Box (BOX) 10-Q 7 Sep 18 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jul. 31, 2018	Aug. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2018
Document Fiscal Year Focus	2,019
Document Fiscal Period Focus	Q2
Trading Symbol	BOX
Entity Registrant Name	BOX INC
Entity Central Index Key	1,372,612
Current Fiscal Year End Date	--01-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		141,610,389

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Jul. 31, 2018	Jan. 31, 2018
Current assets:
Cash and cash equivalents		$ 203,726	$ 208,076
Accounts receivable, net of allowance of $2,324 and $1,856	[1]	114,779	162,133
Prepaid expenses and other current assets		16,459	11,391
Deferred commissions		16,855	17,589
Total current assets		351,819	399,189
Property and equipment, net		125,357	123,977
Intangible assets, net			24
Goodwill		18,740	16,293
Restricted cash		238	350
Deferred commissions, non-current		44,059	8,330	[2]
Other long-term assets		5,211	5,403
Total assets		545,424	553,566
Current liabilities:
Accounts payable		12,960	17,036
Accrued compensation and benefits		25,506	37,707
Accrued expenses and other current liabilities		24,818	26,198
Capital lease obligations		21,341	18,844
Deferred revenue		281,765	291,902
Deferred rent		2,947	2,280
Total current liabilities		369,337	393,967
Debt, non-current		40,000	40,000
Capital lease obligations, non-current		31,777	26,980
Deferred revenue, non-current		19,752	29,021
Deferred rent, non-current		45,552	45,882
Other long-term liabilities		3,879	2,748
Total liabilities		510,297	538,598
Commitments and contingencies (Note 7)
Stockholders’ equity:
Common stock		14	13
Additional paid-in capital		1,110,296	1,054,932
Treasury stock		(1,177)	(1,177)
Accumulated other comprehensive income		2	288
Accumulated deficit		(1,074,008)	(1,039,088)
Total stockholders’ equity		35,127	14,968
Total liabilities and stockholders’ equity		$ 545,424	$ 553,566
[1]	Contract assets are reported as part of accounts receivable upon the adoption of ASC Topic 606.
[2]	As of January 31, 2018, deferred commissions, non-current was reported as part of other long-term assets. The condensed consolidated balance sheet as of January 31, 2018 was reclassified to conform to the current period presentation.

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Statement Of Financial Position [Abstract]
Allowance for accounts receivable	$ 2,324	$ 1,856

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Income Statement [Abstract]
Revenue	$ 148,222	$ 122,941	$ 288,729	$ 240,163
Cost of revenue	42,605	32,778	81,673	65,501
Gross profit	105,617	90,163	207,056	174,662
Operating expenses:
Research and development	41,830	34,042	80,078	67,576
Sales and marketing	76,984	73,271	153,982	143,934
General and administrative	24,022	21,846	46,075	42,127
Total operating expenses	142,836	129,159	280,135	253,637
Loss from operations	(37,219)	(38,996)	(73,079)	(78,975)
Interest expense, net	(91)	(236)	(161)	(515)
Other (loss) income, net	(579)	267	(922)	283
Loss before provision for income taxes	(37,889)	(38,965)	(74,162)	(79,207)
Provision for income taxes	196	320	560	164
Net loss	$ (38,085)	$ (39,285)	$ (74,722)	$ (79,371)
Net loss per common share, basic and diluted	$ (0.27)	$ (0.30)	$ (0.54)	$ (0.60)
Weighted-average shares used to compute net loss per share, basic and diluted	140,718	132,981	139,639	132,237

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (38,085)	$ (39,285)	$ (74,722)	$ (79,371)
Changes in foreign currency translation adjustment	[1]	(162)	149	(286)	178
Comprehensive loss		$ (38,247)	$ (39,136)	$ (75,008)	$ (79,193)
[1]	Tax effect was not material

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended			12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017		Jul. 31, 2018	Jul. 31, 2017		Jan. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (38,085)	$ (39,285)		$ (74,722)	$ (79,371)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	11,849	9,765		23,244	19,337
Stock-based compensation expense	30,683	24,067		57,296	47,013
Amortization of deferred commissions	4,040	5,368		7,715	10,358
Other	26	19		5	41
Changes in operating assets and liabilities:
Accounts receivable, net	(23,754)	(25,124)		47,936	12,222
Deferred commissions	(8,588)	(5,835)		(13,304)	(8,619)
Prepaid expenses and other assets	267	(3,402)	[1]	(4,933)	(5,943)	[1]
Accounts payable	(1,680)	(121)		(1,205)	7,061
Accrued expenses and other liabilities	9,113	7,074		(15,604)	(3,893)
Deferred rent	294	1,189		337	1,719
Deferred revenue	14,568	16,524		(9,592)	(1,145)
Net cash (used in) provided by operating activities	(1,267)	(9,761)	[1]	17,173	(1,220)	[1]
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(3,326)	(1,013)		(7,366)	(1,797)
Proceeds from sale of property and equipment		2		1	29
Acquisitions	(458)			(458)
Net cash used in investing activities	(3,784)	(1,011)		(7,823)	(1,768)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	9,469	2,957		12,831	5,413
Proceeds from issuances of common stock under employee stock purchase plan				11,846	8,881
Employee payroll taxes paid related to net share settlement of restricted stock units	(12,010)	(5,821)		(25,305)	(14,935)
Acquisition related contingent consideration		(991)			(991)
Payments of capital lease obligations	(5,752)	(4,176)		(12,902)	(7,912)
Net cash used in financing activities	(8,293)	(8,031)		(13,530)	(9,544)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(158)	149		(282)	178
Net decrease in cash, cash equivalents, and restricted cash	(13,502)	(18,654)	[1]	(4,462)	(12,354)	[1]
Cash, cash equivalents, and restricted cash, beginning of period	217,466	210,472		208,426	204,172		$ 204,172
Cash, cash equivalents, and restricted cash, end of period	203,964	191,818		203,964	191,818		208,426
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest, net of amounts capitalized	587	466		1,172	889
Cash paid for income taxes, net of tax refunds	131	188		992	733
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Change in accrued equipment purchases	391	2,054		(2,177)	890
Purchases of property and equipment under capital lease	8,465	5,972		18,521	15,681
Change in unpaid tax related to capital lease	150	200		235	435
Issuance of common stock in connection with acquisitions	1,053			1,053
Contingent consideration accruals in connection with acquisitions	936			936
Timing of settlement of stock options exercise	(1,007)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH INFORMATION:
Cash and cash equivalents, beginning of period	217,116	183,691		208,076	177,391		177,391
Restricted cash, beginning of period	350	26,781		350	26,781		26,781
Cash, cash equivalents, and restricted cash, beginning of period	217,466	210,472		208,426	204,172		204,172
Cash and cash equivalents, end of period	203,726	165,275		203,726	165,275		208,076
Restricted cash, end of period	238	26,543		238	26,543		350
Cash, cash equivalents, and restricted cash, end of period	$ 203,964	$ 191,818		$ 203,964	$ 191,818		$ 208,426
[1]	Adjusted due to the adoption of ASU 2016-18

