Slack (WORK) 10-Q 3 Jun 21 2022 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Apr. 30, 2021	May 14, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Apr. 30, 2021
Document Transition Report	false
Entity File Number	001-38926
Entity Registrant Name	Slack Technologies, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-4400325
Entity Address, Address Line One	500 Howard Street
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94105
City Area Code	415
Local Phone Number	630-7943
Title of 12(b) Security	Class A Common Stock, $0.0001 par value per share
Trading Symbol	WORK
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001764925
Current Fiscal Year End Date	--01-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Amendment Flag	false
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		511,691,054
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		75,023,976

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Current assets:
Cash and cash equivalents	$ 1,332,649	$ 1,081,357
Marketable securities	308,464	505,895
Accounts receivable, net	141,543	237,439
Prepaid expenses and other current assets	58,446	59,702
Total current assets	1,841,102	1,884,393
Restricted cash	38,490	38,490
Strategic investments	114,026	68,161
Property and equipment, net	82,136	87,908
Operating lease right-of-use assets	212,479	219,195
Intangible assets, net	16,173	17,885
Goodwill	76,204	76,204
Other assets	41,720	41,464
Total assets	2,422,330	2,433,700
Current liabilities:
Accounts payable	15,149	13,145
Accrued compensation and benefits	57,261	108,868
Accrued expenses and other current liabilities	25,401	29,864
Operating lease liability	36,023	34,930
Deferred revenue	515,573	510,311
Total current liabilities	649,407	697,118
Convertible senior notes, net	662,224	651,398
Operating lease liability, noncurrent	219,486	225,266
Deferred revenue, noncurrent	198	294
Other liabilities	2,145	2,183
Total liabilities	1,533,460	1,576,259
Commitments and contingencies (Note 7)
Stockholders’ equity:
Common stock	59	58
Additional paid-in-capital	2,453,908	2,371,676
Accumulated other comprehensive income (loss)	(109)	102
Accumulated deficit	(1,564,988)	(1,537,043)
Total Slack Technologies, Inc. stockholders’ equity	888,870	834,793
Noncontrolling interest	0	22,648
Total stockholders’ equity	888,870	857,441
Total liabilities and stockholders’ equity	$ 2,422,330	$ 2,433,700

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Income Statement [Abstract]
Revenue	$ 273,357	$ 201,650
Cost of revenue	39,237	25,602
Gross profit	234,120	176,048
Operating expenses:
Research and development	103,602	91,225
Sales and marketing	123,947	110,320
General and administrative	61,848	50,654
Total operating expenses	289,397	252,199
Loss from operations	(55,277)	(76,151)
Interest expense	(12,029)	(2,842)
Interest income and other income, net	40,426	4,708
Loss before income taxes	(26,880)	(74,285)
Provision for income taxes	1,065	142
Net loss	(27,945)	(74,427)
Net income attributable to noncontrolling interest	0	784
Net loss attributable to Slack	$ (27,945)	$ (75,211)
Basic and diluted net loss per share:
Net loss per share attributable to Slack common stockholders, basic (in dollars per share)	$ (0.05)	$ (0.13)
Net loss per share attributable to Slack common stockholders, diluted (in dollars per share)	$ (0.05)	$ (0.13)
Weighted-average shares used in computing net loss per share attributable to Slack common stockholders, basic (in shares)	581,550	557,414
Weighted-average shares used in computing net loss per share attributable to Slack common stockholders, diluted (in shares)	581,550	557,414

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (27,945)	$ (74,427)
Other comprehensive income (loss), net of tax:
Change in unrealized gain or loss on marketable securities	(211)	925
Other comprehensive income (loss), net of tax	(211)	925
Comprehensive loss	(28,156)	(73,502)
Comprehensive income attributable to noncontrolling interest	0	784
Comprehensive loss attributable to Slack	$ (28,156)	$ (74,286)

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In-Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Noncontrolling Interest
Beginning of period (in shares) at Jan. 31, 2020		555,360
Beginning of period at Jan. 31, 2020	$ 723,899	$ 56	$ 1,945,446	$ (71)	$ (1,236,621)	$ 15,089
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)		1,062
Exercise of stock options	1,932		1,932
Vesting of early exercised stock options	2		2
Issuance of common stock upon settlement of restricted stock units (RSUs) (in shares)		4,724
Equity component of convertible senior notes, net of issuance costs	223,622		223,622
Purchases of capped calls related to convertible senior notes	(105,570)		(105,570)
Other comprehensive income (loss)	925			925
Issuance of common stock for employee share purchase plan (in shares)		820
Issuance of common stock for employee share purchase plan	16,610		16,610
Stock-based compensation	53,711		53,711
Net income (loss)	(74,427)				(75,211)	784
End of period (in shares) at Apr. 30, 2020		561,966
End of period at Apr. 30, 2020	840,704	$ 56	2,135,753	854	(1,311,832)	15,873
Beginning of period (in shares) at Jan. 31, 2021		580,585
Beginning of period at Jan. 31, 2021	$ 857,441	$ 58	2,371,676	102	(1,537,043)	22,648
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	257	257
Exercise of stock options	$ 1,333		1,333
Vesting of early exercised stock options	1,424		1,424
Issuance of common stock upon settlement of restricted stock units (RSUs) (in shares)		4,155
Issuance of common stock upon settlement of restricted stock units (RSUs)	$ 0	$ 1	(1)
Cancellation of restricted stock awards (RSAs) (in shares)	(23)
Other comprehensive income (loss)	$ (211)			(211)
Issuance of common stock for employee share purchase plan (in shares)		757
Issuance of common stock for employee share purchase plan	20,459		20,459
Stock-based compensation	59,017		59,017
Purchase of noncontrolling interest	(22,648)					(22,648)
Net income (loss)	(27,945)				(27,945)
End of period (in shares) at Apr. 30, 2021		585,731
End of period at Apr. 30, 2021	$ 888,870	$ 59	$ 2,453,908	$ (109)	$ (1,564,988)	$ 0

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Cash flows from operating activities:
Net loss	$ (27,945)	$ (74,427)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	7,480	6,700
Stock-based compensation	59,017	53,711
Amortization of debt discount and issuance costs	10,825	2,366
Non-cash operating lease expense	10,339	8,732
Amortization of deferred contract acquisition costs	5,060	3,143
Net amortization of bond premium on debt securities available for sale	1,001	171
Change in fair value of strategic investments	(39,893)	(1,638)
Other non-cash adjustments	676	592
Changes in operating assets and liabilities:
Accounts receivable	95,627	39,470
Prepaid expenses and other assets	(4,069)	(6,561)
Accounts payable	2,004	(3,746)
Operating lease liabilities	(8,310)	(8,671)
Accrued compensation and benefits	(51,607)	(13,328)
Deferred revenue	5,167	4,359
Other current and long-term liabilities	(2,617)	(2,144)
Net cash provided by operating activities	62,755	8,729
Cash flows from investing activities:
Purchases of marketable securities	0	(100,302)
Maturities of marketable securities	196,220	69,613
Sales of marketable securities	0	4,289
Purchases of property and equipment	(50)	(5,046)
Purchase of strategic investments	(5,972)	(4,018)
Net cash provided by (used in) investing activities	190,198	(35,464)
Cash flows from financing activities:
Proceeds from issuance of convertible senior notes, net of issuance costs	0	842,016
Purchases of capped calls related to convertible senior notes	0	(105,570)
Purchase of noncontrolling interest	(22,648)	0
Proceeds from exercise of stock options	1,328	2,905
Payments of contingent consideration for acquisitions	(800)	0
Issuance of common stock for employee stock purchase plan	20,459	16,610
Net cash provided by (used in) financing activities	(1,661)	755,961
Net increase in cash, cash equivalents and restricted cash	251,292	729,226
Cash, cash equivalents and restricted cash at beginning of period	1,119,847	537,489
Cash, cash equivalents and restricted cash at end of period	1,371,139	1,266,715
Supplemental disclosure of cash flow information:
Cash paid for income taxes	494	990
Cash paid for interest	2,156	0
Non-cash investing and financing activities:
Increase (decrease) in purchases of property and equipment included in liabilities	142	(177)
Debt issuance costs, accrued but not yet paid	0	687
Vesting of early exercised stock options	1,424	2
Unrealized short-term gain (loss) on marketable securities	$ (211)	$ 910

