquisitions, Goodwill and Intangible Assets (Details 3) $ in Thousands	6 Months Ended
	Jul. 31, 2018USD ($)
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 156,280
Accumulated Amortization	(50,415)
Total	105,865
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	132,100
Accumulated Amortization	(45,758)
Total	$ 86,342
Weighted Average Remaining Useful Life	56 months
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 20,910
Accumulated Amortization	(2,613)
Total	$ 18,297
Weighted Average Remaining Useful Life	58 months
Other acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 3,270
Accumulated Amortization	(2,044)
Total	$ 1,226
Weighted Average Remaining Useful Life	15 months

Acquisitions, Goodwill and In49

Acquisitions, Goodwill and Intangible Assets (Details 4) $ in Thousands	Jul. 31, 2018USD ($)
Business Combinations [Abstract]
Remaining six months of fiscal 2019	$ 14,282
Fiscal 2,020	27,903
Fiscal 2,021	23,780
Fiscal 2,022	13,701
Fiscal 2,023	10,406
Thereafter	15,793
Total	$ 105,865

Debt Financing Facilities (Deta

Debt Financing Facilities (Details) - Revolving line of credit facility - USD ($)	6 Months Ended
	Jul. 31, 2018	May 09, 2013
Debt Financing Facilities
Maximum borrowing capacity		$ 25,000,000
Prime rate	5.00%
Amount outstanding	$ 0
London Interbank Offered Rate (LIBOR)
Debt Financing Facilities
Basis spread on variable rate	2.75%

Stock Compensation Plans (Detai

Stock Compensation Plans (Details)	6 Months Ended
	Jul. 31, 2018shares
Available for Grant
Balances at the beginning of the period (in shares)	14,658,992
Additional Shares Authorized (in shares)	7,141,756
Options granted (in shares)	(54,343)
Options forfeited and expired (in shares)	99
Shares granted	2,554,121
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Withheld Related to Share Settlement	39
Equity other than options forfeited (in shares)	504,098
Balances at the end of the period (in shares)	19,696,520

Stock Compensation Plans (Det52

Stock Compensation Plans (Details 2) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	6 Months Ended	12 Months Ended
		Jul. 31, 2018	Jul. 31, 2018	Jan. 31, 2018
Shares
Options granted (in shares)			54,343
Options forfeited and expired (in shares)			(99)
Number of Shares
Shares granted			2,554,121
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Withheld Related to Share Settlement			39
Equity other than options forfeited (in shares)			(504,098)
Options
Shares
Outstanding at the beginning of the period (in shares)			623,120
Options granted (in shares)			54,343
Options exercised (in shares)			(194,432)
Options forfeited and expired (in shares)			(99)
Outstanding at the end of the period (in shares)				623,120
Vested and expected to vest at the end of the period (in shares)		482,835	482,835
Exercisable at the end of the period (in shares)		428,260	428,260
Weighted-Average Exercise Price Per Share
Balances at the beginning of the period (in dollars per share)			$ 8.22
Options granted (in dollars per share)			22.71
Options exercised (in dollars per share)			6.96
Options forfeited (in dollars per share)			15.27
Balances at the end of the period (in dollars per share)		$ 10.36	10.36	$ 8.22
Vested and expected to vest at the end of the period (in dollars per share)		10.35	10.35
Exercisable at the end of the period (in dollars per share)		$ 8.95	$ 8.95
Weighted-Average Remaining Contractual Term
Balances at the end of the period			3 years 11 months 1 day	3 years 8 months 5 days
Vested and expected to vest at the end of the period			3 years 11 months 1 day
Vested and exercisable at the end of the period			3 years 3 months 26 days
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	[1]	$ 41,423	$ 41,423	$ 52,435
Vested and expected to vest at the end of the period (in dollars)	[1]	41,418	41,418
Vested and exercisable at the end of the period (in dollars)	[1]	37,322	37,322
Unrecognized compensation cost
Total unrecognized compensation cost related to stock options		$ 4,400	4,400
Weighted-average period over which unrecognized compensation cost is expected to be recognized		1 year 6 months
Additional disclosures
Total intrinsic value of options exercised (in dollars)			$ 19,283
RSUs and PSUs
Number of Shares
Balances at the beginning of the period (in shares)			13,016,473
Shares granted			2,554,121
Equity other than options vested (in shares)			(2,396,505)
Equity other than options forfeited (in shares)			(504,098)
Balances at the end of the period (in shares)		12,669,991	12,669,991	13,016,473
RSUs vested and expected to vest at the end of the period (in shares)		12,265,053	12,265,053
Unrecognized compensation cost
Weighted-average period over which unrecognized compensation cost is expected to be recognized		2 years 8 months 12 days
Total unrecognized compensation cost		$ 799,100	$ 799,100
Additional disclosures
Weighted-average grant date fair value of awards granted (in dollars per share)			$ 110.60
PSUs
Unrecognized compensation cost
Weighted-average period over which unrecognized compensation cost is expected to be recognized			2 years 7 months 6 days
Total unrecognized compensation cost		$ 57,900	$ 57,900
Additional disclosures
Weighted-average grant date fair value of awards granted (in dollars per share)			$ 86.55
RSAs
Number of Shares
Balances at the beginning of the period (in shares)			63,353
Shares granted			824,605
Equity other than options vested (in shares)			(7,483)
Balances at the end of the period (in shares)		880,475	880,475	63,353
Unrecognized compensation cost
Weighted-average period over which unrecognized compensation cost is expected to be recognized		2 years 4 months 24 days
Total unrecognized compensation cost		$ 61,800	$ 61,800
Additional disclosures
Weighted-average grant date fair value of awards granted (in dollars per share)			$ 79.07
Minimum | PSUs
Tax benefits
Award vesting rights			0.00%
Minimum | PSUs with market conditions
Tax benefits
Award vesting rights			0.00%
Maximum | PSUs
Tax benefits
Award vesting rights			200.00%
Maximum | PSUs with market conditions
Tax benefits
Award vesting rights			300.00%
[1]	The intrinsic value is calculated as the difference between the exercise price of the underlying stock option award and the closing market price of our common stock as of July 31, 2018.