Description of Business and Bas

Description of Business and Basis of Presentation	6 Months Ended
	Jul. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Note 1. Description of Business and Basis of Presentation Description of Business We were incorporated in the state of Washington in April 2005, and were reincorporated in the state of Delaware in March 2008. We changed our name from Box.Net, Inc. to Box, Inc. in November 2011. Box provides a leading cloud content management platform that enables organizations of all sizes to securely manage cloud content while allowing easy, secure access and sharing of this content from anywhere, on any device. Basis of Presentation The accompanying condensed consolidated balance sheet as of July 31, 2018 and the condensed consolidated statements of operations, the condensed consolidated statements of comprehensive loss and the condensed consolidated statements of cash flows for the three and six months ended July 31, 2018 and 2017, respectively, are unaudited. The condensed consolidated balance sheet data as of January 31, 2018 was derived from the audited consolidated financial statements that are included in our Annual Report on Form 10-K for the fiscal year ended January 31, 2018 (the “Form 10-K”), which was filed with the Securities and Exchange Commission (the “SEC”) on March 22, 2018. The accompanying statements should be read in conjunction with the audited consolidated financial statements and related notes contained in our Form 10-K. Other than items discussed under Recently Adopted Accounting Pronouncements and Summary of Significant Accounting Policies , there have been no other material changes to our critical accounting policies and estimates during the six months ended July 31, 2018 from those disclosed in Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Form 10-K. The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information. Accordingly, they do not include all of the financial information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of our management, the unaudited condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements in the Form 10-K, and include all adjustments necessary for the fair presentation of our balance sheet as of July 31, 2018, and our results of operations, including our comprehensive loss, and our cash flows for the three and six months ended July 31, 2018 and 2017. All adjustments are of a normal recurring nature. The results for the three and six months ended July 31, 2018 are not necessarily indicative of the results to be expected for any subsequent quarter or for the fiscal year ending January 31, 2019. Certain prior period amounts reported in our condensed consolidated financial statements and notes thereto have been reclassified to conform to the current year presentation. Such reclassifications did not affect total revenues, operating income, or net income. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make, on an ongoing basis, estimates and assumptions that affect the amounts reported and disclosed in the financial statements and the accompanying notes. Actual results could differ from these estimates. Such estimates include, but are not limited to, the determination of the allowance for accounts receivable, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, estimate of standalone selling price allocation included in contracts with multiple performance obligations, the estimated expected benefit period for deferred commissions, observable price changes of , Certain Risks and Concentrations Our financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, restricted cash, and accounts receivable. Although we deposit our cash with multiple financial institutions, our deposits, at times, may exceed deposit insurance coverage limits. We sell to a broad range of customers, including resellers. Our revenue is derived substantially from the United States across a multitude of industries. Accounts receivable are derived from the delivery of our services to customers primarily located in the United States. We accept and settle our accounts receivable using credit cards, electronic payments and checks. A majority of our lower dollar value invoices are settled by credit card on or near the date of the invoice. We do not require collateral from customers to secure accounts receivable. We maintain an allowance for doubtful accounts based upon the expected collectability, which takes into consideration specific customer creditworthiness and current economic trends. We believe collections of our accounts receivable are reasonably assured based on the size, industry diversification, financial condition and past transaction history of our customers. As of July 31, 2018, no single customer, including resellers, represented over 10% of total accounts receivable. As of January 31, 2018, one reseller, which is also a customer, accounted for more than 10% of total accounts receivable. One reseller, which is also a customer, represented over 10% of revenue for the three and six months ended July 31, 2018. No single customer represented over 10% of revenue for the three and six months ended July 31, 2017. We serve our customers and users from datacenter facilities operated by third parties. In order to reduce the risk of down time of our subscription services, we have established datacenters and third-party cloud computing and hosting providers in various locations in the United States and abroad. We have internal procedures to restore services in the event of disaster at any one of our current datacenter facilities. Even with these procedures for disaster recovery in place, our cloud services could be significantly interrupted during the implementation of the procedures to restore services. Geographic Locations For the three and six months ended July 31, 2018, revenue attributable to customers in the United States and customers outside the United States was 76% and 24%, respectively. For the three and six months ended July 31, 2017, revenue attributable to customers in the United States and customers outside the United States was 79% and 21%, respectively. No other country outside of the United States comprised 10% or greater of our revenue for any of the periods presented. Substantially all of our net assets are located in the United States. As of July 31, 2018 and January 31, 2018, property and equipment located in the United States was 91% and 95%, respectively. Recently Adopted Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09 and its related amendments regarding Accounting Standards Codification Topic 606 (ASC Topic 606), Revenue from Contracts with Customers Adoption Impact of ASC Topic 606 on the Opening Balance Sheet as of February 1, 2018 Under ASC Topic 606, there is a change in the timing of revenue recognition for certain sales contracts primarily due to the removal of the contingent revenue limitation pursuant to ASC Topic 605. Under ASC Topic 606, we capitalize costs based on the definition of incremental costs of obtaining a contract and commence amortization upon the transfer of services to the customer. Such costs are generally amortized over five years, which represents a longer period over which we had previously amortized, in order to align to an estimated expected benefit period under ASC Topic 606. Additionally, the scope of costs capitalized under ASC Topic 606 is significantly broader than the scope prior to ASC Topic 606, resulting in additional costs being capitalized. The adoption of ASC Topic 606 had no impact on our cash flows from operations. The following table summarizes the adjustments made to account on the condensed consolidated balance sheet as of February 1, 2018 as a result of applying the modified retrospective method to adopt ASC Topic 606 (in thousands): As Reported Adjustments As Adjusted January 31, 2018 Revenue Recognition Incremental Costs of Obtaining a Contract February 1, 2018 Accounts receivable* $ 162,133 $ 582 $ 162,715 Deferred commissions 17,589 $ (3,449 ) 14,140 Deferred commissions, non-current** 8,330 32,855 41,185 Deferred revenue 291,902 (8,483 ) 283,419 Deferred revenue, non-current 29,021 (1,331 ) 27,690 Accumulated deficit (1,039,088 ) 10,396 29,406 (999,286 ) * Contract assets are reported as part of accounts receivable upon the adoption of ASC Topic 606. ** As of January 31, 2018, deferred commissions, non-current was reported as part of other long-term assets. The condensed consolidated balance sheet as of January 31, 2018 was reclassified to conform to the current period presentation. The decrease of deferred revenue and increase to deferred commissions as of February 1, 2018 resulted in additional deferred tax liabilities that reduced our net deferred tax asset position. The net deferred tax assets in the jurisdictions impacted by the adoption of ASC Topic 606 were fully reserved and, accordingly, this impact was offset by a corresponding reduction to the valuation allowance with no resulting net impact to our net assets or accumulated deficit. In addition, the adoption of the ASC Topic 606 resulted in changes to our accounting estimates and policies for revenue recognition, deferred commissions, deferred revenue, and accounts receivable and related allowance. Please see Summary of Significant Accounting Policies for a discussion of our updated policies. Ongoing ASC Topic 606 Financial Statement Impact as of and for the three and six months ended July 31, 2018 Refer to “ Note 2. Revenue ” for the ongoing ASC Topic 606 impact on the condensed consolidated financial statement line items as of and for the three and six months ended July 31, 2018. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows: Restricted Cash Three Months Ended July 31, 2017 Six Months Ended July 31, 2017 As Reported Adjustments As Adjusted As Reported Adjustments As Adjusted Changes in operating assets and liabilities: Prepaid expenses and other assets, current and noncurrent* $ (3,164 ) $ (238 ) $ (3,402 ) $ (5,705 ) $ (238 ) $ (5,943 ) Net cash used in operating activities (9,523 ) (238 ) (9,761 ) (982 ) (238 ) (1,220 ) Net decrease in cash, cash equivalents, and restricted cash (18,416 ) (238 ) (18,654 ) (12,116 ) (238 ) (12,354 ) Cash, cash equivalents, and restricted cash, beginning of period 183,691 26,781 210,472 177,391 26,781 204,172 Cash, cash equivalents, and restricted cash, end of period 165,275 26,543 191,818 165,275 26,543 191,818 * Changes in restricted cash were included as part of prepaid expenses and other assets, current and noncurrent. In January 2016, the FASB issued ASU 2016-01, Financial Instruments (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities Technical Corrections and Improvements to Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. In addition, the adoption of the ASU 2016-01 and 2018-03 resulted in changes to our accounting policies for fair value of financial instruments. Please see Summary of Significant Accounting Policies for a discussion of our updated policies. In June 2018, the FASB issued ASU 2018-07, Compensation – Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting In October 2016, the FASB issued ASU 2016-16, Accounting for Income Taxes: Intra-Entity Asset Transfers of Assets Other than Inventory, related to the accounting for income tax effects on intra-entity asset transfers of assets other than inventory. The new guidance requires reporting entities to recognize tax expense from the sale of assets when the transfer occurs, even though the pre-tax effects of the transaction are eliminated in consolidation. We adopted ASU 2016-16 in the first quarter of fiscal year 2019 on a modified retrospective basis. The adoption did not result in a material impact on our condensed consolidated financial statements. Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, Leases Note 7. Commitments and Contingencies In June 2016, the FASB issued ASU 2016-13, Financial Instruments- Credit Losses Summary of Significant Accounting Policies Except for the accounting policies for revenue recognition, deferred commissions, deferred revenue, accounts receivable and related allowance, and fair value of financial instruments Summary of Significant Accounting Policies Revenue Recognition We derive our revenue primarily from three sources: (1) subscription revenue, which is comprised of subscription fees from customers who have access to our cloud content management platform and other subscription-based services, which all include routine customer support; (2) revenue from customers purchasing our premier services package; and (3) revenue from professional services such as implementing best practice use cases, project management and implementation consulting services. Revenue is recognized when control of these services are transferred to a customer. The amount of revenue recognized reflects the consideration we expect to be entitled to in exchange for those services. We determine revenue recognition through the following steps: • Identification of the contract, or contracts, with a customer • Identification of the performance obligations in the contract • Determination of the transaction price • Allocation of the transaction price to the performance obligations in the contract • Recognition of revenue when, or as we, satisfy a performance obligation Subscription and Premier Services Revenues Subscription and premier services revenue are generally recognized on a ratable basis over the contract term beginning on the date that our service is made available to the customer. We typically invoice our customers at the beginning of the term, in multiyear, annual, quarterly or monthly installments. Our subscription and premier services contracts generally range from one to three years in length, are typically non-cancellable and do not contain refund-type provisions. Revenue is presented net of sales and other taxes we collect on behalf of governmental authorities. Professional Services Professional services are generally billed on a fixed price basis, for which revenue is recognized over time based on the proportion performed. Contracts with Multiple Performance Obligations Our contracts can include multiple performance obligations which may consist of some or all of subscription services, premier services, and professional services. 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 basis. We determine the standalone selling prices based on our overall pricing objectives, taking into consideration discounting practices, the size and volume of our transactions, the customer demographic, the geographic area where services are sold, price lists, our go-to-market strategy, historical standalone sales and contract prices. Deferred Commissions Sales commissions earned by our sales force are considered incremental and recoverable costs of obtaining a contract with a customer. Sales commissions for new contracts are deferred and then amortized on a straight-line basis over a period of benefit that we have estimated to be five years. We determined the period of benefit by taking into consideration our customer contracts, our technology and other factors. Sales commissions for renewal contracts are deferred and then amortized on a straight-line basis over the related contractual renewal period. Amortization expense is included in sales and marketing expenses on the condensed consolidated statements of operations. We apply the practical expedient in ASC Topic 606 to expense costs as incurred for sales commissions when the amortization period would have been one year or less. Deferred Revenue Deferred revenue consists of billings and payments received in advance of revenue recognition generated by our subscription services, premier services, and professional services described above. ASC Topic 606 introduced the concept of contract liabilities, which is substantially similar to deferred revenue under previous accounting guidance. Accounts Receivable and Related Allowance Accounts receivable are recorded at the invoiced amounts and do not bear interest. We maintain an allowance for estimated losses inherent in our accounts receivable portfolio. We assess the collectability of the accounts by taking into consideration the aging of our trade receivables, historical experience, and management judgment. We write off trade receivables against the allowance when management determines a balance is uncollectible and no longer intends to actively pursue collection of the receivable. We record a contract asset when revenue is recognized in advance of invoicing. Contract assets are presented within accounts receivable on the condensed consolidated balance sheets. Fair Value of Financial Instruments Our financial assets and financial liabilities which may include cash equivalents, marketable securities, and restricted cash, are measured and recorded at fair value on a recurring basis. Non-marketable equity securities include our privately held strategic equity securities without readily determinable fair values. We record these privately held strategic equity securities without readily determinable fair values using a measurement alternative which measures the securities at cost minus impairment, if any, plus or minus changes resulting from qualifying observable price changes with a same or similar security from the same issuer. Our non-marketable equity securities are recorded at fair value only if an impairment or observable price adjustment is recognized in the current period. If an observable price adjustment or impairment is recognized on our non-marketable equity securities, we classify these assets as Level 3 within the fair value hierarchy based on the nature of the fair value inputs. Our other current financial assets have fair values which approximate their carrying value due to their short-term maturities.

Revenue

Revenue	6 Months Ended
	Jul. 31, 2018
Revenue From Contract With Customer [Abstract]
Revenue	Note 2. Revenue Impact of ASC Topic 606 on Condensed Consolidated Financial Statement Line Items The adoption of ASC Topic 606 impacted revenue recognition and incremental costs of obtaining a contract on our condensed consolidated balance sheet as of July 31, 2018 and statement of operations for the three and six months ended July 31, 2018. There was no impact on the total cash (used in) provided by operating activities for the three and six months ended July 31, 2018. Refer to Note 1 for a description of the primary impacts resulting from the adoption of ASC Topic 606. The following tables present the amount by which each condensed consolidated financial statement line item is affected as of and for the three and six months ended July 31, 2018 by ASC Topic 606 (in thousands, except per share data): July 31, 2018 As Reported Balances without adoption of ASC Topic 606 Effect of Change ASSETS Accounts receivable* $ 114,779 $ 114,622 $ 157 Deferred commissions 16,855 14,623 2,232 Deferred commissions, non-current 44,059 7,041 37,018 LIABILITIES AND STOCKHOLDERS’ EQUITY Deferred revenue 281,765 284,249 (2,484 ) Deferred revenue, non-current 19,752 22,042 (2,290 ) Accumulated deficit (1,074,008 ) (1,118,189 ) 44,181 * Contract assets are reported as part of accounts receivable upon the adoption of ASC Topic 606. Three Months Ended July 31, 2018 Six Months Ended July 31, 2018 As Reported Balances without adoption of ASC Topic 606 Effect of Change As Reported Balances without adoption of ASC Topic 606 Effect of Change Revenue $ 148,222 $ 150,941 $ (2,719 ) $ 288,729 $ 294,194 $ (5,465 ) Operating expenses: Sales and marketing 76,984 82,588 (5,604 ) 153,982 163,826 (9,844 ) Loss from operations (37,219 ) (40,104 ) 2,885 (73,079 ) (77,458 ) 4,379 Net loss (38,085 ) (40,970 ) 2,885 (74,722 ) (79,101 ) 4,379 Net loss per common share, basic and diluted $ (0.27 ) $ (0.29 ) $ 0.02 $ (0.54 ) $ (0.57 ) $ 0.03 Weighted-average shares used to compute net loss per share, basic and diluted 140,718 140,718 140,718 139,639 139,639 139,639 Three Months Ended July 31, 2018 Six Months Ended July 31, 2018 As Reported Balances without adoption of ASC Topic 606 Effect of Change As Reported Balances without adoption of ASC Topic 606 Effect of Change CASH FLOWS FROM OPERATING ACTIVITIES: Net loss $ (38,085 ) $ (40,970 ) $ 2,885 $ (74,722 ) $ (79,101 ) $ 4,379 Adjustments to reconcile net loss to net cash (used in) provided by operating activities: Amortization of deferred commissions 4,040 5,980 (1,940 ) 7,715 11,942 (4,227 ) Changes in operating assets and liabilities: Accounts receivable, net (23,754 ) (23,793 ) 39 47,936 47,511 425 Deferred commissions (8,588 ) (4,924 ) (3,664 ) (13,304 ) (7,687 ) (5,617 ) Deferred revenue 14,568 11,888 2,680 (9,592 ) (14,632 ) 5,040 Net cash (used in) provided by operating activities (1,267 ) (1,267 ) — 17,173 17,173 — Contract Assets Contract assets, which are presented within accounts receivable, were $0.2 million as of July 31, 2018. Deferred Revenue Deferred revenue was $301.5 million as of July 31, 2018. $115.2 million of revenue was recognized during the three months ended July 31, 2018 Transaction Price Allocated to the Remaining Performance Obligations As of July 31, 2018, approximately $587.2 million of revenue is expected to be recognized from remaining performance obligations for subscription contracts. We expect to recognize revenue on 66% of these remaining performance obligations over the next 12 months, with the balance recognized thereafter.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jul. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 3. Fair Value Measurements We define fair value as the exchange price that would be received from selling an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. We measure our financial assets and liabilities at fair value at each reporting period using a fair value hierarchy which requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value: • Level 1—Observable inputs are unadjusted quoted prices in active markets for identical assets or liabilities. • Level 2—Observable inputs are quoted prices for similar assets and liabilities in active markets or inputs other than quoted prices that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. These inputs are based on our own assumptions used to measure assets and liabilities at fair value and require significant management judgment or estimation. We measure restricted cash at fair value on a recurring basis. We classify this asset within Level 1 or Level 2 because they are valued using either quoted market prices for identical assets or inputs other than quoted prices that are directly or indirectly observable in the market, including readily-available pricing sources for the identical underlying security which may not be actively traded. Restricted cash in the form of certificates of deposits related to our leases

Balance Sheet Components

Balance Sheet Components	6 Months Ended
	Jul. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Components	Note 4. Balance Sheet Components Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consisted of the following (in thousands): July 31, January 31, 2018 2018 Prepaid expenses $ 13,430 $ 8,494 Other current assets 3,029 2,897 Total prepaid expenses and other current assets $ 16,459 $ 11,391 Property and Equipment, Net Property and equipment, net consisted of the following (in thousands): July 31, January 31, 2018 2018 Servers $ 186,205 $ 170,422 Leasehold improvements 75,307 72,599 Computer hardware and software 15,920 14,558 Furniture and fixtures 15,288 14,254 Construction in progress 9,897 7,348 Total property and equipment 302,617 279,181 Less: accumulated depreciation (177,260 ) (155,204 ) Total property and equipment, net $ 125,357 $ 123,977 As of July 31, 2018, the gross carrying amount of property and equipment included $91.1 million of servers and $6.8 million of construction in progress acquired under capital leases, and the accumulated depreciation of property and equipment acquired under these capital leases was $41.4 million. As of January 31, 2018, the gross carrying amount of property and equipment included $74.7 million of servers and related equipment and $3.7 million of construction in progress acquired under capital leases, and the accumulated depreciation of property and equipment acquired under these capital leases was $29.1 million. Depreciation expense related to property and equipment was $11.8 million and $9.7 million for the three months ended July 31, 2018 and 2017, respectively, and $23.2 million and $18.9 million for the six months ended July 31, 2018 and 2017, respectively. Included in these amounts was depreciation expense for servers acquired under capital leases in the amount of $6.4 million and $4.6 million for the three months ended July 31, 2018 and 2017, respectively and $12.3 million and $8.4 million for six months ended July 31, 2018 and 2017, respectively. Construction in progress primarily consists of servers and networking equipment and storage infrastructure being provisioned in our datacenter facilities. Other Long-term Assets Other long-term assets consisted of the following (in thousands): July 31, January 31, 2018 2018 Deposits, non-current $ 2,686 $ 2,934 Other assets, non-current 2,525 2,469 Other long-term assets $ 5,211 $ 5,403