Description of Business and Sum

Description of Business and Summary of Significant Accounting Policies	3 Months Ended
	Apr. 30, 2021
Accounting Policies [Abstract]
Description of Business and Summary of Significant Accounting Policies	Description of Business and Summary of Significant Accounting Policies Business Slack Technologies, Inc. (the “Company” or “Slack”) operates a business technology software platform that brings together people, applications, and data and sells its offering under a software-as-a-service model. The Company was incorporated in Delaware in 2009 as Tiny Speck, Inc. In 2014, the Company changed its name to Slack Technologies, Inc. and publicly launched its current offering. The Company is headquartered in San Francisco, California. Fiscal Year The Company’s fiscal year ends on January 31. References to fiscal year 2022, for example, refer to the fiscal year ended January 31, 2022. Proposed Transaction with Salesforce On December 1, 2020 the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with salesforce.com, inc. (“Salesforce”), Skyline Strategies I Inc., a Delaware corporation and a wholly owned subsidiary of Salesforce (“Merger Sub I”), and Skyline Strategies II LLC, a Delaware limited liability company and a wholly owned subsidiary of Salesforce (“Merger Sub II”). The Merger Agreement provides for the merger of Merger Sub I with and into the Company, with the Company continuing as the surviving corporation and as a wholly owned subsidiary of Salesforce (the “First Merger”), immediately followed by a second merger of the surviving corporation into either Merger Sub II or Salesforce, with either Merger Sub II or Salesforce continuing as the surviving company (the “Second Merger” and together with the First Merger, the “Mergers”). Under the terms of the Merger Agreement, all of the Company’s issued and outstanding shares of Class A common stock and Class B common stock will be converted into the right to receive (a) 0.0776 shares of Salesforce common stock and (b) $26.79 in cash, without interest. The Mergers are intended to be treated as a single integrated transaction that will qualify as a “reorganization” within the meaning of Section 368(a) of the Internal Revenue Code of 1986, as amended (the “Code”). As a result of the Mergers, the Company will cease to be a publicly traded company. The Merger Agreement contains customary representations, warranties, and covenants. The consummation of the Mergers is conditioned on the receipt of the approval of the Company’s stockholders, as well as the satisfaction of other customary closing conditions, including domestic and foreign regulatory approvals and performance in all material respects by each party of its obligations under the Merger Agreement. Consummation of the Mergers is not subject to a financing condition. In March 2021, the Company’s stockholders approved the proposal to adopt the Merger Agreement and approve the transactions contemplated thereby, including the Mergers. The Mergers are anticipated to close in the second quarter of the Company’s fiscal year 2022 (the quarter ending July 31, 2021), subject to Company receipt of required regulatory approvals, and other customary closing conditions. The Company cannot predict with certainty, however, whether and when all of the required closing conditions will be satisfied or if the Mergers will close. The Merger Agreement contains certain customary termination rights for the Company and Salesforce, including if the First Merger is not consummated by August 1, 2021, subject to two extensions of up to three months each in order to obtain required regulatory approvals. If the Merger Agreement is terminated under certain specified circumstances, including (i) a termination by the Company to enter into a superior proposal, (ii) a termination by Salesforce following a change or withdrawal of the Company’s board of directors’ recommendation of the Mergers to the Company’s stockholders, or (iii) a termination by Salesforce as a result of a material breach of the Company’s non-solicitation obligations under the Merger Agreement, then the Company will be obligated to pay to Salesforce a termination fee equal to $900.0 million in cash. The foregoing summary of the Merger Agreement and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the Merger Agreement, which is filed as Exhibit 2.1 of the Company’s Current Report on Form 8-K filed on December 1, 2020. Other than transaction expenses associated with the proposed Mergers of $3.0 million recorded in general and administrative expense in the accompanying condensed consolidated statements of operations for the quarter ended April 30, 2021, the terms of the Merger Agreement did not impact the Company’s condensed consolidated financial statements. Basis of Presentation and Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”), regarding interim financial reporting. The accompanying condensed consolidated financial statements include the accounts of the Company and its wholly owned and majority-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The condensed consolidated financial statements include 100% of the accounts of wholly owned and majority-owned subsidiaries and the ownership interest of minority investors is recorded as noncontrolling interest. The condensed consolidated balance sheet as of January 31, 2021 included herein was derived from the audited financial statements as of that date, but does not include all disclosures, including certain notes required by U.S. GAAP on an annual reporting basis. In management's opinion, the unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the balance sheets, statements of operations, statements of comprehensive loss, statements of stockholders’ equity, and statements of cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year or any future period. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K filed with the SEC on March 19, 2021. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. These estimates are based on information available as of the date of the condensed consolidated financial statements. On a regular basis, management evaluates these estimates and assumptions; however, actual results could materially differ from these estimates due to risks and uncertainties, including uncertainty in the current economic environment related to the outbreak of the novel coronavirus pandemic (“COVID-19”). The Company’s most significant estimates and judgments involve revenue recognition, stock-based compensation including the estimation of fair value of common stock, valuation of strategic investments, valuation of acquired goodwill and intangibles from acquisitions, period of benefit for deferred contract acquisition costs, fair value of the liability and equity components of the Notes, and uncertain tax positions. Concentration of Credit Risk Financial instruments that potentially subject the Company to a concentration of credit risk primarily consist of cash and cash equivalents, restricted cash, marketable securities, and accounts receivable. For cash, cash equivalents, restricted cash, and marketable securities, the Company is exposed to credit risk in the event of default by the financial institutions to the extent of the amounts recorded on the accompanying condensed consolidated balance sheets that are in excess of federal insurance limits. For accounts receivable, the Company is exposed to credit risk in the event of nonpayment by customers to the extent of the amounts recorded on the accompanying condensed consolidated balance sheets. The Company sells its services to a wide variety of customers. If the financial condition or results of operations of any significant customers deteriorates substantially, operating results could be adversely affected. To reduce credit risk, management performs credit evaluations of the financial condition of significant customers. The Company does not require collateral from its credit customers and maintains reserves for estimated credit losses on customer accounts when considered necessary. Actual credit losses may differ from the Company’s estimates. No customer accounted for 10% or greater of total accounts receivable as of April 30, 2021 and January 31, 2021. There were no customers representing 10% or greater of revenue for the three months ended April 30, 2021 and 2020. Summary of Significant Accounting Policies The Company’s significant accounting policies are discussed in “Index to Consolidated Financial Statements–Note 1. Description of Business and Summary of Significant Accounting Policies” in the Notes to Consolidated Financial Statements in its Annual Report on Form 10-K filed with the SEC on March 19, 2021. There have been no significant changes to these policies during the three months ended April 30, 2021. Recently Issued Accounting Standards Not Yet Adopted In August 2020, the FASB issued ASU No. 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity , which simplifies accounting for convertible instruments by removing major separation models required under current U.S. GAAP. ASU No. 2020-06 removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception and it also simplifies the diluted earnings per share calculation in certain areas. ASU No. 2020-06 is effective for public companies for annual periods beginning after December 15, 2021, including interim periods within those fiscal years. Early adoption is permitted for annual periods beginning after December 15, 2020, and interim periods within those fiscal years. The Company is currently evaluating the impact of this standard on its condensed consolidated financial statements and related disclosures.