Deferred Revenue and Performa53

Deferred Revenue and Performance Obligations - Remaining Performance Obligations (Details) $ in Millions	6 Months Ended
	Jul. 31, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Remaining performance obligations	$ 841.2
Remaining performance obligations, percentage recognized	89.00%
Remaining performance obligation, expected timing of recognition	24 months

Deferred Revenue and Performa54

Deferred Revenue and Performance Obligations - Deferred Revenue (Details) $ in Millions	6 Months Ended
	Jul. 31, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Recognition of deferred revenue from opening deferred balance	$ 279.2

Geographic Information Narrativ

Geographic Information Narrative (Details) - customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2018
Customer concentration risk | Accounts receivable
Concentration Risk [Line Items]
Number of customers accounting for 10 percent or more of the AR concentration risk	2		2		2
Customer concentration risk | Revenues
Concentration Risk [Line Items]
Number of customers accounting for 10 percent or more of the revenue concentration risk	2	2	2	2
Geographic concentration | Property and equipment | United States
Concentration Risk [Line Items]
Concentration risk, percentage			10.00%		10.00%
Customer One | Customer concentration risk | Accounts receivable
Concentration Risk [Line Items]
Concentration risk, percentage			23.00%		39.00%
Customer One | Customer concentration risk | Revenues
Concentration Risk [Line Items]
Concentration risk, percentage	33.00%	31.00%	31.00%	30.00%
Customer Two [Member] | Customer concentration risk | Accounts receivable
Concentration Risk [Line Items]
Concentration risk, percentage			21.00%		10.00%
Customer Two [Member] | Customer concentration risk | Revenues
Concentration Risk [Line Items]
Concentration risk, percentage	16.00%	19.00%	15.00%	18.00%

Geographic Information (Details

Geographic Information (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2018
Concentration Risk [Line Items]
Revenues	$ 388,303	$ 280,224	$ 699,942	$ 506,992
Property and Equipment by Geographic Area
Property and equipment	156,409		156,409		$ 160,880
United States
Concentration Risk [Line Items]
Revenues	267,201	199,573	494,643	362,036
Property and Equipment by Geographic Area
Property and equipment	145,159		145,159		153,335
International
Concentration Risk [Line Items]
Revenues	121,102	$ 80,651	205,299	$ 144,956
Property and Equipment by Geographic Area
Property and equipment	$ 11,250		$ 11,250		$ 7,545

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Income Tax Disclosure [Abstract]
Income tax provision (benefit)	$ 811	$ 353	$ (1,177)	$ 1,691
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	$ 6,000

Net Loss Per Share (Details)

Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Numerator
Net loss	$ (103,499)	$ (78,593)	$ (221,998)	$ (193,717)
Denominator:
Weighted-average common shares outstanding (in shares)	145,851	139,135	144,361	138,509
Less: Weighted-average unvested common shares subject to repurchase or forfeiture (in shares)	(821)	(72)	(55)	(73)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	145,030	139,063	144,306	138,436
Net loss per share
Net loss per share, basic and diluted (in dollars per share)	$ (0.71)	$ (0.57)	$ (1.54)	$ (1.40)

Net Loss Per Share (Details 2)

Net Loss Per Share (Details 2) - shares shares in Thousands	6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Potentially dilutive securities
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	14,404	13,954
Shares subject to outstanding common stock options
Potentially dilutive securities
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	483	1,483
Shares subject to outstanding RSUs, PSUs and RSAs
Potentially dilutive securities
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	13,550	12,127
Employee stock purchase plan
Potentially dilutive securities
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	371	344

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2018
Related Party Transactions [Abstract]
Revenue from sales to the related party	$ 2.7	$ 2.9	$ 5.1	$ 5.9
Expenses related to purchases from the related party	0.8	$ 0.3	1.5	$ 0.5
Accounts receivable from the related party	1.6		1.6		$ 2
Accounts Payable, Related Parties	$ 0.2		$ 0.2		$ 0.3

Subsequent Event (Details)

Subsequent Event (Details) $ in Thousands		Aug. 15, 2018USD ($)ft²	Jul. 31, 2018USD ($)
Subsequent Event [Line Items]
Base Rent Obligation	[1]		$ 293,571
Subsequent Event [Member]
Subsequent Event [Line Items]
Area of Real Estate Property | ft²		301,000
Term of office lease		130 months
Base Rent Obligation		$ 162,600
[1]	We have entered into sublease agreements for portions of our office space and the future rental income of $6.2 million from these agreements has been included as an offset to our future minimum rental payments.