Business Combinations

Business Combinations	6 Months Ended
	Jul. 31, 2018
Business Combinations [Abstract]
Business Combinations	Note 5. Business Combinations Other Business Combinations and Similar Transactions During the second quarter of fiscal year 2019, we entered into agreements to hire certain employees from three privately-held technology companies for total aggregate consideration of $2.4 million paid in a mix of cash and shares of our Class A common stock. We accounted for these transactions as business combinations. The entire consideration for these transactions was allocated to goodwill. Goodwill is primarily attributable to the enhancement of the Box user experience and the value of hired personnel Results of operations for these business combinations have been included in our condensed consolidated statements of operations subsequent to the transaction completion date and were not material. Pro forma results of operations for these transactions have not been presented because they were also not material to the consolidated results of operations.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jul. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Note 6. Goodwill and Intangible Assets Goodwill activity is reflected in the following table (in thousands): Balance as of January 31, 2018 $ 16,293 Goodwill acquired 2,447 Balance as of July 31, 2018 $ 18,740 Intangible amortization expense was not material for the three and six months ended July 31, 2018 and 2017. Amortization of acquired technology is included in cost of revenue and amortization for trade names is included in general and administrative expenses in the condensed consolidated statements of operations. As of July 31, 2018, all intangible assets were fully amortized.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jul. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 7. Commitments and Contingencies Letters of Credit As of July 31, 2018 and January 31, 2018, we had letters of credit in the aggregate amount of $26.8 million and $26.4 million, respectively, in connection with our operating leases, which were primarily issued under the available sublimit of $30.0 million in conjunction with a secured credit agreement entered on November 27, 2017. Refer to Note 8 for additional details related to the secured credit agreement mentioned. Leases We have entered into various non-cancellable operating lease agreements for certain of our offices and datacenters with lease periods expiring primarily between fiscal years 2020 and 2029. Certain of these arrangements have free or escalating rent payment provisions and optional renewal clauses. We are also committed to pay a portion of the actual operating expenses under certain of these lease agreements. These operating expenses are not included in the table below. We also entered into various capital lease arrangements to obtain servers and related equipment for our operations. These agreements typically have an initial term of three to four years. The leases are secured by the underlying leased servers and related equipment. As of July 31, 2018, future minimum lease payments under non-cancellable capital and operating leases are as follows (in thousands): Years ending January 31: Capital Leases Operating Leases, Sublease Income Remainder of 2019 $ 12,135 $ 17,442 2020 19,343 35,855 2021 15,290 36,576 2022 7,436 34,350 2023 961 26,453 Thereafter — 143,298 Total minimum lease payments $ 55,165 $ 293,974 Less: amount representing interest (2,047 ) Present value of minimum lease payments $ 53,118 We sublease certain floors of our headquarters and San Francisco office. These subleases have terms ranging from 25 to 55 months that will expire at various dates by fiscal year 2023. Non-cancellable sublease proceeds for the years ending January 31, 2019, 2020, 2021, 2022, and 2023 of $3.8 million, $7.7 million, $7.0 million, $5.0 million, and $4.2 million, respectively, are included in the table above. We establish assets and liabilities for the present value of estimated future costs to return certain of our leased facilities to their original condition. Such assets are depreciated over the lease period into operating expense, and the recorded liabilities are accreted to the future value of the estimated restoration costs. We did not have material asset retirement obligations as of July 31, 2018 and January 31, 2018. We recognize rent expense under our operating leases on a straight-line basis. Rent expense totaled $8.3 million and $6.9 million, net of sublease income of $2.1 million and $1.9 million for the three months ended July 31, 2018 and 2017, respectively, and rent expense totaled $16.6 million and $12.2 million, net of sublease income of $4.0 million and $3.7 million for the six months ended July 31, 2018 and 2017, respectively. Purchase Obligations As of July 31, 2018, future payments under non-cancellable contractual purchases, which relate primarily to infrastructure services, datacenter operations, and sales and marketing activities, are as follows (in thousands): Years ending January 31: Remainder of 2019 $ 21,845 2020 46,594 2021 11,383 2022 1,514 2023 851 Thereafter 694 $ 82,881 Legal Matters From time to time, we are a party to litigation and subject to claims that arise in the ordinary course of business. We investigate these claims as they arise and accrue estimates for resolution of legal and other contingencies when losses are probable and estimable. Although the results of litigation and claims cannot be predicted with certainty, we believe there was not at least a reasonable possibility that we had incurred a material loss with respect to such loss contingencies as of July 31, 2018. Indemnification We include service level commitments to our customers warranting certain levels of uptime reliability and performance and permitting those customers to receive credits in the event that we fail to meet those levels. In addition, our customer contracts often include (i) specific obligations that we maintain the availability of the customer’s data through our service and that we secure customer content against unauthorized access or loss, and (ii) indemnity provisions whereby we indemnify our customers for third-party claims asserted against them that result from our failure to maintain the availability of their content or securing the same from unauthorized access or loss. To date, we have not incurred any material costs as a result of such commitments. Our arrangements generally include certain provisions for indemnifying customers against liabilities if our products or services infringe a third party’s intellectual property rights. It is not possible to determine the maximum potential amount under these indemnification obligations due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. To date, we have not incurred any material costs as a result of such obligations and have not accrued any material liabilities related to such obligations on the condensed consolidated financial statements. In addition, we indemnify our officers, directors and certain key employees while they are serving in good faith in their respective capacities. To date, there have been no claims under any indemnification provisions.

Debt

Debt	6 Months Ended
	Jul. 31, 2018
Debt Disclosure [Abstract]
Debt	Note 8. Debt Line of Credit In December 2015, we entered into a revolving credit facility (December 2015 Facility), which provided for a revolving loan facility in the amount of up to $40.0 million originally maturing in December 2017. In February 2017, we amended the December 2015 Facility to extend the maturity date to December 2018. On November 27, 2017, we The December 2015 Facility was denominated in U.S. dollars and, depending on certain conditions, each borrowing was subject to a floating interest rate equal to either the prime rate plus a spread of 0.25% to 2.75% or a reserve adjusted LIBOR rate (based on one, three or six-month interest periods) plus a spread of 1.25% to 3.75%. Although no minimum deposit was required for the December 2015 Facility, we were eligible for the lowest interest rate if we maintained at least $40 million in deposits with the lender. In addition, there was an annual fee of 0.2% on the total commitment amount. We drew $40.0 million at 1.82% (six month LIBOR plus 1.25%). Borrowings under the December 2015 Facility were collateralized by substantially all of our assets in the United States. The December 2015 Facility also contained various covenants, including covenants related to the delivery of financial and other information, the maintenance of quarterly financial covenants, as well as customary limitations on dispositions, mergers or consolidations and other corporate activities. In February 2017, we amended the December 2015 Facility to extend the maturity date to December 2018. Interest expense, net of capitalized interest costs, for the periods presented is not material. The November 2017 Facility provides for an $85.0 million revolving credit facility, with a sublimit of $30.0 million available for the issuance of letters of credit. The proceeds of the revolving loans may be used for general corporate purposes. The revolving loans accrue interest at a prime rate plus a margin of 0.25% or, at our option, a LIBOR rate (based on one, three or six-month interest periods) plus a margin of 1.00%. Interest on the revolving loans is payable quarterly in arrears with respect to loans based on the prime rate and at the end of an interest period in the case of loans based on the LIBOR rate (or at each three-month interval if the interest period is longer than three months). Borrowings under the November 2017 Facility are collateralized by substantially all of our assets. The November 2017 Facility requires us to comply with a maximum leverage ratio and a minimum liquidity requirement. Additionally, the November 2017 Facility contains customary affirmative and negative covenants, including covenants limiting our, and our subsidiaries’, ability to, among other things, grant liens, incur debt, pay dividends or distributions on the capital stock, effect certain mergers, make investments, dispose of assets and enter into transactions with affiliates, in each case subject to customary exceptions for a credit facility of the size and type of the November 2017 Facility. On November 29, 2017, the restrictions on our certificates of deposits that previously collateralized existing letters of credit were released as the letters of credit were included under the November 2017 Facility letter of credit sublimit. As such, we released $26.1 million from restricted cash to cash and cash equivalents. Refer to Note 7 for additional details on the letters of credit and Note 3 for additional details on restricted cash in the form of certificates of deposits. As of July 31, 2018, we were in compliance with all financial covenants. In connection with the above credit facilities, for the three and six months ended July 31, 2018 and 2017, interest expense, net of capitalized interest costs, was not material. During the same periods, the amounts of interest capitalized were not material. Interest expense in connection with the above credit facilities may include interest charges for our line of credit

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jul. 31, 2018
Stockholders Equity Note [Abstract]
Stockholders' Equity	Note 9. Stockholders’ Equity Material modification of rights of security holders On June 14, 2018, all of our outstanding shares of Class B common stock automatically converted into the same number of shares of Class A common stock pursuant to the terms of our Amended and Restated Certificate of Incorporation. No additional shares of Class B common stock will be issued following such conversion. The conversion occurred pursuant to Article IV of the Amended and Restated Certificate of Incorporation, which provided that each one share of Class B common stock would convert automatically, without any further action, into one share of Class A common stock on the first trading day falling on or after the date on which the outstanding shares of Class B common stock represent less than 5% of the aggregate number of shares of the then outstanding Class A common stock and Class B common stock. On June 15, 2018, we filed a certificate with the Secretary of State of the State of Delaware effecting the retirement and cancellation of our Class B common stock. This certificate of retirement had the additional effect of eliminating the authorized Class B common stock, thereby reducing the total number of our authorized shares of common stock by 200,000,000. Our Class A and Class B common stock are referred to as common stock throughout the notes to the financial statements, unless otherwise noted. After June 14, 2018, common stock refers to our Class A common stock. Common stock As of July 31, 2018, we had authorized 1,000,000,000 shares of Class A common stock, par value of $0.0001 per share. As of July 31, 2018, 141,605,601 shares of Class A common stock were issued and outstanding. As of January 31, 2018, we had authorized 1,000,000,000 shares of Class A common stock and 200,000,000 shares of Class B common stock, each at par value of $0.0001 per share. As of January 31, 2018, 125,933,323 shares of Class A common stock and 11,383,525 shares of Class B common stock were issued and outstanding. Preferred stock As of July 31, 2018 and January 31, 2018, we had authorized 100,000,000 shares of undesignated preferred stock, par value of $0.0001 per share. No shares issued and outstanding in the same respective periods.