Revenue and Contract Costs

Revenue and Contract Costs	3 Months Ended
	Apr. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue and Contract Costs	Revenue and Contract Costs Contract Balances Contract liabilities consist of deferred revenue. The changes in deferred revenue were as follows (in thousands): Three Months Ended April 30, 2021 Balance, beginning of period $ 510,605 Billings 278,523 Revenue (273,357) Balance, end of period $ 515,771 More than half of revenue recognized in the three months ended April 30, 2021 was from the deferred revenue balance as of January 31, 2021. Remaining Performance Obligations As of April 30, 2021, the remaining performance obligations that were unsatisfied or partially unsatisfied at the end of the reporting period were $910.8 million, of which 69% is expected to be recognized in the twelve months following April 30, 2021, with the balance to be recognized as revenue thereafter. Disaggregation of Revenue The following table shows the Company’s revenue by geographic areas, as determined based on the billing address of its customers (in thousands): Three Months Ended April 30, 2021 2020 United States $ 163,924 $ 125,387 International 109,433 76,263 Total $ 273,357 $ 201,650 No individual foreign country contributed in excess of 10% of revenue for the three months ended April 30, 2021 and 2020. Deferred Contract Acquisition Costs, Net The Company deferred incremental costs of obtaining a contract of $6.8 million and $12.6 million for the three months ended April 30, 2021 and 2020. Deferred contract acquisition costs, net included in prepaid expenses and other current assets were $20.7 million and $19.3 million as of April 30, 2021 and January 31, 2021, respectively. Deferred contract acquisition costs, net included in other assets were $31.6 million and $31.3 million as of April 30, 2021 and January 31, 2021, respectively. Amortized deferred contract acquisition costs were $5.1 million and $3.1 million for the three months ended April 30, 2021 and 2020, respectively. There was no impairment loss in relation to the deferred contract acquisition costs for any period presented in the accompanying condensed consolidated statements of operations.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Apr. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value MeasurementsThe Company’s money market funds and sweep account are classified within Level 1 of the fair value hierarchy because they are valued using quoted prices in active markets. The Company’s commercial paper, U.S. agency and government securities, international government securities, certificates of deposit, and corporate bonds are classified within Level 2 of the fair value hierarchy because they have been valued using inputs other than quoted prices in active markets that are observable directly or indirectly. The Company’s strategic investments in privately held companies are classified within Level 3 of the fair value hierarchy because they have been valued using unobservable inputs for which the Company has been required to develop its own assumptions. Realized and unrealized gains and losses relating to the strategic investments are recorded in interest income and other income, net in the accompanying condensed consolidated statements of operations. The following tables provide the financial instruments measured at fair value on a recurring basis, within the fair value hierarchy (in thousands): As of April 30, 2021 Level 1 Level 2 Level 3 Total Cash equivalents: Money market funds $ 1,205,771 $ — $ — $ 1,205,771 Total cash equivalents $ 1,205,771 $ — $ — $ 1,205,771 Marketable securities: Certificates of deposit $ — $ 2,773 $ — $ 2,773 U.S. agency securities — 132,518 — 132,518 U.S. government securities — 151,461 — 151,461 Corporate bonds — 21,712 — 21,712 Total marketable securities $ — $ 308,464 $ — $ 308,464 Noncurrent assets: Strategic investments $ — $ — $ 114,026 $ 114,026 As of January 31, 2021 Level 1 Level 2 Level 3 Total Cash equivalents: Money market funds $ 407,670 $ — $ — $ 407,670 Certificates of deposit — 75,432 — 75,432 U.S. government securities — 499,975 — 499,975 Total cash equivalents $ 407,670 $ 575,407 $ — $ 983,077 Marketable securities: Certificates of deposit $ — $ 5,535 $ — $ 5,535 U.S. agency securities — 162,809 — 162,809 U.S. government securities — 292,143 — 292,143 Corporate bonds — 45,408 — 45,408 Total marketable securities $ — $ 505,895 $ — $ 505,895 Noncurrent assets: Strategic investments $ — $ — $ 68,161 $ 68,161 The following table presents additional information about Level 3 assets measured at fair value on a recurring basis (in thousands): Three Months Ended April 30, 2021 2020 Balance at beginning of period $ 68,161 $ 28,814 Purchases 5,972 4,018 Realized net loss (500) (300) Unrealized net gains relating to investments still held at reporting date 40,393 1,938 Balance at end of period $ 114,026 $ 34,470 Convertible Senior Notes As of April 30, 2021, the fair value of the Notes was approximately $1.26 billion. The fair value was determined based on the quoted price for the Notes in an inactive market on the last trading day of the reporting period and is considered as Level 2 in the fair value hierarchy. Based on the closing price of the Company’s Class A common stock of $42.40 on the last trading

Balance Sheet Components

Balance Sheet Components	3 Months Ended
	Apr. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Components	Balance Sheet Components Cash, Cash Equivalents, and Marketable Securities The following tables summarize the amortized cost, unrealized gains and losses, and estimated fair value of cash, cash equivalents, and marketable securities consisting of the following (in thousands): As of April 30, 2021 Amortized Unrealized Unrealized Fair value Cash and cash equivalents: Cash $ 126,878 $ — $ — $ 126,878 Money market funds 1,205,771 — — 1,205,771 Total cash and cash equivalents 1,332,649 — — 1,332,649 Marketable securities: Certificates of deposit 2,750 23 — 2,773 U.S. agency securities 132,422 102 (6) 132,518 U.S. government securities 151,423 42 (4) 151,461 Corporate bonds 21,633 79 — 21,712 Total marketable securities 308,228 246 (10) 308,464 Total cash, cash equivalents and marketable securities $ 1,640,877 $ 246 $ (10) $ 1,641,113 As of January 31, 2021 Amortized Unrealized Unrealized Fair value Cash and cash equivalents: Cash $ 98,280 $ — $ — $ 98,280 Money market funds 407,670 — — 407,670 Certificates of deposit 75,432 — — 75,432 U.S. government securities 499,975 1 (1) 499,975 Total cash and cash equivalents 1,081,357 1 (1) 1,081,357 Marketable securities: Certificates of deposit 5,500 35 — 5,535 U.S. agency securities 162,673 142 (6) 162,809 U.S. government securities 292,091 57 (5) 292,143 Corporate bonds 45,184 224 — 45,408 Total marketable securities 505,448 458 (11) 505,895 Total cash, cash equivalents and marketable securities $ 1,586,805 $ 459 $ (12) $ 1,587,252 The Company periodically evaluates its investments for other-than-temporary declines in fair value. The unrealized losses on the available-for-sale securities were primarily due to unfavorable changes in interest rates subsequent to the initial purchase of these securities. Gross unrealized losses of the Company’s available-for-sale securities that have been in a continuous unrealized loss position for twelve months or longer were none as of April 30, 2021 and January 31, 2021. The Company expects to recover the full carrying value of its available-for-sale securities in an unrealized loss position as it does not intend or anticipate a need to sell these securities prior to recovering the associated unrealized losses. The Company also expects any credit losses would be immaterial based on the high-grade credit rating for each of such available-for-sale securities. As a result, the Company does not consider any portion of the unrealized losses as of April 30, 2021 or January 31, 2021 to represent an other-than temporary impairment or credit losses. The following table classifies marketable securities by contractual maturities (in thousands): As of April 30, 2021 January 31, 2021 Due in one year $ 236,494 $ 372,978 Due in one to two years 71,970 132,917 Total $ 308,464 $ 505,895 Property and Equipment, Net The following is a summary of the Company’s property and equipment by category (in thousands): As of April 30, 2021 January 31, 2021 Leasehold improvements $ 106,280 $ 106,222 Furniture and fixtures 27,769 29,956 Capitalized internal-use software costs 4,241 4,241 Computer equipment 4,189 4,189 Construction in progress 3,107 2,963 Property and equipment, gross 145,586 147,571 Less: accumulated depreciation and amortization (63,450) (59,663) Property and equipment, net $ 82,136 $ 87,908 Depreciation and amortization expense was $5.8 million and $5.5 million for the three months ended April 30, 2021 and 2020, respectively. Intangible Assets, Net Intangible assets consist of the following (in thousands): April 30, 2021 Weighted-average Gross carrying Accumulated Net carrying Customer relationships 3.8 years $ 11,200 $ 4,213 $ 6,987 Developed technology 1.8 years 13,427 9,128 4,299 Patents and licenses 5.3 years 5,875 988 4,887 Total $ 30,502 $ 14,329 $ 16,173 January 31, 2021 Weighted-average Gross carrying Accumulated Net carrying Customer relationships 4.0 years $ 11,200 $ 3,712 $ 7,488 Developed technology 2.0 years 13,427 8,162 5,265 Patents and licenses 5.6 years 5,875 743 5,132 Total $ 30,502 $ 12,617 $ 17,885 Amortization expense of intangible assets was $1.7 million and $1.2 million for the three months ended April 30, 2021 and 2020, respectively. As of April 30, 2021, expected amortization expense relating to intangible assets for each of the next five fiscal years and thereafter is as follows (in thousands): Year ending January 31, 2022 (9 months remaining) $ 4,221 2023 4,615 2024 3,254 2026 2,240 2026 1,078 Thereafter 765 Total $ 16,173

Operating Leases

Operating Leases	3 Months Ended
	Apr. 30, 2021
Leases [Abstract]
Operating Leases	Operating Leases The Company leases real estate facilities under non-cancelable operating leases with various expiration dates through fiscal year 2031. The Company recorded operating lease costs of $13.3 million and $10.9 million, including variable operating lease costs of $2.2 million and $1.4 million and short-term leases of $0.9 million and $0.8 million, for the three months ended April 30, 2021 and 2020, respectively. The following table sets forth supplemental cash flow information pertaining to the Company’s operating leases (in thousands): Three Months Ended April 30, 2021 2020 Operating cash flows used for operating leases $ 8,310 $ 8,671 The weighted-average remaining term of the Company’s operating leases was 7.9 years and 8.0 years and the weighted-average discount rate used to measure the present value of the operating lease liabilities was 5.2% and 5.2% as of April 30, 2021 and January 31, 2021, respectively. Future minimum lease payments under non-cancelable operating leases with initial lease terms in excess of one year as of April 30, 2021 as follows (in thousands): Year ending January 31, 2022 (9 months remaining) $ 25,423 2023 49,697 2024 50,865 2025 53,285 2026 54,027 Thereafter 216,123 Gross lease payments 449,420 Less: Imputed interest (67,250) Less: Tenant improvement receivables (23,425) Less: Leases executed but not yet commenced (103,236) Present value of lease liabilities $ 255,509 As of April 30, 2021, the Company had a commitment of $103.2 million for a non-cancelable operating lease of a real estate facility that has not yet commenced, and therefore is not included in the right-of-use assets or operating lease liabilities. This operating lease is expected to commence in fiscal year 2022 with a lease term of 12.0 years.