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jul. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	Note 10. Stock-Based Compensation 2015 Equity Incentive Plan In January 2015, our board of directors adopted the 2015 Equity Incentive Plan (2015 Plan), which became effective prior to the completion of our initial public offering (IPO). A total of 12,200,000 shares of Class A common stock was initially reserved for issuance pursuant to future awards under the 2015 Plan. On the first day of each fiscal year, shares available for issuance are increased based on the provisions of the 2015 Plan. Any shares subject to outstanding awards under our 2006 Equity Incentive Plan (2006 Plan) or 2011 Equity Incentive Plan (2011 Plan) that are cancelled or repurchased subsequent to the 2015 Plan’s effective date are returned to the pool of shares reserved for issuance under the 2015 Plan. Awards granted under the 2015 Plan may be (i) incentive stock options, (ii) nonstatutory stock options, (iii) restricted stock units, (iv) restricted stock awards or (v) stock appreciation rights, as determined by our board of directors at the time of grant. Twenty-five percent of each grant of stock options and restricted stock units generally vest one year from the vesting commencement date and continue to vest (a) in the case of options, 1/48 th 2015 Employee Stock Purchase Plan In January 2015, our board of directors adopted the 2015 Employee Stock Purchase Plan (2015 ESPP), which became effective prior to the completion of our IPO. A total of 2,500,000 shares of Class A common stock was initially reserved for issuance under the 2015 ESPP. On the first day of each fiscal year, shares available for issuance are increased based on the provisions of the 2015 ESPP. The 2015 ESPP allows eligible employees to purchase shares of our Class A common stock at a discount of up to 15% through payroll deductions of their eligible compensation, subject to any plan limitations. The 2015 ESPP provides for 24-month offering periods beginning March 16 and September 16 of each year, and each offering period consists of four six-month purchase periods. On each purchase date, eligible employees may purchase our stock at a price per share equal to 85% of the lesser of (1) the fair market value of our stock on the offering date or (2) the fair market value of our stock on the purchase date. In the event the price is lower on the last day of any purchase price period, in addition to using that price as the basis for that purchase period, the offering period resets and the new lower price becomes the new offering price for a new 24 month offering period. As of July 31, 2018, 2,571,580 shares were reserved for future issuance under the 2015 ESPP. Stock Options The following table summarizes the stock option activity under the equity incentive plans and related information: Shares Weighted-Average Weighted- Remaining Average Exercise Contractual Life Aggregate Shares Price (Years) Intrinsic Value (in thousands) Balance as of January 31, 2018 10,843,120 $ 8.32 5.74 $ 150,922 Options granted 697,686 20.84 Option exercised (1,446,438 ) 8.87 Options forfeited/cancelled (408,689 ) 13.93 Balance as of July 31, 2018 9,685,679 $ 8.90 5.44 $ 146,041 Vested and expected to vest as of July 31, 2018 9,601,241 $ 8.82 5.41 $ 145,527 Exercisable as of July 31, 2018 7,817,955 $ 6.73 4.66 $ 134,679 The aggregate intrinsic value of options vested and expected to vest and exercisable as of July 31, 2018 is calculated based on the difference between the exercise price and the current fair value of our common stock. The aggregate intrinsic value of exercised options for the six months ended July 31, 2018 and 2017 was $22.5 million and $11.2 million, respectively. The aggregate estimated fair value of stock options granted to employees that vested for the six months ended July 31, 2018 and 2017 was $3.9 million and $4.8 million, respectively. The weighted-average grant date fair value of options granted to employees during the six months ended July 31, 2018 and 2017 was $8.23 and $6.82 per share, respectively. As of July 31, 2018, there was $11.1 million of unrecognized stock-based compensation expense related to outstanding stock options granted to employees that is expected to be recognized over a weighted-average period of 2.74 years. Out of the total unrecognized stock-based compensation expense, as of July 31, 2018, $4.7 million related to outstanding performance-based stock option, based on the probable market-based performance goals and service condition at that date, which is expected to be recognized over a weighted-average period of 3.54 years. Performance-Based Stock Options In April 2017, the compensation committee of our board of directors approved and granted 475,000 performance-based stock options under the 2015 Plan to certain executive officers where vesting is subject to both the continued employment of the participant and the achievement of market-based performance goals established by the compensation committee. Subject to both the continued employment of the participant and the achievement of market-based performance goals established by the compensation committee, 25% of the performance-based options vest one year from the vesting commencement date, and 1/48th continue to vest each month thereafter. The total amount of compensation expense recognized is based on the number of shares that we determine are probable of vesting and is recognized over the vesting term of the awards. Of the 475,000 performance-based stock options, 250,000 were forfeited in connection with a participant’s resignation of employment during the three months ended October 31, 2017. As of July 31, 2018, the market-based performance goals were met. The performance-based stock options are vesting based on the continued employment of the participant. The grant date fair value of these awards was determined using a Monte Carlo valuation model and the related stock-based compensation expense is recognized based on an accelerated attribution method. In April 2018, the compensation committee of our board of directors approved and granted 650,000 performance-based stock options under the 2015 Plan to certain executive officers where vesting is subject to both the continued employment of the participant and the achievement of market-based performance goals established by the compensation committee. Subject to both the continued employment of the participant and the achievement of market-based performance goals established by the compensation committee, 25% of the performance-based options vest one year from the vesting commencement date, and 1/48th continue to vest each month thereafter. The total amount of compensation expense recognized is based on the number of shares that we determine are probable of vesting and is recognized over the vesting term of the awards. As of July 31, 2018, the market-based performance goals were not met. The grant date fair value of these awards was determined using a Monte Carlo valuation model and the related stock-based compensation expense is recognized based on an accelerated attribution method. Restricted Stock Units The following table summarizes the restricted stock unit activity under the equity incentive plans and related information: Number of Weighted- Restricted Average Stock Units Grant Date Outstanding Fair Value Unvested balance - January 31, 2018 14,619,252 $ 16.42 Granted 6,968,238 22.26 Vested, net of shares withheld for employee payroll taxes (1,786,786 ) 16.30 Forfeited/cancelled (1,940,121 ) 16.97 Unvested balance - July 31, 2018 17,860,583 $ 18.65 As of July 31, 2018, there was $261.8 million of unrecognized stock-based compensation expense related to outstanding restricted stock units granted to employees that is expected to be recognized over a weighted-average period of 3.11 years. 2015 ESPP As of July 31, 2018, there was $11.8 million of unrecognized stock-based compensation expense related to the 2015 ESPP that is expected to be recognized over the remaining term of the respective offering periods. Stock-Based Compensation The following table summarizes the components of stock-based compensation expense recognized in the condensed consolidated statements of operations (in thousands): Three Months Ended Six Months Ended July 31, July 31, 2018 2017 2018 2017 Cost of revenue $ 3,561 $ 2,663 $ 6,682 $ 5,131 Research and development 11,477 9,554 21,625 18,714 Sales and marketing 9,932 7,934 17,993 15,674 General and administrative 5,713 3,916 10,996 7,494 Total stock-based compensation $ 30,683 $ 24,067 $ 57,296 $ 47,013 Determination of Fair Value We estimated the fair value of employee stock options and 2015 ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions. Three Months Ended Six Months Ended July 31, July 31, 2018 2017 2018 2017 Employee Stock Options Expected term (in years) 5.5 - 5.8 5.5 - 6.0 5.5 - 5.8 5.5 - 6.0 Risk-free interest rate 2.2% - 2.3% 1.8% - 2.0% 2.2% - 2.3% 1.8% - 2.4% Volatility 45% - 45% 38% - 39% 45% - 45% 38% - 40% Dividend yield 0% 0% 0% 0% Employee Stock Purchase Plan Expected term (in years) 0.5 - 2.0 0.5 - 2.0 0.5 - 2.0 0.5 - 2.0 Risk-free interest rate 2.0% - 2.3% 0.9% - 1.4% 2.0% - 2.3% 0.9% - 1.4% Volatility 37% - 50% 28% - 43% 37% - 50% 28% - 43% Dividend yield 0% 0% 0% 0% The assumptions used in the Black-Scholes option pricing model were determined as follows: Fair Value of Common Stock . We use the market closing price for our Class A common stock as reported on the New York Stock Exchange to determine the fair value of our common stock at each grant date. Expected Term . The expected term represents the period that our share-based awards are expected to be outstanding. The expected term assumptions were determined based on the vesting terms, exercise terms and contractual lives of the options and 2015 ESPP purchase rights. Expected Volatility . We estimate the expected volatility of the stock option grants and 2015 ESPP purchase rights based on the historical volatility of our Class A common stock over a period equivalent to the expected term of the stock option grants and 2015 ESPP purchase rights, respectively. Risk-free Interest Rate . The risk-free rate that we use is based on the implied yield available on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term on the stock options and 2015 ESPP purchase rights. Dividend Yield . We have never declared or paid any cash dividends and do not plan to pay cash dividends in the foreseeable future, and, therefore, use an expected dividend yield of zero.

Net Loss Per Share

Net Loss Per Share	6 Months Ended
	Jul. 31, 2018
Earnings Per Share [Abstract]
Net Loss per Share	Note 11. Net Loss per Share On June 14, 2018, all of our outstanding shares of Class B common stock automatically converted into the same number of shares of Class A common stock pursuant to the terms of our Amended and Restated Certificate of Incorporation. No additional shares of Class B common stock will be issued following such conversion. Refer to Note 9 for additional details related to the conversion of Class B common stock. For periods where there were Class B shares outstanding, we calculate our basic and diluted net loss per share in conformity with the two-class method required for companies with participating securities. Under the two-class method, basic net loss per share is calculated by dividing the net loss by the weighted-average number of shares of common stock outstanding for the period, less shares subject to repurchase. The diluted net loss per share is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, options to purchase common stock, restricted stock units, shares issuable pursuant to our employee stock purchase plan, shares subject to repurchase from early exercised options and unvested restricted stock, and contingently issuable shares are considered common stock equivalents but have been excluded from the calculation of diluted net loss per share as their effect is antidilutive. The rights, including the liquidation and dividend rights, of the holders of our Class A and Class B common stock are identical, except with respect to voting and conversion. As the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis and the resulting net loss per share will, therefore, be the same for both Class A and Class B common stock on an individual or combined basis. We did not present dilutive net loss per share on an as-if converted basis because the impact was not dilutive. The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts): Three Months Ended July 31, 2018 2017 Class A Class B Class A Class B Numerator: Net loss $ (37,001 ) $ (1,084 ) $ (27,909 ) $ (11,376 ) Denominator: Weighted-average number of shares outstanding— basic and diluted 136,712 4,006 94,471 38,510 Net loss per share—basic and diluted $ (0.27 ) $ (0.27 ) $ (0.30 ) $ (0.30 ) Six Months Ended July 31, 2018 2017 Class A Class B Class A Class B Numerator: Net loss $ (70,718 ) $ (4,004 ) $ (50,163 ) $ (29,208 ) Denominator: Weighted-average number of shares outstanding—basic and diluted 132,156 7,483 83,574 48,663 Net loss per share—basic and diluted $ (0.54 ) $ (0.54 ) $ (0.60 ) $ (0.60 ) The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because the impact of including them would have been antidilutive (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Options to purchase common stock 10,085 12,345 10,301 12,267 Restricted stock units 15,095 13,624 14,313 13,088 Employee stock purchase plan 2,173 1,989 1,841 2,075 Repurchasable shares from early-exercised options and unvested restricted stock — 214 — 227 Contingently issuable common stock — 54 — 56 27,353 28,226 26,455 27,713

Income Taxes

Income Taxes	6 Months Ended
	Jul. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Note 12. Income Taxes On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (“Tax Act”). The Tax Act reduces the U.S. federal corporate tax rate from 34% to 21%, imposes a one-time repatriation tax, and numerous other provisions transitioning to a territorial system. The changes included in the Tax Act are broad and complex. The SEC has issued SAB 118 that would allow for a measurement period of up to one year after the enactment date of the Tax Act to finalize the recording of the related tax impacts. We currently anticipate finalizing and recording any resulting adjustments by the year ending January 31, 2019. The Tax Act also includes provisions for Global Intangible Low-Taxed Income (“GILTI”) wherein taxes on foreign income are imposed in excess of a deemed return on tangible assets of foreign corporations. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income Utilization of the federal and state NOLs may be subject to substantial annual limitation due to the ownership change limitations provided by Section 382 of the Internal Revenue Code of 1986, as amended, and similar state provisions. The annual limitation may result in the expiration of net operating losses and credits before utilization. We evaluate tax positions for recognition using a more-likely-than-not recognition threshold, and those tax positions eligible for recognition are measured as the largest amount of tax benefit that is greater than 50% likely of being realized upon the effective settlement with a taxing authority that has full knowledge of all relevant information. We file tax returns in the United States for federal, California, and other states. All tax years remain open to examination for both federal and state purposes as a result of our net operating loss and credit carryforwards. We began to file foreign tax returns in the United Kingdom starting with the year ended January 31, 2013, in France, Germany and Japan starting with the year ended January 31, 2014, in Canada starting with the year ended January 31, 2015, and in Australia, Sweden, and Netherlands starting with the year ended January 31, 2016. Certain tax years remain open to examination. As a result of our adoption of ASC Topic 606 as of February 1, 2018, the $9.8 million decrease of deferred revenue and the $29.4 million increase to deferred commissions resulted in additional deferred tax liabilities that reduced our net deferred tax asset position. The net deferred tax assets in the jurisdictions impacted by the adoption of ASC Topic 606 were fully reserved and, accordingly, this impact was offset by a corresponding reduction to the valuation allowance with no resulting net impact to our net assets or accumulated deficit. We believe that we have provided adequate reserves for our income tax uncertainties in all open tax years. We do not expect our gross unrecognized tax benefits to change significantly over the next 12 months.

Segments

Segments	6 Months Ended
	Jul. 31, 2018
Segment Reporting [Abstract]
Segments	Note 13. Segments Our chief operating decision maker reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. As such, we have a single reporting segment and operating unit structure. Since we operate in one operating segment, all required segment information can be found in the condensed consolidated financial statements.