Debt and Financing Arrangements

Debt and Financing Arrangements	3 Months Ended
	Apr. 30, 2021
Debt Disclosure [Abstract]
Debt and Financing Arrangements	Debt and Financing Arrangements Convertible Senior Notes On April 9, 2020, the Company issued $862.5 million in aggregate principal amount of the Notes in a private offering pursuant to an Indenture dated April 9, 2020 (the “Indenture”), including the initial purchasers’ exercise in full of their option to purchase an additional $112.5 million principal amount of the Notes. The total net proceeds from the debt offering, after deducting initial purchaser discounts and debt issuance costs, paid or payable were $841.3 million. The Notes are senior, unsecured obligations of the Company and will accrue interest payable semiannually in arrears on April 15 and October 15 of each year, beginning on October 15, 2020, at a rate of 0.50% per year. The Notes will mature on April 15, 2025, unless earlier converted, redeemed, or repurchased. The Notes are convertible into cash, shares of the Company’s Class A common stock or a combination of cash and shares of the Company’s Class A common stock, at the Company’s election. Holders of the Notes may convert all or any portion of their Notes at their option at any time prior to the close of business on January 14, 2025 only under the following circumstances: • During any fiscal quarter commencing after the fiscal quarter ending on July 31, 2020 (and only during such fiscal quarter), if the last reported sale price of the Company’s Class A common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; • During the five business day period after any ten consecutive trading day period (the “measurement period”) in which the “trading price” (as defined in the Indenture) per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s Class A common stock and the conversion rate on each such trading day; or • Upon the occurrence of specified corporate events. On or after January 15, 2025 until the close of business on the second scheduled trading day immediately preceding the maturity date, a holder may convert all or any portion of its Notes at any time, regardless of the foregoing. The conditional conversion feature of the Notes was triggered as the last reported sale price of the Company’s Class A common stock was more than or equal to 130% of the conversion price for at least 20 trading days (whether or not consecutive) in the period of 30 consecutive trading days ended on April 30, 2021 (the last trading day of the fiscal quarter), and therefore the Notes are currently convertible, in whole or in part, at the option of the holders between May 1, 2021 through July 31, 2021. Whether the Notes will be convertible following such period will depend on the continued satisfaction of this condition or another conversion condition in the future. The Company continues to classify the Notes as a long-term liability in its condensed consolidated balance sheet as of April 30, 2021, based on contractual settlement provisions. The conversion rate was initially 32.2630 shares of the Company’s Class A common stock per $1,000 principal amount of Notes (equivalent to an initial conversion price of approximately $31.00 per share of the Company’s Class A common stock). The conversion rate is subject to adjustment in some events but will not be adjusted for any accrued and unpaid interest. In addition, following certain corporate events that occur prior to the maturity date (a “make-whole fundamental change”), the Company will, in certain circumstances, increase the conversion rate for a holder who elects to convert its Notes in connection with such a corporate event. If consummated, the Mergers are expected to constitute a make-whole fundamental change that will result in an increase to the conversion rate for a holder who elects to convert its Notes in connection therewith. Any such increase would be determined by reference to a “make-whole” table included in the indenture governing the Notes. The Company may not redeem the Notes prior to April 20, 2023. The Company may redeem for cash all or any portion of the Notes, at its option, on a redemption date occurring on or after April 20, 2023 and on or before the 21st scheduled trading day immediately before the maturity date, if the last reported sale price of the Company’s Class A common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive), including the trading day immediately preceding the date on which the Company provides notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. No sinking fund is provided for the Notes. If the Company undergoes a fundamental change (as defined in the Indenture), holders may require the Company to repurchase for cash all or any portion of their Notes at a fundamental change repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date. If consummated, the Mergers are expected to constitute a fundamental change. The Indenture contains customary terms and covenants, including that upon certain events of default occurring and continuing, either the Trustee or the holders of not less than 25% in aggregate principal amount of the Notes then outstanding may declare the entire principal amount of all the Notes plus accrued special interest, if any, to be immediately due and payable. The Notes are the Company’s general unsecured obligations and rank senior in right of payment to all of the Company’s indebtedness that is expressly subordinated in right of payment to the Notes; equal in right of payment with all of the Company’s liabilities that are not so subordinated; effectively junior to any of the Company’s secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) of the Company’s subsidiaries. In accounting for the issuance of the Notes, the Company separated the Notes into liability and equity components. The carrying amount of the liability component was calculated using a discount rate of 6.85%, which was determined by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was $229.2 million and was determined by deducting the fair value of the liability component from the par value of the Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. The excess of the principal amount of the liability component over its carrying amount, or the debt discount, is amortized to interest expense at an annual effective interest rate over the contractual terms of the Notes. The net carrying amount of the liability component of the Notes was as follows (in thousands): As of April 30, 2021 January 31, 2021 Principal $ 862,500 $ 862,500 Less: unamortized discount (187,113) (197,339) Less: unamortized issuance costs (13,163) (13,763) Net carrying amount $ 662,224 $ 651,398 The net carrying amount of the equity component of the Notes was as follows (in thousands): As of April 30, 2021 January 31, 2021 Proceeds allocated to the conversion options (debt discount) $ 229,249 $ 229,249 Less: issuance costs (5,627) (5,627) Carrying amount of the equity component $ 223,622 $ 223,622 The following table sets forth the interest expense recognized related to the Notes (in thousands): Three Months Ended April 30, 2021 2020 Contractual interest expense $ 1,078 $ 252 Amortization of debt discount 10,226 2,245 Amortization of debt issuance costs 600 121 Total interest expense related to the Notes $ 11,904 $ 2,618 Capped Call Transactions In connection with the offering of the Notes, the Company entered into privately negotiated capped call transactions with certain financial institution counterparties (the “Capped Calls”). The Capped Calls each have an initial strike price of approximately $31.00 per share, subject to certain adjustments, which corresponds to the initial conversion price of the Notes. The Capped Calls have initial cap prices of $48.62 per share, subject to certain adjustments. The Capped Calls cover, subject to anti-dilution adjustments, approximately 27.8 million shares of Class A common stock. The Capped Calls are generally intended to reduce or offset the potential dilution to the Class A common stock upon any conversion of the Notes with such reduction or offset, as the case may be, subject to a cap based on the cap price. The Capped Calls expire on the earlier of (i) the last day on which any convertible securities remain outstanding and (ii) April 15, 2025, subject to earlier exercise. The Capped Calls are subject to either adjustment or termination upon the occurrence of specified extraordinary events affecting the Company, including a merger event, a tender offer, and a nationalization, insolvency or delisting involving the Company. In addition, the Capped Calls are subject to certain specified additional disruption events that may give rise to a termination of the Capped Calls, including changes in law, insolvency filings, and hedging disruptions. The Capped Calls are recorded in stockholders’ equity and are not accounted for as derivatives. The net cost of $105.6 million incurred to purchase the capped call transactions was recorded as a reduction to additional paid-in capital in the accompanying condensed consolidated balance sheet. Revolving Credit Facility On May 30, 2019, the Company entered into a $215.0 million revolving credit and guaranty agreement with a syndicate of financial institutions. The revolving credit facility has an accordion option, which, if exercised, would allow the Company to increase the aggregate commitments by up to the greater of $200.0 million and 100% of the consolidated adjusted EBITDA of the Company and its subsidiaries, plus an unlimited amount subject to satisfaction of certain leverage ratio based compliance tests after giving effect to the exercise, in each case subject to obtaining additional lender commitments and satisfying certain conditions. Pursuant to the terms of the revolving credit facility, the Company may issue letters of credit under the revolving credit facility, which reduce the total amount available for borrowing under such facility. The revolving credit facility terminates on May 30, 2024. Interest on borrowings under the revolving credit facility accrues at a variable rate tied to the prime rate or the LIBOR, plus the applicable margin, at the Company’s election. The margin is 0.25% in the case of prime rate loans and 1.25% in the case of LIBOR loans. Interest is payable quarterly in arrears. Pursuant to the terms of the revolving credit facility, the Company is required to pay an annual commitment fee that accrues at a rate of 0.10% per annum on the unused portion of the borrowing commitments under the revolving credit facility. In addition, the Company is required to pay a fee in connection with letters of credit issued and outstanding under the revolving credit facility that accrues at a rate of 1.25% per annum on the amount to be drawn under such letters of credit outstanding. There is an additional fronting fee of 0.125% per annum multiplied by the aggregate face amount of issued and outstanding letters of credit. The revolving credit facility contains customary conditions to borrowing, events of default, and covenants, including covenants that restrict the Company’s and its subsidiaries’ ability to, among other things, incur additional indebtedness, create or incur liens, merge or consolidate with other companies, sell substantially all of the Company’s assets, liquidate or dissolve, make distributions to the Company’s equity holders or its subsidiaries’ equity interests, pay dividends, make redemptions and repurchases of stock, or engage in transactions with affiliates. In addition, the revolving credit facility contains financial covenants, including a minimum liquidity balance and a minimum revenue amount. The Company has been in compliance with all covenants under the revolving credit facility since it entered into the revolving credit and guaranty agreement on May 30, 2019. As of April 30, 2021, the Company had no amounts or letters of credit issued and outstanding under the revolving credit facility. The Company’s total available borrowing capacity under the revolving credit facility was $215.0 million as of April 30, 2021.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Apr. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Letters of Credit As of April 30, 2021, the Company had $38.5 million in standby letters of credit outstanding related to facility lease obligations in San Francisco, California and Denver, Colorado, which is included in restricted cash in the accompanying condensed consolidated balance sheets. Hosting Commitments On April 30, 2020, the Company executed an amendment to its existing agreement with Amazon Web Services (“AWS”). The amended agreement was effective as of May 1, 2020 and continues through April 30, 2025. Pursuant to the amended agreement, the Company has minimum annual commitments of $75.0 million which will increase by $5.0 million annually, for a total minimum commitment of $425.0 million. As of April 30, 2021, the Company had a remaining minimum payment obligation of $321.5 million to AWS through April 30, 2025. Legal Matters The Company records a loss contingency when it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. The Company also discloses material contingencies when it believes a loss is not probable but reasonably possible. Accounting for contingencies requires the Company to use judgment related to both the likelihood of a loss and the estimate of the amount or range of loss. The outcomes of the Company’s legal proceedings are inherently unpredictable and subject to significant uncertainties. For some matters for which a material loss is reasonably possible, an estimate of the amount of loss or range of losses is not possible, nor is the Company able to estimate the loss or range of losses that could potentially result from the application of non-monetary remedies. Many legal and tax contingencies can take years to be resolved. Until the final resolution of legal matters, all amounts of loss or range of losses are estimates only. The final losses the Company incurs may differ materially from these estimates. Beginning in September 2019, seven purported class action lawsuits were filed against the Company, its directors, certain of its officers, and certain investment funds associated with certain of its directors, each alleging violations of securities laws in connection with the Company’s registration statement on Form S-1 (the “Registration Statement”) filed with the Securities and Exchange Commission (the “SEC”). All but one of these actions were filed in the Superior Court of California for the County of San Mateo, though one plaintiff originally filed in the County of San Francisco (the “San Francisco Action”) before refiling in the County of San Mateo. The remaining action was filed in the U.S. District Court for the Northern District of California (the “Federal Action”). In the Federal Action, captioned Dennee v. Slack Technologies, Inc., Case No. 3:19-CV-05857-SI, the Company and the other defendants filed a motion to dismiss the complaint in January 2020. In April 2020, the court granted in part and denied in part the motion to dismiss. In May 2020, the Company and the other defendants filed a motion to certify the court’s order for interlocutory appeal, which the court granted. The Company and the other defendants filed a petition for permission to appeal the district court’s order to the Ninth Circuit Court of Appeals, which was granted in July 2020. Oral argument was heard in May 2021, and a decision is pending. The state court actions were consolidated in November 2019, and the consolidated action is captioned In re Slack Technologies, Inc. Shareholder Litigation, Lead Case No. 19CIV05370 (the “State Court Action”). An additional state court action was filed in San Mateo County in June 2020 but was consolidated with the State Court Action in July 2020. The Company and the other defendants filed demurrers to the complaint in the State Court Action in February 2020. In August 2020, the court sustained in part and overruled in part the demurrers, and granted plaintiffs leave to file an amended complaint, which they did in October 2020. The Company and the other defendants answered the complaint in November 2020. The plaintiff in the San Francisco Action has sought dismissal of that action after joining the State Court Action. That dismissal remains pending. The Federal Action and the State Court Action seek unspecified monetary damages and other relief on behalf of investors who purchased the Company’s Class A common stock issued pursuant and/or traceable to the Registration Statement. In April 2020, three purported stockholder derivative lawsuits were filed against certain of the Company’s officers and certain of the Company’s current and former directors in the U.S. District Courts for the District of Delaware and the Northern District of California. The case filed in the Northern District of California was dismissed and re-filed in the U.S. District Court for the District of Delaware. The derivative cases were consolidated in June 2020, and the operative complaint was designated in August 2020. The complaint alleges breaches of fiduciary duty in connection with the Company’s Registration Statement, and seeks the award of unspecified damages to the Company, and certain reforms to the Company’s governance policies. The Company moved to dismiss the case in September 2020. At approximately the same time, the plaintiff in the lawsuit brought pursuant to Delaware General Corporation Law Section 220 (discussed below) sought to intervene and stay the case. On that basis, the plaintiffs in the purported derivative lawsuit elected not to file an opposition to the motion to dismiss. In December 2020, the parties stipulated to stay the case in light of the proposed Mergers, which the court granted. The court also denied all pending motions in the case without prejudice, noting that the parties may renew the motions upon a lift of the stay. In June 2020, a lawsuit was filed by a stockholder against the Company in the Delaware Court of Chancery pursuant to Delaware General Corporation Law Section 220 seeking an order permitting inspection and copying of certain of the Company’s books and records. The Company answered the complaint in October 2020. The Company believes the above-described lawsuits are without merit and intends to vigorously defend them. Based on the preliminary nature of the proceedings in these cases, the outcomes of these matters remain uncertain. In addition, the Company is involved from time to time in various claims and legal actions arising in the ordinary course of business. While it is not feasible to predict or determine the ultimate outcomes of these matters, the Company believes that none of these ordinary course legal proceedings will have a material adverse effect on its condensed consolidated financial statements. Indemnification Agreements In the ordinary course of business, the Company provides indemnifications of varying scope and terms to customers, business partners, vendors, lessors, investors, directors, officers, employees, and other parties with respect to certain matters. Indemnification may include losses from the Company’s breach of such agreements, intellectual property infringement claims made by third parties, and other liabilities relating to or arising from Slack, or the Company’s acts or omissions. These indemnifications may survive termination of the underlying agreement and the maximum potential amount of future

Stockholders Equity

Stockholders Equity	3 Months Ended
	Apr. 30, 2021
Equity [Abstract]
Stockholders Equity	Stockholders' Equity Common Stock The Company’s amended and restated certificate of incorporation authorizes the issuance of Class A common stock and Class B common stock. As of April 30, 2021, the Company had authorized 5.0 billion shares of Class A common stock and 700.0 million shares of Class B common stock, each at par value of $0.0001. As of April 30, 2021, 510.7 million shares of Class A common stock and 75.0 million shares of Class B common stock were issued and outstanding. Preferred Stock The Company’s board of directors has the authority, without further action by the Company’s stockholders, to issue up to 100,000,000 shares of undesignated preferred stock with rights and preferences, including voting rights, designated from time to time by the board of directors. Equity Incentive Plans The Company maintains two equity incentive plans: the 2009 Stock Plan (the “2009 Plan”) and the 2019 Stock Option and Incentive Plan (the “2019 Plan”). All shares to be granted in the future will be made under the 2019 Plan. In addition, the Company maintains the 2019 Employee Stock Purchase Plan (the “2019 ESPP”) to eligible employees. Pursuant to the terms of the Merger Agreement, the Company is not providing any new offering periods to employees under the 2019 ESPP subsequent to April 9, 2021. Stock Options A summary of stock option activity under the 2009 Plan and 2019 Plan is as follows (in thousands, except years and per share data): Number of shares Weighted-average exercise price per share Weighted-average remaining contractual term (In years) Aggregate intrinsic value Outstanding at January 31, 2021 6,228 $ 10.31 6.89 $ 198,434 Granted — — Exercised (257) 5.19 Cancelled (232) 10.56 Outstanding at April 30, 2021 5,739 $ 10.53 6.53 $ 182,915 Stock options vested and exercisable at April 30, 2021 2,686 $ 4.08 4.62 $ 102,923 Stock options vested and expected to vest at April 30, 2021 5,739 $ 10.53 6.53 $ 182,915 As of April 30, 2021, there was $22.9 million of total unrecognized stock-based compensation related to outstanding stock options, which will be recognized over a weighted average period of 3.4 years. Restricted Stock Units and Restricted Stock Awards A summary of Restricted Stock Units (“RSUs”) and Restricted Stock Awards (“RSAs”) activity under the 2009 Plan and 2019 Plan is as follows (in thousands, except per share data): Restricted stock units Restricted stock awards Number of shares Weighted-average grant date fair value Number of shares Weighted-average grant date fair value Unvested at January 31, 2021 34,700 $ 19.13 1,099 $ 8.89 Granted 6,845 40.97 — — Released (4,155) 14.79 (117) 9.04 Cancelled (1,857) 21.05 (23) 6.22 Unvested at April 30, 2021 35,533 $ 23.74 959 $ 8.94 As of April 30, 2021, there was $660.8 million of total unrecognized stock-based compensation related to unvested RSUs, which will be recognized over a weighted average period of 2.2 years. As of April 30, 2021, there was $8.1 million of total unrecognized stock-based compensation related to unvested RSAs, which will be recognized over a weighted average period of 2.8 years. 2019 Employee Stock Purchase Plan For the three months ended April 30, 2021, 0.8 million shares of Class A common stock were issued under the 2019 ESPP. Pursuant to the terms of the Merger Agreement, the Company is not providing any new offering periods under the 2019 ESPP subsequent to April 9, 2021. As such, there was no unrecognized compensation cost related to the 2019 ESPP as of April 30, 2021. The Company recorded the total stock-based compensation expense as follows (in thousands): Three Months Ended April 30, 2021 2020 Cost of revenue $ 2,551 $ 2,354 Research and development 28,809 27,419 Sales and marketing 13,939 14,075 General and administrative 13,718 9,863 Total $ 59,017 $ 53,711 Noncontrolling Interest In March 2021, the Company entered into a transfer agreement by and among Slack (as manager and a member of Slack Fund), Slack Fund, and each of the members of Slack Fund (the “Transfer Agreement”). Pursuant to the Transfer Agreement, the Company purchased all the outstanding LLC interests from the other members for $22.6 million. The increase in the Company’s ownership in Slack Fund was recorded as a reduction in noncontrolling interest in the accompanying condensed consolidated balance sheet.

Interest Income and Other Incom

Interest Income and Other Income, Net	3 Months Ended
	Apr. 30, 2021
Other Income and Expenses [Abstract]
Interest Income and Other Income, Net	Interest Income and Other Income, Net Interest income and other income, net consist of the following (in thousands): Three Months Ended April 30, 2021 2020 Interest income $ 465 $ 3,187 Unrealized gains (losses) on foreign exchange (129) 44 Transaction losses on foreign exchange (3) (161) Change in fair value of strategic investments 39,893 1,638 Other non-operating income, net 200 — Interest income and other income, net $ 40,426 $ 4,708

Income Taxes

Income Taxes	3 Months Ended
	Apr. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company computes its provision for income taxes by applying the estimated annual effective tax rate to pretax income or loss and adjusts the provision for discrete tax items recorded in the period. For the three months ended April 30, 2021 and 2020, the Company recorded a tax provision of $1.1 million and $0.1 million on pretax losses of $26.9 million and $74.3 million, respectively. The effective tax rates for the three months ended April 30, 2021 and 2020 were (4.0)% and (0.2)%, respectively. For the three months ended April 30, 2021, the Company maintained a full valuation allowance on its U.S. federal, state, and certain foreign jurisdictions net deferred tax assets as it was more likely than not that those deferred tax assets would not be realized. In March 2020, the President of the United States signed into law the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”). The CARES Act, among other things, includes certain income tax provisions for individuals and corporations; however, since the Company has recorded a full valuation allowance against its deferred tax assets, these changes to U.S. tax law do not have a material impact on the Company’s provision for income taxes in its condensed consolidated financial statements. In addition, although many countries in which the Company operates have also issued some form of COVID-19 related income tax guidance, this guidance does not have material impact on provision for income taxes in its condensed consolidated financial statements as of April 30, 2021.

Net Loss per Share Attributable

Net Loss per Share Attributable to Slack Common Stockholders	3 Months Ended
	Apr. 30, 2021
Earnings Per Share [Abstract]
Net Loss per Share Attributable to Slack Common Stockholders	Net Loss per Share Attributable to Slack Common Stockholders Basic net loss per share attributable to Slack common stockholders is computed by dividing the net loss attributable to Slack common stockholders by the weighted average number of shares of common stock outstanding during the period. Diluted loss per share is the same as basic loss per share for all years presented because the effects of potentially dilutive items were antidilutive given the Company’s net loss in each period presented. The following table presents the calculation of basic and diluted net loss per share attributable to Slack common stockholders (in thousands, except per share data): Three Months Ended April 30, 2021 2020 Numerator: Net loss attributable to Slack $ (27,945) $ (75,211) Denominator: Weighted average common shares outstanding 581,550 557,414 Net loss per share attributable to Slack common stockholders, basic and diluted $ (0.05) $ (0.13) Since the Company was in a loss position for all periods presented, basic net loss per share attributable to Slack common stockholders is the same as diluted net loss per share attributable to Slack common stockholders as the inclusion of all potential common shares outstanding would have been antidilutive. Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands): As of April 30, 2021 April 30, 2020 Shares related to convertible senior notes 27,827 — Stock options 5,739 8,890 Unvested early exercised stock options 6 40 Restricted stock units 35,533 43,926 Restricted stock awards 959 1,456 Restricted stock 602 — Employee stock purchase plan — 594 Total antidilutive securities 70,666 54,906 The Company had 373.4 million shares of preferred stock outstanding that were converted to shares of Class B common stock in connection with the direct listing of the Company’s Class A common stock on the New York Stock Exchange. These securities were potentially dilutive, as outstanding shares of preferred stock, through the date of conversion of June 7, 2019. The Notes will not have an impact on the Company’s diluted earnings per share until the average market price of the Company’s Class A common stock exceeds the initial conversion price of approximately $31.00 per share, as the Company intends and has the ability to settle the principal amount of the Notes in cash upon conversion. The Company is required under the treasury stock method to compute the potentially dilutive shares of Class A common stock related to the Notes for periods the Company reports net income. However, upon conversion, there will be no economic dilution from the Notes until the average market price of the Company’s Class A common stock exceeds the cap price of $48.62 per share, as exercise of the Capped Calls offsets any dilution from the Notes from the conversion price up to the cap price. Capped Calls are excluded from the calculation of diluted earnings per share, as they would be antidilutive under the treasury stock method.