Description of Business and B20

Description of Business and Basis of Presentation (Policies)	6 Months Ended
	Jul. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated balance sheet as of July 31, 2018 and the condensed consolidated statements of operations, the condensed consolidated statements of comprehensive loss and the condensed consolidated statements of cash flows for the three and six months ended July 31, 2018 and 2017, respectively, are unaudited. The condensed consolidated balance sheet data as of January 31, 2018 was derived from the audited consolidated financial statements that are included in our Annual Report on Form 10-K for the fiscal year ended January 31, 2018 (the “Form 10-K”), which was filed with the Securities and Exchange Commission (the “SEC”) on March 22, 2018. The accompanying statements should be read in conjunction with the audited consolidated financial statements and related notes contained in our Form 10-K. Other than items discussed under Recently Adopted Accounting Pronouncements and Summary of Significant Accounting Policies , there have been no other material changes to our critical accounting policies and estimates during the six months ended July 31, 2018 from those disclosed in Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Form 10-K. The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information. Accordingly, they do not include all of the financial information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of our management, the unaudited condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements in the Form 10-K, and include all adjustments necessary for the fair presentation of our balance sheet as of July 31, 2018, and our results of operations, including our comprehensive loss, and our cash flows for the three and six months ended July 31, 2018 and 2017. All adjustments are of a normal recurring nature. The results for the three and six months ended July 31, 2018 are not necessarily indicative of the results to be expected for any subsequent quarter or for the fiscal year ending January 31, 2019. Certain prior period amounts reported in our condensed consolidated financial statements and notes thereto have been reclassified to conform to the current year presentation. Such reclassifications did not affect total revenues, operating income, or net income.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make, on an ongoing basis, estimates and assumptions that affect the amounts reported and disclosed in the financial statements and the accompanying notes. Actual results could differ from these estimates. Such estimates include, but are not limited to, the determination of the allowance for accounts receivable, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, estimate of standalone selling price allocation included in contracts with multiple performance obligations, the estimated expected benefit period for deferred commissions, observable price changes of ,
Certain Risks and Concentrations	Certain Risks and Concentrations Our financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, restricted cash, and accounts receivable. Although we deposit our cash with multiple financial institutions, our deposits, at times, may exceed deposit insurance coverage limits. We sell to a broad range of customers, including resellers. Our revenue is derived substantially from the United States across a multitude of industries. Accounts receivable are derived from the delivery of our services to customers primarily located in the United States. We accept and settle our accounts receivable using credit cards, electronic payments and checks. A majority of our lower dollar value invoices are settled by credit card on or near the date of the invoice. We do not require collateral from customers to secure accounts receivable. We maintain an allowance for doubtful accounts based upon the expected collectability, which takes into consideration specific customer creditworthiness and current economic trends. We believe collections of our accounts receivable are reasonably assured based on the size, industry diversification, financial condition and past transaction history of our customers. As of July 31, 2018, no single customer, including resellers, represented over 10% of total accounts receivable. As of January 31, 2018, one reseller, which is also a customer, accounted for more than 10% of total accounts receivable. One reseller, which is also a customer, represented over 10% of revenue for the three and six months ended July 31, 2018. No single customer represented over 10% of revenue for the three and six months ended July 31, 2017. We serve our customers and users from datacenter facilities operated by third parties. In order to reduce the risk of down time of our subscription services, we have established datacenters and third-party cloud computing and hosting providers in various locations in the United States and abroad. We have internal procedures to restore services in the event of disaster at any one of our current datacenter facilities. Even with these procedures for disaster recovery in place, our cloud services could be significantly interrupted during the implementation of the procedures to restore services. Geographic Locations For the three and six months ended July 31, 2018, revenue attributable to customers in the United States and customers outside the United States was 76% and 24%, respectively. For the three and six months ended July 31, 2017, revenue attributable to customers in the United States and customers outside the United States was 79% and 21%, respectively. No other country outside of the United States comprised 10% or greater of our revenue for any of the periods presented. Substantially all of our net assets are located in the United States. As of July 31, 2018 and January 31, 2018, property and equipment located in the United States was 91% and 95%, respectively.
Recently Adopted and Issued Accounting Pronouncements	Recently Adopted Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09 and its related amendments regarding Accounting Standards Codification Topic 606 (ASC Topic 606), Revenue from Contracts with Customers Adoption Impact of ASC Topic 606 on the Opening Balance Sheet as of February 1, 2018 Under ASC Topic 606, there is a change in the timing of revenue recognition for certain sales contracts primarily due to the removal of the contingent revenue limitation pursuant to ASC Topic 605. Under ASC Topic 606, we capitalize costs based on the definition of incremental costs of obtaining a contract and commence amortization upon the transfer of services to the customer. Such costs are generally amortized over five years, which represents a longer period over which we had previously amortized, in order to align to an estimated expected benefit period under ASC Topic 606. Additionally, the scope of costs capitalized under ASC Topic 606 is significantly broader than the scope prior to ASC Topic 606, resulting in additional costs being capitalized. The adoption of ASC Topic 606 had no impact on our cash flows from operations. The following table summarizes the adjustments made to account on the condensed consolidated balance sheet as of February 1, 2018 as a result of applying the modified retrospective method to adopt ASC Topic 606 (in thousands): As Reported Adjustments As Adjusted January 31, 2018 Revenue Recognition Incremental Costs of Obtaining a Contract February 1, 2018 Accounts receivable* $ 162,133 $ 582 $ 162,715 Deferred commissions 17,589 $ (3,449 ) 14,140 Deferred commissions, non-current** 8,330 32,855 41,185 Deferred revenue 291,902 (8,483 ) 283,419 Deferred revenue, non-current 29,021 (1,331 ) 27,690 Accumulated deficit (1,039,088 ) 10,396 29,406 (999,286 ) * Contract assets are reported as part of accounts receivable upon the adoption of ASC Topic 606. ** As of January 31, 2018, deferred commissions, non-current was reported as part of other long-term assets. The condensed consolidated balance sheet as of January 31, 2018 was reclassified to conform to the current period presentation. The decrease of deferred revenue and increase to deferred commissions as of February 1, 2018 resulted in additional deferred tax liabilities that reduced our net deferred tax asset position. The net deferred tax assets in the jurisdictions impacted by the adoption of ASC Topic 606 were fully reserved and, accordingly, this impact was offset by a corresponding reduction to the valuation allowance with no resulting net impact to our net assets or accumulated deficit. In addition, the adoption of the ASC Topic 606 resulted in changes to our accounting estimates and policies for revenue recognition, deferred commissions, deferred revenue, and accounts receivable and related allowance. Please see Summary of Significant Accounting Policies for a discussion of our updated policies. Ongoing ASC Topic 606 Financial Statement Impact as of and for the three and six months ended July 31, 2018 Refer to “ Note 2. Revenue ” for the ongoing ASC Topic 606 impact on the condensed consolidated financial statement line items as of and for the three and six months ended July 31, 2018. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows: Restricted Cash Three Months Ended July 31, 2017 Six Months Ended July 31, 2017 As Reported Adjustments As Adjusted As Reported Adjustments As Adjusted Changes in operating assets and liabilities: Prepaid expenses and other assets, current and noncurrent* $ (3,164 ) $ (238 ) $ (3,402 ) $ (5,705 ) $ (238 ) $ (5,943 ) Net cash used in operating activities (9,523 ) (238 ) (9,761 ) (982 ) (238 ) (1,220 ) Net decrease in cash, cash equivalents, and restricted cash (18,416 ) (238 ) (18,654 ) (12,116 ) (238 ) (12,354 ) Cash, cash equivalents, and restricted cash, beginning of period 183,691 26,781 210,472 177,391 26,781 204,172 Cash, cash equivalents, and restricted cash, end of period 165,275 26,543 191,818 165,275 26,543 191,818 * Changes in restricted cash were included as part of prepaid expenses and other assets, current and noncurrent. In January 2016, the FASB issued ASU 2016-01, Financial Instruments (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities Technical Corrections and Improvements to Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. In addition, the adoption of the ASU 2016-01 and 2018-03 resulted in changes to our accounting policies for fair value of financial instruments. Please see Summary of Significant Accounting Policies for a discussion of our updated policies. In June 2018, the FASB issued ASU 2018-07, Compensation – Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting In October 2016, the FASB issued ASU 2016-16, Accounting for Income Taxes: Intra-Entity Asset Transfers of Assets Other than Inventory, related to the accounting for income tax effects on intra-entity asset transfers of assets other than inventory. The new guidance requires reporting entities to recognize tax expense from the sale of assets when the transfer occurs, even though the pre-tax effects of the transaction are eliminated in consolidation. We adopted ASU 2016-16 in the first quarter of fiscal year 2019 on a modified retrospective basis. The adoption did not result in a material impact on our condensed consolidated financial statements. Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, Leases Note 7. Commitments and Contingencies In June 2016, the FASB issued ASU 2016-13, Financial Instruments- Credit Losses
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Except for the accounting policies for revenue recognition, deferred commissions, deferred revenue, accounts receivable and related allowance, and fair value of financial instruments Summary of Significant Accounting Policies
Revenue Recognition	Revenue Recognition We derive our revenue primarily from three sources: (1) subscription revenue, which is comprised of subscription fees from customers who have access to our cloud content management platform and other subscription-based services, which all include routine customer support; (2) revenue from customers purchasing our premier services package; and (3) revenue from professional services such as implementing best practice use cases, project management and implementation consulting services. Revenue is recognized when control of these services are transferred to a customer. The amount of revenue recognized reflects the consideration we expect to be entitled to in exchange for those services. We determine revenue recognition through the following steps: • Identification of the contract, or contracts, with a customer • Identification of the performance obligations in the contract • Determination of the transaction price • Allocation of the transaction price to the performance obligations in the contract • Recognition of revenue when, or as we, satisfy a performance obligation Subscription and Premier Services Revenues Subscription and premier services revenue are generally recognized on a ratable basis over the contract term beginning on the date that our service is made available to the customer. We typically invoice our customers at the beginning of the term, in multiyear, annual, quarterly or monthly installments. Our subscription and premier services contracts generally range from one to three years in length, are typically non-cancellable and do not contain refund-type provisions. Revenue is presented net of sales and other taxes we collect on behalf of governmental authorities. Professional Services Professional services are generally billed on a fixed price basis, for which revenue is recognized over time based on the proportion performed. Contracts with Multiple Performance Obligations Our contracts can include multiple performance obligations which may consist of some or all of subscription services, premier services, and professional services. 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 basis. We determine the standalone selling prices based on our overall pricing objectives, taking into consideration discounting practices, the size and volume of our transactions, the customer demographic, the geographic area where services are sold, price lists, our go-to-market strategy, historical standalone sales and contract prices.
Deferred Commissions	Deferred Commissions Sales commissions earned by our sales force are considered incremental and recoverable costs of obtaining a contract with a customer. Sales commissions for new contracts are deferred and then amortized on a straight-line basis over a period of benefit that we have estimated to be five years. We determined the period of benefit by taking into consideration our customer contracts, our technology and other factors. Sales commissions for renewal contracts are deferred and then amortized on a straight-line basis over the related contractual renewal period. Amortization expense is included in sales and marketing expenses on the condensed consolidated statements of operations. We apply the practical expedient in ASC Topic 606 to expense costs as incurred for sales commissions when the amortization period would have been one year or less.
Deferred Revenue	Deferred Revenue Deferred revenue consists of billings and payments received in advance of revenue recognition generated by our subscription services, premier services, and professional services described above. ASC Topic 606 introduced the concept of contract liabilities, which is substantially similar to deferred revenue under previous accounting guidance.
Accounts Receivable and Related Allowance	Accounts Receivable and Related Allowance Accounts receivable are recorded at the invoiced amounts and do not bear interest. We maintain an allowance for estimated losses inherent in our accounts receivable portfolio. We assess the collectability of the accounts by taking into consideration the aging of our trade receivables, historical experience, and management judgment. We write off trade receivables against the allowance when management determines a balance is uncollectible and no longer intends to actively pursue collection of the receivable. We record a contract asset when revenue is recognized in advance of invoicing. Contract assets are presented within accounts receivable on the condensed consolidated balance sheets.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Our financial assets and financial liabilities which may include cash equivalents, marketable securities, and restricted cash, are measured and recorded at fair value on a recurring basis. Non-marketable equity securities include our privately held strategic equity securities without readily determinable fair values. We record these privately held strategic equity securities without readily determinable fair values using a measurement alternative which measures the securities at cost minus impairment, if any, plus or minus changes resulting from qualifying observable price changes with a same or similar security from the same issuer. Our non-marketable equity securities are recorded at fair value only if an impairment or observable price adjustment is recognized in the current period. If an observable price adjustment or impairment is recognized on our non-marketable equity securities, we classify these assets as Level 3 within the fair value hierarchy based on the nature of the fair value inputs. Our other current financial assets have fair values which approximate their carrying value due to their short-term maturities.
Stock-Based Compensation	The assumptions used in the Black-Scholes option pricing model were determined as follows: Fair Value of Common Stock . We use the market closing price for our Class A common stock as reported on the New York Stock Exchange to determine the fair value of our common stock at each grant date. Expected Term . The expected term represents the period that our share-based awards are expected to be outstanding. The expected term assumptions were determined based on the vesting terms, exercise terms and contractual lives of the options and 2015 ESPP purchase rights. Expected Volatility . We estimate the expected volatility of the stock option grants and 2015 ESPP purchase rights based on the historical volatility of our Class A common stock over a period equivalent to the expected term of the stock option grants and 2015 ESPP purchase rights, respectively. Risk-free Interest Rate . The risk-free rate that we use is based on the implied yield available on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term on the stock options and 2015 ESPP purchase rights. Dividend Yield . We have never declared or paid any cash dividends and do not plan to pay cash dividends in the foreseeable future, and, therefore, use an expected dividend yield of zero.

Description of Business and B21

Description of Business and Basis of Presentation (Tables)	6 Months Ended
	Jul. 31, 2018
Accounting Standards Update 2014-09
Schedule of Effect of Adoption on Condensed Consolidated Financial Statements	The following table summarizes the adjustments made to account on the condensed consolidated balance sheet as of February 1, 2018 as a result of applying the modified retrospective method to adopt ASC Topic 606 (in thousands): As Reported Adjustments As Adjusted January 31, 2018 Revenue Recognition Incremental Costs of Obtaining a Contract February 1, 2018 Accounts receivable* $ 162,133 $ 582 $ 162,715 Deferred commissions 17,589 $ (3,449 ) 14,140 Deferred commissions, non-current** 8,330 32,855 41,185 Deferred revenue 291,902 (8,483 ) 283,419 Deferred revenue, non-current 29,021 (1,331 ) 27,690 Accumulated deficit (1,039,088 ) 10,396 29,406 (999,286 ) * Contract assets are reported as part of accounts receivable upon the adoption of ASC Topic 606. ** As of January 31, 2018, deferred commissions, non-current was reported as part of other long-term assets. The condensed consolidated balance sheet as of January 31, 2018 was reclassified to conform to the current period presentation.
Accounting Standards Update 2016-18
Schedule of Effect of Adoption on Condensed Consolidated Financial Statements	For the three and six months ended July 31, 2017, the adoption of ASU 2016-18 decreases cash flows from operating activities by $0.2 million as indicated in the table below. Three Months Ended July 31, 2017 Six Months Ended July 31, 2017 As Reported Adjustments As Adjusted As Reported Adjustments As Adjusted Changes in operating assets and liabilities: Prepaid expenses and other assets, current and noncurrent* $ (3,164 ) $ (238 ) $ (3,402 ) $ (5,705 ) $ (238 ) $ (5,943 ) Net cash used in operating activities (9,523 ) (238 ) (9,761 ) (982 ) (238 ) (1,220 ) Net decrease in cash, cash equivalents, and restricted cash (18,416 ) (238 ) (18,654 ) (12,116 ) (238 ) (12,354 ) Cash, cash equivalents, and restricted cash, beginning of period 183,691 26,781 210,472 177,391 26,781 204,172 Cash, cash equivalents, and restricted cash, end of period 165,275 26,543 191,818 165,275 26,543 191,818 * Changes in restricted cash were included as part of prepaid expenses and other assets, current and noncurrent.

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jul. 31, 2018
Accounting Standards Update 2014-09
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Summary of Financial Statement Impact of ASC 606	The following tables present the amount by which each condensed consolidated financial statement line item is affected as of and for the three and six months ended July 31, 2018 by ASC Topic 606 (in thousands, except per share data): July 31, 2018 As Reported Balances without adoption of ASC Topic 606 Effect of Change ASSETS Accounts receivable* $ 114,779 $ 114,622 $ 157 Deferred commissions 16,855 14,623 2,232 Deferred commissions, non-current 44,059 7,041 37,018 LIABILITIES AND STOCKHOLDERS’ EQUITY Deferred revenue 281,765 284,249 (2,484 ) Deferred revenue, non-current 19,752 22,042 (2,290 ) Accumulated deficit (1,074,008 ) (1,118,189 ) 44,181 * Contract assets are reported as part of accounts receivable upon the adoption of ASC Topic 606. Three Months Ended July 31, 2018 Six Months Ended July 31, 2018 As Reported Balances without adoption of ASC Topic 606 Effect of Change As Reported Balances without adoption of ASC Topic 606 Effect of Change Revenue $ 148,222 $ 150,941 $ (2,719 ) $ 288,729 $ 294,194 $ (5,465 ) Operating expenses: Sales and marketing 76,984 82,588 (5,604 ) 153,982 163,826 (9,844 ) Loss from operations (37,219 ) (40,104 ) 2,885 (73,079 ) (77,458 ) 4,379 Net loss (38,085 ) (40,970 ) 2,885 (74,722 ) (79,101 ) 4,379 Net loss per common share, basic and diluted $ (0.27 ) $ (0.29 ) $ 0.02 $ (0.54 ) $ (0.57 ) $ 0.03 Weighted-average shares used to compute net loss per share, basic and diluted 140,718 140,718 140,718 139,639 139,639 139,639 Three Months Ended July 31, 2018 Six Months Ended July 31, 2018 As Reported Balances without adoption of ASC Topic 606 Effect of Change As Reported Balances without adoption of ASC Topic 606 Effect of Change CASH FLOWS FROM OPERATING ACTIVITIES: Net loss $ (38,085 ) $ (40,970 ) $ 2,885 $ (74,722 ) $ (79,101 ) $ 4,379 Adjustments to reconcile net loss to net cash (used in) provided by operating activities: Amortization of deferred commissions 4,040 5,980 (1,940 ) 7,715 11,942 (4,227 ) Changes in operating assets and liabilities: Accounts receivable, net (23,754 ) (23,793 ) 39 47,936 47,511 425 Deferred commissions (8,588 ) (4,924 ) (3,664 ) (13,304 ) (7,687 ) (5,617 ) Deferred revenue 14,568 11,888 2,680 (9,592 ) (14,632 ) 5,040 Net cash (used in) provided by operating activities (1,267 ) (1,267 ) — 17,173 17,173 —

Balance Sheet Components (Table

Balance Sheet Components (Tables)	6 Months Ended
	Jul. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Schedule of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consisted of the following (in thousands): July 31, January 31, 2018 2018 Prepaid expenses $ 13,430 $ 8,494 Other current assets 3,029 2,897 Total prepaid expenses and other current assets $ 16,459 $ 11,391
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): July 31, January 31, 2018 2018 Servers $ 186,205 $ 170,422 Leasehold improvements 75,307 72,599 Computer hardware and software 15,920 14,558 Furniture and fixtures 15,288 14,254 Construction in progress 9,897 7,348 Total property and equipment 302,617 279,181 Less: accumulated depreciation (177,260 ) (155,204 ) Total property and equipment, net $ 125,357 $ 123,977
Schedule of Other Long-Term Assets	Other long-term assets consisted of the following (in thousands): July 31, January 31, 2018 2018 Deposits, non-current $ 2,686 $ 2,934 Other assets, non-current 2,525 2,469 Other long-term assets $ 5,211 $ 5,403

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jul. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Goodwill Activity	Goodwill activity is reflected in the following table (in thousands): Balance as of January 31, 2018 $ 16,293 Goodwill acquired 2,447 Balance as of July 31, 2018 $ 18,740

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jul. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Future Minimum Lease Payments under Non-cancellable Capital and Operating Leases	As of July 31, 2018, future minimum lease payments under non-cancellable capital and operating leases are as follows (in thousands): Years ending January 31: Capital Leases Operating Leases, Sublease Income Remainder of 2019 $ 12,135 $ 17,442 2020 19,343 35,855 2021 15,290 36,576 2022 7,436 34,350 2023 961 26,453 Thereafter — 143,298 Total minimum lease payments $ 55,165 $ 293,974 Less: amount representing interest (2,047 ) Present value of minimum lease payments $ 53,118
Future Payments under Non-cancellable Contractual Purchases	As of July 31, 2018, future payments under non-cancellable contractual purchases, which relate primarily to infrastructure services, datacenter operations, and sales and marketing activities, are as follows (in thousands): Years ending January 31: Remainder of 2019 $ 21,845 2020 46,594 2021 11,383 2022 1,514 2023 851 Thereafter 694 $ 82,881

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jul. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Stock Option Activity Under Equity Incentive Plans and Related Information	The following table summarizes the stock option activity under the equity incentive plans and related information: Shares Weighted-Average Weighted- Remaining Average Exercise Contractual Life Aggregate Shares Price (Years) Intrinsic Value (in thousands) Balance as of January 31, 2018 10,843,120 $ 8.32 5.74 $ 150,922 Options granted 697,686 20.84 Option exercised (1,446,438 ) 8.87 Options forfeited/cancelled (408,689 ) 13.93 Balance as of July 31, 2018 9,685,679 $ 8.90 5.44 $ 146,041 Vested and expected to vest as of July 31, 2018 9,601,241 $ 8.82 5.41 $ 145,527 Exercisable as of July 31, 2018 7,817,955 $ 6.73 4.66 $ 134,679
Summary of Restricted Stock Unit Activity Under Equity Incentive Plans and Related Information	The following table summarizes the restricted stock unit activity under the equity incentive plans and related information: Number of Weighted- Restricted Average Stock Units Grant Date Outstanding Fair Value Unvested balance - January 31, 2018 14,619,252 $ 16.42 Granted 6,968,238 22.26 Vested, net of shares withheld for employee payroll taxes (1,786,786 ) 16.30 Forfeited/cancelled (1,940,121 ) 16.97 Unvested balance - July 31, 2018 17,860,583 $ 18.65
Summary of Components of Stock-Based Compensation Expense	The following table summarizes the components of stock-based compensation expense recognized in the condensed consolidated statements of operations (in thousands): Three Months Ended Six Months Ended July 31, July 31, 2018 2017 2018 2017 Cost of revenue $ 3,561 $ 2,663 $ 6,682 $ 5,131 Research and development 11,477 9,554 21,625 18,714 Sales and marketing 9,932 7,934 17,993 15,674 General and administrative 5,713 3,916 10,996 7,494 Total stock-based compensation $ 30,683 $ 24,067 $ 57,296 $ 47,013
Summary of Estimated Fair Value of Employee Stock Options	We estimated the fair value of employee stock options and 2015 ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions. Three Months Ended Six Months Ended July 31, July 31, 2018 2017 2018 2017 Employee Stock Options Expected term (in years) 5.5 - 5.8 5.5 - 6.0 5.5 - 5.8 5.5 - 6.0 Risk-free interest rate 2.2% - 2.3% 1.8% - 2.0% 2.2% - 2.3% 1.8% - 2.4% Volatility 45% - 45% 38% - 39% 45% - 45% 38% - 40% Dividend yield 0% 0% 0% 0% Employee Stock Purchase Plan Expected term (in years) 0.5 - 2.0 0.5 - 2.0 0.5 - 2.0 0.5 - 2.0 Risk-free interest rate 2.0% - 2.3% 0.9% - 1.4% 2.0% - 2.3% 0.9% - 1.4% Volatility 37% - 50% 28% - 43% 37% - 50% 28% - 43% Dividend yield 0% 0% 0% 0%

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	6 Months Ended
	Jul. 31, 2018
Earnings Per Share [Abstract]
Summary of Computation of Basic and Diluted Net Loss Per Share	The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts): Three Months Ended July 31, 2018 2017 Class A Class B Class A Class B Numerator: Net loss $ (37,001 ) $ (1,084 ) $ (27,909 ) $ (11,376 ) Denominator: Weighted-average number of shares outstanding— basic and diluted 136,712 4,006 94,471 38,510 Net loss per share—basic and diluted $ (0.27 ) $ (0.27 ) $ (0.30 ) $ (0.30 ) Six Months Ended July 31, 2018 2017 Class A Class B Class A Class B Numerator: Net loss $ (70,718 ) $ (4,004 ) $ (50,163 ) $ (29,208 ) Denominator: Weighted-average number of shares outstanding—basic and diluted 132,156 7,483 83,574 48,663 Net loss per share—basic and diluted $ (0.54 ) $ (0.54 ) $ (0.60 ) $ (0.60 )
Summary of Weighted Average Outstanding Shares Excluded from Computation of Diluted Net Loss per Share	The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because the impact of including them would have been antidilutive (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Options to purchase common stock 10,085 12,345 10,301 12,267 Restricted stock units 15,095 13,624 14,313 13,088 Employee stock purchase plan 2,173 1,989 1,841 2,075 Repurchasable shares from early-exercised options and unvested restricted stock — 214 — 227 Contingently issuable common stock — 54 — 56 27,353 28,226 26,455 27,713

Description of Business and B28

Description of Business and Basis of Presentation - Additional Information (Details)	Nov. 29, 2017USD ($)	Jul. 31, 2018USD ($)Customer	Jul. 31, 2017USD ($)Customer		Jul. 31, 2018USD ($)Customer	Jul. 31, 2017USD ($)Customer		Jan. 31, 2018USD ($)Customer	Jan. 31, 2017USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Customer contracts, estimated expected benefit period					5 years
Net cash provided by (used in) operating activities		$ (1,267,000)	$ (9,761,000)	[1]	$ 17,173,000	$ (1,220,000)	[1]
Release and decrease of restricted cash	$ (26,100,000)
Sales commission estimated period of amortization on straight-line basis					5 years
Minimum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Period of subscription and premier services contracts					1 year
Maximum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Period of subscription and premier services contracts					3 years
Previously Reported
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net cash provided by (used in) operating activities			(9,523,000)			(982,000)		$ 61,800,000	$ (1,200,000)
Accounting Standards Update 2016-18
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net cash provided by (used in) operating activities			(9,761,000)			(1,220,000)
Release and decrease of restricted cash			(200,000)			(200,000)
Accounting Standards Update 2016-18 | Adjustment
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net cash provided by (used in) operating activities			$ (238,000)			$ (238,000)		$ 35,400,000	$ (2,400,000)
Accounting Standards Update 2016-01
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Impairment adjustment on investments		0			$ 0
Accounting Standards Update 2016-01 | Reported Value Measurement | Other Long-Term Assets
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Investments on equity securities		$ 100,000			$ 100,000
Credit Concentration Risk | Accounts Receivable
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of major customer | Customer		0			0			1
Concentration risk percentage					10.00%			10.00%
Customer Concentration Risk | Revenue
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of major customer | Customer		1	0		1	0
Concentration risk percentage		10.00%	10.00%		10.00%	10.00%
Geographic Concentration Risk | Revenue | Non-U.S.
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage		24.00%	21.00%		24.00%	21.00%
Geographic Concentration Risk | Revenue | United States
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage		76.00%	79.00%		76.00%	79.00%
Geographic Concentration Risk | Property and Equipment | United States
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage					91.00%			95.00%
[1]	Adjusted due to the adoption of ASU 2016-18

Description of Business and B29

Description of Business and Basis of Presentation - Schedule of Adjustments made to Account on Condensed Consolidated Balance Sheet as a Result of Applying Retrospective Method (Details) - USD ($) $ in Thousands		Jul. 31, 2018	Feb. 01, 2018	Jan. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Accounts receivable	[1]	$ 114,779		$ 162,133
Deferred commissions		16,855		17,589
Deferred commissions, non-current		44,059		8,330	[2]
Deferred revenue		281,765		291,902
Deferred revenue, non-current		19,752		29,021
Accumulated deficit		$ (1,074,008)		$ (1,039,088)
Accounting Standards Update 2014-09
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Accounts receivable	[1]		$ 162,715
Deferred commissions			14,140
Deferred commissions, non-current	[2]		41,185
Deferred revenue			283,419
Deferred revenue, non-current			27,690
Accumulated deficit			(999,286)
Accounting Standards Update 2014-09 | Effect of Adoption of ASU Topic 606 | Revenue Recognition
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Accounts receivable	[1]		582
Deferred revenue			(8,483)
Deferred revenue, non-current			(1,331)
Accumulated deficit			10,396
Accounting Standards Update 2014-09 | Effect of Adoption of ASU Topic 606 | Incremental Costs of Obtaining a Contract
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Deferred commissions			(3,449)
Deferred commissions, non-current	[2]		32,855
Accumulated deficit			$ 29,406
[1]	Contract assets are reported as part of accounts receivable upon the adoption of ASC Topic 606.
[2]	As of January 31, 2018, deferred commissions, non-current was reported as part of other long-term assets. The condensed consolidated balance sheet as of January 31, 2018 was reclassified to conform to the current period presentation.