Description of Business and S_2

Description of Business and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Apr. 30, 2021
Accounting Policies [Abstract]
Fiscal Year	Fiscal Year The Company’s fiscal year ends on January 31. References to fiscal year 2022, for example, refer to the fiscal year ended January 31, 2022.
Basis of Presentation	Basis of Presentation and Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”), regarding interim financial reporting. The accompanying condensed consolidated financial statements include the accounts of the Company and its wholly owned and majority-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The condensed consolidated financial statements include 100% of the accounts of wholly owned and majority-owned subsidiaries and the ownership interest of minority investors is recorded as noncontrolling interest. The condensed consolidated balance sheet as of January 31, 2021 included herein was derived from the audited financial statements as of that date, but does not include all disclosures, including certain notes required by U.S. GAAP on an annual reporting basis. In management's opinion, the unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the balance sheets, statements of operations, statements of comprehensive loss, statements of stockholders’ equity, and statements of cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year or any future period. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K filed with the SEC on March 19, 2021.
Consolidation	Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”), regarding interim financial reporting. The accompanying condensed consolidated financial statements include the accounts of the Company and its wholly owned and majority-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The condensed consolidated financial statements include 100% of the accounts of wholly owned and majority-owned subsidiaries and the ownership interest of minority investors is recorded as noncontrolling interest. The condensed consolidated balance sheet as of January 31, 2021 included herein was derived from the audited financial statements as of that date, but does not include all disclosures, including certain notes required by U.S. GAAP on an annual reporting basis. In management's opinion, the unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the balance sheets, statements of operations, statements of comprehensive loss, statements of stockholders’ equity, and statements of cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year or any future period. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K filed with the SEC on March 19, 2021.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. These estimates are based on information available as of the date of the condensed consolidated financial statements. On a regular basis, management evaluates these estimates and assumptions; however, actual results could materially differ from these estimates due to risks and uncertainties, including uncertainty in the current economic environment related to the outbreak of the novel coronavirus pandemic (“COVID-19”). The Company’s most significant estimates and judgments involve revenue recognition, stock-based compensation including the estimation of fair value of common stock, valuation of strategic investments, valuation of acquired goodwill and intangibles from acquisitions, period of benefit for deferred contract acquisition costs, fair value of the liability and equity components of the Notes, and uncertain tax positions.
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that potentially subject the Company to a concentration of credit risk primarily consist of cash and cash equivalents, restricted cash, marketable securities, and accounts receivable. For cash, cash equivalents, restricted cash, and marketable securities, the Company is exposed to credit risk in the event of default by the financial institutions to the extent of the amounts recorded on the accompanying condensed consolidated balance sheets that are in excess of federal insurance limits. For accounts receivable, the Company is exposed to credit risk in the event of nonpayment by customers to the extent of the amounts recorded on the accompanying condensed consolidated balance sheets. The Company sells its services to a wide variety of customers. If the financial condition or results of operations of any significant customers deteriorates substantially, operating results could be adversely affected. To reduce credit risk, management performs credit evaluations of the financial condition of significant customers. The Company does not require collateral from its credit customers and maintains reserves for estimated credit losses on customer accounts when considered necessary. Actual credit losses may differ from the Company’s estimates.
Summary of Significant Accounting Policies and Recently Issued Accounting Standards Not Yet Adopted	Summary of Significant Accounting Policies The Company’s significant accounting policies are discussed in “Index to Consolidated Financial Statements–Note 1. Description of Business and Summary of Significant Accounting Policies” in the Notes to Consolidated Financial Statements in its Annual Report on Form 10-K filed with the SEC on March 19, 2021. There have been no significant changes to these policies during the three months ended April 30, 2021. Recently Issued Accounting Standards Not Yet Adopted In August 2020, the FASB issued ASU No. 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity , which simplifies accounting for convertible instruments by removing major separation models required under current U.S. GAAP. ASU No. 2020-06 removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception and it also simplifies the diluted earnings per share calculation in certain areas. ASU No. 2020-06 is effective for public companies for annual periods beginning after December 15, 2021, including interim periods within those fiscal years. Early adoption is permitted for annual periods beginning after December 15, 2020, and interim periods within those fiscal years. The Company is currently evaluating the impact of this standard on its condensed consolidated financial statements and related disclosures.
Net Loss per Share Attributable to Slack Common Stockholders	Net Loss per Share Attributable to Slack Common StockholdersBasic net loss per share attributable to Slack common stockholders is computed by dividing the net loss attributable to Slack common stockholders by the weighted average number of shares of common stock outstanding during the period. Diluted loss per share is the same as basic loss per share for all years presented because the effects of potentially dilutive items were antidilutive given the Company’s net loss in each period presented.

Revenue and Contract Costs (Tab

Revenue and Contract Costs (Tables)	3 Months Ended
	Apr. 30, 2021
Revenue from Contract with Customer [Abstract]
Schedule of Contract Liabilities	Contract liabilities consist of deferred revenue. The changes in deferred revenue were as follows (in thousands): Three Months Ended April 30, 2021 Balance, beginning of period $ 510,605 Billings 278,523 Revenue (273,357) Balance, end of period $ 515,771
Schedule of Revenues by Geographical Area	The following table shows the Company’s revenue by geographic areas, as determined based on the billing address of its customers (in thousands): Three Months Ended April 30, 2021 2020 United States $ 163,924 $ 125,387 International 109,433 76,263 Total $ 273,357 $ 201,650

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Apr. 30, 2021
Fair Value Disclosures [Abstract]
Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis	The following tables provide the financial instruments measured at fair value on a recurring basis, within the fair value hierarchy (in thousands): As of April 30, 2021 Level 1 Level 2 Level 3 Total Cash equivalents: Money market funds $ 1,205,771 $ — $ — $ 1,205,771 Total cash equivalents $ 1,205,771 $ — $ — $ 1,205,771 Marketable securities: Certificates of deposit $ — $ 2,773 $ — $ 2,773 U.S. agency securities — 132,518 — 132,518 U.S. government securities — 151,461 — 151,461 Corporate bonds — 21,712 — 21,712 Total marketable securities $ — $ 308,464 $ — $ 308,464 Noncurrent assets: Strategic investments $ — $ — $ 114,026 $ 114,026 As of January 31, 2021 Level 1 Level 2 Level 3 Total Cash equivalents: Money market funds $ 407,670 $ — $ — $ 407,670 Certificates of deposit — 75,432 — 75,432 U.S. government securities — 499,975 — 499,975 Total cash equivalents $ 407,670 $ 575,407 $ — $ 983,077 Marketable securities: Certificates of deposit $ — $ 5,535 $ — $ 5,535 U.S. agency securities — 162,809 — 162,809 U.S. government securities — 292,143 — 292,143 Corporate bonds — 45,408 — 45,408 Total marketable securities $ — $ 505,895 $ — $ 505,895 Noncurrent assets: Strategic investments $ — $ — $ 68,161 $ 68,161
Schedule of Level 3 Assets Measured at Fair Value on Recurring Basis	The following table presents additional information about Level 3 assets measured at fair value on a recurring basis (in thousands): Three Months Ended April 30, 2021 2020 Balance at beginning of period $ 68,161 $ 28,814 Purchases 5,972 4,018 Realized net loss (500) (300) Unrealized net gains relating to investments still held at reporting date 40,393 1,938 Balance at end of period $ 114,026 $ 34,470