Description of Business and B30

Description of Business and Basis of Presentation - Schedule of Decreases Cash Flows from Operating Activities Due to Adoption of ASU 2016-18 (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended			12 Months Ended
		Jul. 31, 2018	Jul. 31, 2017		Jul. 31, 2018	Jul. 31, 2017		Jan. 31, 2018	Jan. 31, 2017
Changes in operating assets and liabilities:
Prepaid expenses and other assets, current and noncurrent		$ 267	$ (3,402)	[1]	$ (4,933)	$ (5,943)	[1]
Net cash used in operating activities		(1,267)	(9,761)	[1]	17,173	(1,220)	[1]
Net decrease in cash, cash equivalents, and restricted cash		(13,502)	(18,654)	[1]	(4,462)	(12,354)	[1]
Cash, cash equivalents, and restricted cash, beginning of period		217,466	210,472		208,426	204,172		$ 204,172
Cash, cash equivalents, and restricted cash, end of period		$ 203,964	191,818		$ 203,964	191,818		208,426	$ 204,172
As Reported
Changes in operating assets and liabilities:
Prepaid expenses and other assets, current and noncurrent	[2]		(3,164)			(5,705)
Net cash used in operating activities			(9,523)			(982)		61,800	(1,200)
Net decrease in cash, cash equivalents, and restricted cash			(18,416)			(12,116)
Cash, cash equivalents, and restricted cash, beginning of period			183,691			177,391		177,391
Cash, cash equivalents, and restricted cash, end of period			165,275			165,275			177,391
Accounting Standards Update 2016-18
Changes in operating assets and liabilities:
Prepaid expenses and other assets, current and noncurrent	[2]		(3,402)			(5,943)
Net cash used in operating activities			(9,761)			(1,220)
Net decrease in cash, cash equivalents, and restricted cash			(18,654)			(12,354)
Cash, cash equivalents, and restricted cash, beginning of period			210,472			204,172		204,172
Cash, cash equivalents, and restricted cash, end of period			191,818			191,818			204,172
Accounting Standards Update 2016-18 | Adjustments
Changes in operating assets and liabilities:
Prepaid expenses and other assets, current and noncurrent	[2]		(238)			(238)
Net cash used in operating activities			(238)			(238)		35,400	(2,400)
Net decrease in cash, cash equivalents, and restricted cash			(238)			(238)
Cash, cash equivalents, and restricted cash, beginning of period			26,781			26,781		$ 26,781
Cash, cash equivalents, and restricted cash, end of period			$ 26,543			$ 26,543			$ 26,781
[1]	Adjusted due to the adoption of ASU 2016-18
[2]	Changes in restricted cash were included as part of prepaid expenses and other assets, current and noncurrent.

Revenue - Financial Statement I

Revenue - Financial Statement Impact of ASC 606 (Balance Sheet) (Details) - USD ($) $ in Thousands		Jul. 31, 2018	Jan. 31, 2018
ASSETS
Accounts receivable	[1]	$ 114,779	$ 162,133
Deferred commissions		16,855	17,589
Deferred commissions, non-current		44,059	8,330	[2]
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue		281,765	291,902
Deferred revenue, non-current		19,752	29,021
Accumulated deficit		(1,074,008)	$ (1,039,088)
Balances without adoption of ASC Topic 606 | Accounting Standards Update 2014-09
ASSETS
Accounts receivable	[1]	114,622
Deferred commissions		14,623
Deferred commissions, non-current		7,041
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue		284,249
Deferred revenue, non-current		22,042
Accumulated deficit		(1,118,189)
Effect of Change | Accounting Standards Update 2014-09
ASSETS
Accounts receivable	[1]	157
Deferred commissions		2,232
Deferred commissions, non-current		37,018
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue		(2,484)
Deferred revenue, non-current		(2,290)
Accumulated deficit		$ 44,181
[1]	Contract assets are reported as part of accounts receivable upon the adoption of ASC Topic 606.
[2]	As of January 31, 2018, deferred commissions, non-current was reported as part of other long-term assets. The condensed consolidated balance sheet as of January 31, 2018 was reclassified to conform to the current period presentation.

Revenue - Financial Statement32

Revenue - Financial Statement Impact of ASC 606 (Income Statement) (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
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Revenue	$ 148,222	$ 122,941	$ 288,729	$ 240,163
Operating expenses:
Sales and marketing	76,984	73,271	153,982	143,934
Loss from operations	(37,219)	(38,996)	(73,079)	(78,975)
Net loss	$ (38,085)	$ (39,285)	$ (74,722)	$ (79,371)
Net loss per common share, basic and diluted	$ (0.27)	$ (0.30)	$ (0.54)	$ (0.60)
Weighted-average shares used to compute net loss per share, basic and diluted	140,718	132,981	139,639	132,237
Balances without adoption of ASC Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Revenue	$ 150,941		$ 294,194
Operating expenses:
Sales and marketing	82,588		163,826
Loss from operations	(40,104)		(77,458)
Net loss	$ (40,970)		$ (79,101)
Net loss per common share, basic and diluted	$ (0.29)		$ (0.57)
Weighted-average shares used to compute net loss per share, basic and diluted	140,718		139,639
Effect of Change | Accounting Standards Update 2014-09
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Revenue	$ (2,719)		$ (5,465)
Operating expenses:
Sales and marketing	(5,604)		(9,844)
Loss from operations	2,885		4,379
Net loss	$ 2,885		$ 4,379
Net loss per common share, basic and diluted	$ 0.02		$ 0.03
Weighted-average shares used to compute net loss per share, basic and diluted	140,718		139,639

Revenue - Financial Statement33

Revenue - Financial Statement Impact of ASC 606 (Cash Flow) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017		Jul. 31, 2018	Jul. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (38,085)	$ (39,285)		$ (74,722)	$ (79,371)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Amortization of deferred commissions	4,040	5,368		7,715	10,358
Changes in operating assets and liabilities:
Accounts receivable, net	(23,754)	(25,124)		47,936	12,222
Deferred commissions	(8,588)	(5,835)		(13,304)	(8,619)
Deferred revenue	14,568	16,524		(9,592)	(1,145)
Net cash provided by (used in) operating activities	(1,267)	$ (9,761)	[1]	17,173	$ (1,220)	[1]
Balances without adoption of ASC Topic 606 | Accounting Standards Update 2014-09
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	(40,970)			(79,101)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Amortization of deferred commissions	5,980			11,942
Changes in operating assets and liabilities:
Accounts receivable, net	(23,793)			47,511
Deferred commissions	(4,924)			(7,687)
Deferred revenue	11,888			(14,632)
Net cash provided by (used in) operating activities	(1,267)			17,173
Effect of Change | Accounting Standards Update 2014-09
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	2,885			4,379
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Amortization of deferred commissions	(1,940)			(4,227)
Changes in operating assets and liabilities:
Accounts receivable, net	39			425
Deferred commissions	(3,664)			(5,617)
Deferred revenue	$ 2,680			$ 5,040
[1]	Adjusted due to the adoption of ASU 2016-18

Revenues - Additional Informati

Revenues - Additional Information (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jul. 31, 2018USD ($)	Jul. 31, 2018USD ($)
Revenue From Contract With Customer [Abstract]
Contract assets presented within accounts receivable	$ 0.2	$ 0.2
Deferred revenue	301.5	301.5
Deferred revenue, revenue recognized out of beginning balance	115.2	197.6
Remaining performance obligation, revenue expected to be recognized	$ 587.2	$ 587.2
Revenue remaining performance obligation, percentage	66.00%	66.00%

Revenues - Additional Informa35

Revenues - Additional Information (Details 1)	Jul. 31, 2018
Revenue From Contract With Customer [Abstract]
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid expenses	$ 13,430	$ 8,494
Other current assets	3,029	2,897
Total prepaid expenses and other current assets	$ 16,459	$ 11,391

Balance Sheet Components - Sc37

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 302,617	$ 279,181
Less: accumulated depreciation	(177,260)	(155,204)
Total property and equipment, net	125,357	123,977
Servers
Property Plant And Equipment [Line Items]
Total property and equipment, gross	186,205	170,422
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property and equipment, gross	75,307	72,599
Computer hardware and software
Property Plant And Equipment [Line Items]
Total property and equipment, gross	15,920	14,558
Furniture and fixtures
Property Plant And Equipment [Line Items]
Total property and equipment, gross	15,288	14,254
Construction in progress
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 9,897	$ 7,348

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (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
Property Plant And Equipment [Line Items]
Accumulated depreciation of property and equipment acquired under capital lease	$ 41.4		$ 41.4		$ 29.1
Depreciation expense	11.8	$ 9.7	23.2	$ 18.9
Servers
Property Plant And Equipment [Line Items]
Gross amount of property and equipment acquired under capital lease	91.1		91.1		74.7
Depreciation expense	6.4	$ 4.6	12.3	$ 8.4
Construction in progress
Property Plant And Equipment [Line Items]
Gross amount of property and equipment acquired under capital lease	$ 6.8		$ 6.8		$ 3.7

Balance Sheet Components - Sc39

Balance Sheet Components - Schedule of Other Long-Term Assets (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Assets Noncurrent [Abstract]
Deposits, non-current	$ 2,686	$ 2,934
Other assets, non-current	2,525	2,469
Other long-term assets	$ 5,211	$ 5,403

Business Combinations - Additio

Business Combinations - Additional Information (Details) $ in Millions	3 Months Ended
	Jul. 31, 2018USD ($)
Three Privately-held Technology Companies
Business Acquisition [Line Items]
Business acquisition, aggregate consideration paid	$ 2.4

Goodwill and Intangible Asset41

Goodwill and Intangible Assets - Summary of Goodwill Activity (Details) $ in Thousands	6 Months Ended
	Jul. 31, 2018USD ($)
Goodwill - Roll forward
Beginning Balance	$ 16,293
Goodwill acquired	2,447
Ending Balance	$ 18,740

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (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	Nov. 27, 2017
Commitments And Contingencies [Line Items]
Non-cancellable sublease expiration year			2,023
Rent expense	$ 8.3	$ 6.9	$ 16.6	$ 12.2
Sublease income	2.1	$ 1.9	4	$ 3.7
Subleases Expire in Fiscal 2018 and 2023
Commitments And Contingencies [Line Items]
Non-cancellable sublease proceeds for the year ending January 31, 2019	3.8		3.8
Non-cancellable sublease proceeds for the year ending January 31, 2020	7.7		7.7
Non-cancellable sublease proceeds for the year ending January 31, 2021	7		7
Non-cancellable sublease proceeds for the year ending January 31, 2022	5		5
Non-cancellable sublease proceeds for the year ending January 31, 2023	4.2		$ 4.2
Minimum
Commitments And Contingencies [Line Items]
Operating lease expiration year			2,020
Capital lease initial term			3 years
Term of sublease arrangement			25 months
Maximum
Commitments And Contingencies [Line Items]
Operating lease expiration year			2,029
Capital lease initial term			4 years
Term of sublease arrangement			55 months
November 2017 Facility | Letters of Credit | Secured Debt | Wells Fargo Bank
Commitments And Contingencies [Line Items]
Agreement entered date			Nov. 27, 2017
Letters of credit facility	$ 26.8		$ 26.8		$ 26.4
Line of credit facility, maximum borrowing capacity sublimit						$ 30

Commitments and Contingencies43

Commitments and Contingencies - Future Minimum Lease Payments under Non-cancellable Capital and Operating Leases (Details) $ in Thousands	Jul. 31, 2018USD ($)
Capital Leases
Capital Leases, Remainder of 2019	$ 12,135
Capital Leases, 2020	19,343
Capital Leases, 2021	15,290
Capital Leases, 2022	7,436
Capital Leases, 2023	961
Capital Leases, Total minimum lease payments	55,165
Capital Leases, Less: amount representing interest	(2,047)
Capital Leases, Present value of minimum lease payments	53,118
Operating Leases
Operating Leases, net of Sublease Income, Remainder of 2019	17,442
Operating Leases, net of Sublease Income, 2020	35,855
Operating Leases, net of Sublease Income, 2021	36,576
Operating Leases, net of Sublease Income, 2022	34,350
Operating Leases, net of Sublease Income, 2023	26,453
Operating Leases, net of Sublease Income, Thereafter	143,298
Operating Leases, net of Sublease Income, Total minimum lease payments	$ 293,974

Commitments and Contingencies44

Commitments and Contingencies - Future Payments under Non-cancellable Contractual Purchases (Details) $ in Thousands	Apr. 30, 2018USD ($)
Purchase Obligation Fiscal Year Maturity [Abstract]
Remainder of 2019	$ 21,845
2,020	46,594
2,021	11,383
2,022	1,514
2,023	851
Thereafter	694
Total	$ 82,881

Debt - Additional Information (

Debt - Additional Information (Details) - USD ($)	Nov. 29, 2017	Nov. 27, 2017	Feb. 28, 2017	Dec. 31, 2015	Jul. 31, 2018
Debt Instrument [Line Items]
Decrease in restricted cash	$ 26,100,000
December 2015 Facility | Revolving Credit Facility | Secured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 40,000,000
Line of credit facility maturity date			Dec. 31, 2018	Dec. 31, 2017
Repayment of outstanding principal balance				$ 40,000,000
Line of credit facility, termination date				Nov. 27, 2017
Line of credit facility, floating interest rate				1.25%
Debt instrument, description of variable rate basis					The December 2015 Facility was denominated in U.S. dollars and, depending on certain conditions, each borrowing was subject to a floating interest rate equal to either the prime rate plus a spread of 0.25% to 2.75% or a reserve adjusted LIBOR rate (based on one, three or six-month interest periods) plus a spread of 1.25% to 3.75%.
Line of credit facility, commitment fee percentage				0.20%
Line of credit facility, amount drawn				$ 40,000,000
Line of credit facility, interest rate				1.82%
December 2015 Facility | Revolving Credit Facility | Secured Debt | Minimum
Debt Instrument [Line Items]
Minimum deposit held as collateral for line of credit				$ 0
Minimum deposit amount with lender				$ 40,000,000
December 2015 Facility | Revolving Credit Facility | Secured Debt | Minimum | Prime Rate
Debt Instrument [Line Items]
Line of credit facility, floating interest rate				0.25%
December 2015 Facility | Revolving Credit Facility | Secured Debt | Minimum | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit facility, floating interest rate				1.25%
December 2015 Facility | Revolving Credit Facility | Secured Debt | Maximum | Prime Rate
Debt Instrument [Line Items]
Line of credit facility, floating interest rate				2.75%
December 2015 Facility | Revolving Credit Facility | Secured Debt | Maximum | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit facility, floating interest rate				3.75%
November 2017 Facility | Secured Debt | Wells Fargo Bank
Debt Instrument [Line Items]
Line of credit facility maturity date		Nov. 27, 2020
November 2017 Facility | Revolving Credit Facility | Secured Debt | Wells Fargo Bank
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 85,000,000
Line of credit facility, interest payment terms					Interest on the revolving loans is payable quarterly in arrears with respect to loans based on the prime rate and at the end of an interest period in the case of loans based on the LIBOR rate (or at each three-month interval if the interest period is longer than three months).
November 2017 Facility | Revolving Credit Facility | Secured Debt | Wells Fargo Bank | Prime Rate
Debt Instrument [Line Items]
Line of credit facility, floating interest rate		0.25%
November 2017 Facility | Revolving Credit Facility | Secured Debt | Wells Fargo Bank | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit facility, floating interest rate		1.00%
November 2017 Facility | Letter of Credit | Secured Debt | Wells Fargo Bank
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity sublimit		$ 30,000,000

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - $ / shares	Jun. 15, 2018	Jul. 31, 2018	Jun. 14, 2018	Jan. 31, 2018
Class Of Stock [Line Items]
Common Stock, conversion features		On June 14, 2018, all of our outstanding shares of Class B common stock automatically converted into the same number of shares of Class A common stock pursuant to the terms of our Amended and Restated Certificate of Incorporation. No additional shares of Class B common stock will be issued following such conversion. The conversion occurred pursuant to Article IV of the Amended and Restated Certificate of Incorporation, which provided that each one share of Class B common stock would convert automatically, without any further action, into one share of Class A common stock on the first trading day falling on or after the date on which the outstanding shares of Class B common stock represent less than 5% of the aggregate number of shares of the then outstanding Class A common stock and Class B common stock.
Preferred stock, shares authorized		100,000,000		100,000,000
Preferred stock, par value		$ 0.0001		$ 0.0001
Preferred stock, shares issued		0		0
Preferred stock, shares outstanding		0		0
Class B Common Stock
Class Of Stock [Line Items]
Maximum percentage of outstanding shares of Class A and Class B common stock, for automatic conversion of shares of Class B common stock			5.00%
Additional common shares issued			0
Reduction in number of authorized shares of common stock	200,000,000
Common Stock, shares authorized				200,000,000
Common Stock, par value				$ 0.0001
Common Stock, shares issued				11,383,525
Common Stock, shares outstanding				11,383,525
Class A Common Stock
Class Of Stock [Line Items]
Common Stock, shares authorized		1,000,000,000		1,000,000,000
Common Stock, par value		$ 0.0001		$ 0.0001
Common Stock, shares issued		141,605,601		125,933,323
Common Stock, shares outstanding		141,605,601		125,933,323

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended			6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jul. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate intrinsic value of exercised options						$ 22.5	$ 11.2
Aggregate estimated fair value of stock options granted to employees vested						3.9	$ 4.8
Unrecognized stock-based compensation expense related to stock option			$ 11.1			$ 11.1
Remaining weighted-average period						2 years 8 months 26 days
Stock options forfeited						408,689
Performance-Based Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock-based compensation expense related to stock option			4.7			$ 4.7
Remaining weighted-average period						3 years 6 months 14 days
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining weighted-average period						3 years 1 month 9 days
Unrecognized stock-based compensation expense			$ 261.8			$ 261.8
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend yield			0.00%		0.00%	0.00%	0.00%
Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average grant date fair value of options granted to employees						$ 8.23	$ 6.82
2015 Equity Incentive Plan | Performance-Based Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted	650,000	475,000
Stock options forfeited				250,000
2015 Equity Incentive Plan | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares common stock reserved for issuance			19,348,110			19,348,110		12,200,000
2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares common stock reserved for issuance			2,571,580			2,571,580
Percentage of eligible compensation allowed to employees to purchase shares at a discount			15.00%			15.00%
Description of offering period						The 2015 ESPP provides for 24-month offering periods beginning March 16 and September 16 of each year, and each offering period consists of four six-month purchase periods.
Purchase price of common stock, percentage						85.00%
Description of offering period resets						the offering period resets and the new lower price becomes the new offering price for a new 24 month offering period.
Unrecognized stock-based compensation expense			$ 11.8			$ 11.8
Dividend yield			0.00%		0.00%	0.00%	0.00%
2015 Employee Stock Purchase Plan | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares common stock reserved for issuance								2,500,000
Vesting Commencement Per Year | 2015 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options and restricted stock units vesting percentage						25.00%
Vesting Commencement Per Year | 2015 Equity Incentive Plan | Performance-Based Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options and restricted stock units vesting percentage	25.00%
Vesting Commencement Per Month
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options and restricted stock units vesting percentage						2.08%
Vesting Commencement Per Month | 2015 Equity Incentive Plan | Performance-Based Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options and restricted stock units vesting percentage	2.08%
Vesting Commencement Per Quarter
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options and restricted stock units vesting percentage						6.25%

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock Option Activity Under Equity Incentive Plans and Related Information (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2018	Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Subject to Options Outstanding, Beginning balance	10,843,120
Shares Subject to Options Outstanding, Options granted	697,686
Shares Subject to Options Outstanding, Options exercised	(1,446,438)
Shares Subject to Options Outstanding, Options forfeited/cancelled	(408,689)
Shares Subject to Options Outstanding, Ending balance	9,685,679	10,843,120
Shares Subject to Options Outstanding, Vested and expected to vest	9,601,241
Shares Subject to Options Outstanding, Exercisable	7,817,955
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Beginning Balance	$ 8.32
Weighted Average Exercise Price, Options granted	20.84
Weighted Average Exercise Price, Options exercised	8.87
Weighted Average Exercise Price, Options forfeited/cancelled	13.93
Weighted Average Exercise Price, Ending Balance	8.90	$ 8.32
Weighted Average Exercise Price, Vested and expected to vest	8.82
Weighted Average Exercise Price, Exercisable	$ 6.73
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Life (Years)	5 years 5 months 8 days	5 years 8 months 26 days
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest	5 years 4 months 28 days
Weighted Average Remaining Contractual Life (Years), Exercisable	4 years 7 months 28 days
Aggregate Intrinsic Value, Balance	$ 146,041	$ 150,922
Aggregate Intrinsic Value, Vested and expected to vest	145,527
Aggregate Intrinsic Value, Exercisable	$ 134,679

Stock-Based Compensation - Su49

Stock-Based Compensation - Summary of Restricted Stock Unit and Awards Activity Under Equity Incentive Plans and Related Information (Details) - Restricted Stock Units	6 Months Ended
	Jul. 31, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of Restricted Stock Units/Awards Outstanding, Unvested Beginning Balance | shares	14,619,252
Number of Restricted Stock Units/Awards Outstanding Granted | shares	6,968,238
Number of Restricted Stock Units/Awards Outstanding, Vested | shares	(1,786,786)
Number of Restricted Stock Units/Awards Outstanding, Forfeited/cancelled | shares	(1,940,121)
Number of Restricted Stock Units/Awards Outstanding Unvested Ending Balance | shares	17,860,583
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Grant Date Fair Value, Unvested Beginning Balance | $ / shares	$ 16.42
Weighted-Average Grant Date Fair Value, Granted | $ / shares	22.26
Weighted-Average Grant Date Fair Value, Vested | $ / shares	16.30
Weighted-Average Grant Date Fair Value, Forfeited/cancelled | $ / shares	16.97
Weighted-Average Grant Date Fair Value, Unvested Ending Balance | $ / shares	$ 18.65

Stock-Based Compensation - Su50

Stock-Based Compensation - Summary of Components of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 30,683	$ 24,067	$ 57,296	$ 47,013
Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	3,561	2,663	6,682	5,131
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	11,477	9,554	21,625	18,714
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	9,932	7,934	17,993	15,674
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 5,713	$ 3,916	$ 10,996	$ 7,494

Stock-Based Compensation - Su51

Stock-Based Compensation - Summary of Estimated Fair Value of Employee Stock Options (Details)	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate, Minimum	2.00%	0.90%	2.00%	0.90%
Risk-free interest rate, Maximum	2.30%	1.40%	2.30%	1.40%
Volatility, Minimum	37.00%	28.00%	37.00%	28.00%
Volatility, Maximum	50.00%	43.00%	50.00%	43.00%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Minimum | 2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 months	6 months	6 months	6 months
Maximum | 2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	2 years	2 years	2 years	2 years
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate, Minimum	2.20%	1.80%	2.20%	1.80%
Risk-free interest rate, Maximum	2.30%	2.00%	2.30%	2.40%
Volatility, Minimum	45.00%	38.00%	45.00%	38.00%
Volatility, Maximum	45.00%	39.00%	45.00%	40.00%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Employee Stock Option | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	5 years 6 months	5 years 6 months	5 years 6 months	5 years 6 months
Employee Stock Option | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	5 years 9 months 18 days	6 years	5 years 9 months 18 days	6 years

Net Loss per Share - Additional

Net Loss per Share - Additional Information (Details)	Jun. 14, 2018shares
Class B Common Stock
Class Of Stock [Line Items]
Additional common shares issued	0

Net Loss per Share - Summary of

Net Loss per Share - Summary of Computation of Basic and Diluted 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	$ (38,085)	$ (39,285)	$ (74,722)	$ (79,371)
Denominator:
Weighted-average number of shares outstanding— basic and diluted	140,718	132,981	139,639	132,237
Net loss per share—basic and diluted	$ (0.27)	$ (0.30)	$ (0.54)	$ (0.60)
Class A Common Stock
Numerator:
Net loss	$ (37,001)	$ (27,909)	$ (70,718)	$ (50,163)
Denominator:
Weighted-average number of shares outstanding— basic and diluted	136,712	94,471	132,156	83,574
Net loss per share—basic and diluted	$ (0.27)	$ (0.30)	$ (0.54)	$ (0.60)
Class B Common Stock
Numerator:
Net loss	$ (1,084)	$ (11,376)	$ (4,004)	$ (29,208)
Denominator:
Weighted-average number of shares outstanding— basic and diluted	4,006	38,510	7,483	48,663
Net loss per share—basic and diluted	$ (0.27)	$ (0.30)	$ (0.54)	$ (0.60)

Net Loss per Share - Summary 54

Net Loss per Share - Summary of Weighted Average Outstanding Shares Excluded from Computation of Diluted Net Loss per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	27,353	28,226	26,455	27,713
Options to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	10,085	12,345	10,301	12,267
Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	15,095	13,624	14,313	13,088
Repurchasable shares from early-exercised options and unvested restricted stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		214		227
Contingently issuable common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		54		56
Employee stock purchase plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,173	1,989	1,841	2,075

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	7 Months Ended	11 Months Ended
	Jul. 31, 2018	Dec. 31, 2017	Feb. 01, 2018
Income Tax Disclosure [Line Items]
Federal corporate tax rate	21.00%	34.00%
Deferred revenue	$ 301.5
Accounting Standards Update 2014-09 | Effect of Adoption of ASU Topic 606 | Revenue Recognition
Income Tax Disclosure [Line Items]
Deferred revenue			$ (9.8)
Accounting Standards Update 2014-09 | Effect of Adoption of ASU Topic 606 | Incremental Costs of Obtaining a Contract
Income Tax Disclosure [Line Items]
Deferred commission			$ 29.4

Segments - Additional Informati

Segments - Additional Information (Details)	6 Months Ended
	Jul. 31, 2018Segment
Segment Reporting [Abstract]
Number of operating segments	1