Balance Sheet Components (Table

Balance Sheet Components (Tables)	3 Months Ended
	Apr. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Cash and Cash Equivalents and Marketable Securities	The following tables summarize the amortized cost, unrealized gains and losses, and estimated fair value of cash, cash equivalents, and marketable securities consisting of the following (in thousands): As of April 30, 2021 Amortized Unrealized Unrealized Fair value Cash and cash equivalents: Cash $ 126,878 $ — $ — $ 126,878 Money market funds 1,205,771 — — 1,205,771 Total cash and cash equivalents 1,332,649 — — 1,332,649 Marketable securities: Certificates of deposit 2,750 23 — 2,773 U.S. agency securities 132,422 102 (6) 132,518 U.S. government securities 151,423 42 (4) 151,461 Corporate bonds 21,633 79 — 21,712 Total marketable securities 308,228 246 (10) 308,464 Total cash, cash equivalents and marketable securities $ 1,640,877 $ 246 $ (10) $ 1,641,113 As of January 31, 2021 Amortized Unrealized Unrealized Fair value Cash and cash equivalents: Cash $ 98,280 $ — $ — $ 98,280 Money market funds 407,670 — — 407,670 Certificates of deposit 75,432 — — 75,432 U.S. government securities 499,975 1 (1) 499,975 Total cash and cash equivalents 1,081,357 1 (1) 1,081,357 Marketable securities: Certificates of deposit 5,500 35 — 5,535 U.S. agency securities 162,673 142 (6) 162,809 U.S. government securities 292,091 57 (5) 292,143 Corporate bonds 45,184 224 — 45,408 Total marketable securities 505,448 458 (11) 505,895 Total cash, cash equivalents and marketable securities $ 1,586,805 $ 459 $ (12) $ 1,587,252
Schedule of Marketable Securities by Contractual Maturity	The following table classifies marketable securities by contractual maturities (in thousands): As of April 30, 2021 January 31, 2021 Due in one year $ 236,494 $ 372,978 Due in one to two years 71,970 132,917 Total $ 308,464 $ 505,895
Schedule of Property and Equipment by Category	The following is a summary of the Company’s property and equipment by category (in thousands): As of April 30, 2021 January 31, 2021 Leasehold improvements $ 106,280 $ 106,222 Furniture and fixtures 27,769 29,956 Capitalized internal-use software costs 4,241 4,241 Computer equipment 4,189 4,189 Construction in progress 3,107 2,963 Property and equipment, gross 145,586 147,571 Less: accumulated depreciation and amortization (63,450) (59,663) Property and equipment, net $ 82,136 $ 87,908
Schedule of Intangible Assets	Intangible assets consist of the following (in thousands): April 30, 2021 Weighted-average Gross carrying Accumulated Net carrying Customer relationships 3.8 years $ 11,200 $ 4,213 $ 6,987 Developed technology 1.8 years 13,427 9,128 4,299 Patents and licenses 5.3 years 5,875 988 4,887 Total $ 30,502 $ 14,329 $ 16,173 January 31, 2021 Weighted-average Gross carrying Accumulated Net carrying Customer relationships 4.0 years $ 11,200 $ 3,712 $ 7,488 Developed technology 2.0 years 13,427 8,162 5,265 Patents and licenses 5.6 years 5,875 743 5,132 Total $ 30,502 $ 12,617 $ 17,885
Schedule of Expected Amortization Expense Related to Intangible Assets	As of April 30, 2021, expected amortization expense relating to intangible assets for each of the next five fiscal years and thereafter is as follows (in thousands): Year ending January 31, 2022 (9 months remaining) $ 4,221 2023 4,615 2024 3,254 2026 2,240 2026 1,078 Thereafter 765 Total $ 16,173

Operating Leases (Tables)

Operating Leases (Tables)	3 Months Ended
	Apr. 30, 2021
Leases [Abstract]
Schedule of Operating Leases, Other Information	The following table sets forth supplemental cash flow information pertaining to the Company’s operating leases (in thousands): Three Months Ended April 30, 2021 2020 Operating cash flows used for operating leases $ 8,310 $ 8,671
Schedule of Maturities of Operating Lease Liabilities	Future minimum lease payments under non-cancelable operating leases with initial lease terms in excess of one year as of April 30, 2021 as follows (in thousands): Year ending January 31, 2022 (9 months remaining) $ 25,423 2023 49,697 2024 50,865 2025 53,285 2026 54,027 Thereafter 216,123 Gross lease payments 449,420 Less: Imputed interest (67,250) Less: Tenant improvement receivables (23,425) Less: Leases executed but not yet commenced (103,236) Present value of lease liabilities $ 255,509

Debt and Financing Arrangemen_2

Debt and Financing Arrangements (Tables)	3 Months Ended
	Apr. 30, 2021
Debt Disclosure [Abstract]
Schedule of Convertible Debt	The net carrying amount of the liability component of the Notes was as follows (in thousands): As of April 30, 2021 January 31, 2021 Principal $ 862,500 $ 862,500 Less: unamortized discount (187,113) (197,339) Less: unamortized issuance costs (13,163) (13,763) Net carrying amount $ 662,224 $ 651,398 The net carrying amount of the equity component of the Notes was as follows (in thousands): As of April 30, 2021 January 31, 2021 Proceeds allocated to the conversion options (debt discount) $ 229,249 $ 229,249 Less: issuance costs (5,627) (5,627) Carrying amount of the equity component $ 223,622 $ 223,622 The following table sets forth the interest expense recognized related to the Notes (in thousands): Three Months Ended April 30, 2021 2020 Contractual interest expense $ 1,078 $ 252 Amortization of debt discount 10,226 2,245 Amortization of debt issuance costs 600 121 Total interest expense related to the Notes $ 11,904 $ 2,618

Stockholders Equity (Tables)

Stockholders Equity (Tables)	3 Months Ended
	Apr. 30, 2021
Equity [Abstract]
Schedule of Stock Options Activity	A summary of stock option activity under the 2009 Plan and 2019 Plan is as follows (in thousands, except years and per share data): Number of shares Weighted-average exercise price per share Weighted-average remaining contractual term (In years) Aggregate intrinsic value Outstanding at January 31, 2021 6,228 $ 10.31 6.89 $ 198,434 Granted — — Exercised (257) 5.19 Cancelled (232) 10.56 Outstanding at April 30, 2021 5,739 $ 10.53 6.53 $ 182,915 Stock options vested and exercisable at April 30, 2021 2,686 $ 4.08 4.62 $ 102,923 Stock options vested and expected to vest at April 30, 2021 5,739 $ 10.53 6.53 $ 182,915
Schedule of Restricted Stock Units and Restricted Stock Activity	A summary of Restricted Stock Units (“RSUs”) and Restricted Stock Awards (“RSAs”) activity under the 2009 Plan and 2019 Plan is as follows (in thousands, except per share data): Restricted stock units Restricted stock awards Number of shares Weighted-average grant date fair value Number of shares Weighted-average grant date fair value Unvested at January 31, 2021 34,700 $ 19.13 1,099 $ 8.89 Granted 6,845 40.97 — — Released (4,155) 14.79 (117) 9.04 Cancelled (1,857) 21.05 (23) 6.22 Unvested at April 30, 2021 35,533 $ 23.74 959 $ 8.94
Schedule of Stock-Based Compensation Expense	The Company recorded the total stock-based compensation expense as follows (in thousands): Three Months Ended April 30, 2021 2020 Cost of revenue $ 2,551 $ 2,354 Research and development 28,809 27,419 Sales and marketing 13,939 14,075 General and administrative 13,718 9,863 Total $ 59,017 $ 53,711

Interest Income and Other Inc_2

Interest Income and Other Income, Net (Tables)	3 Months Ended
	Apr. 30, 2021
Other Income and Expenses [Abstract]
Schedule of Interest Income and Other Income, Net	Interest income and other income, net consist of the following (in thousands): Three Months Ended April 30, 2021 2020 Interest income $ 465 $ 3,187 Unrealized gains (losses) on foreign exchange (129) 44 Transaction losses on foreign exchange (3) (161) Change in fair value of strategic investments 39,893 1,638 Other non-operating income, net 200 — Interest income and other income, net $ 40,426 $ 4,708

Net Loss per Share Attributab_2

Net Loss per Share Attributable to Slack Common Stockholders (Tables)	3 Months Ended
	Apr. 30, 2021
Earnings Per Share [Abstract]
Schedule Calculation of Basic and Diluted Net Loss Per Share	The following table presents the calculation of basic and diluted net loss per share attributable to Slack common stockholders (in thousands, except per share data): Three Months Ended April 30, 2021 2020 Numerator: Net loss attributable to Slack $ (27,945) $ (75,211) Denominator: Weighted average common shares outstanding 581,550 557,414 Net loss per share attributable to Slack common stockholders, basic and diluted $ (0.05) $ (0.13)
Schedule of Potentially Dilutive Securities Excluded from Diluted Per Share Calculations	Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands): As of April 30, 2021 April 30, 2020 Shares related to convertible senior notes 27,827 — Stock options 5,739 8,890 Unvested early exercised stock options 6 40 Restricted stock units 35,533 43,926 Restricted stock awards 959 1,456 Restricted stock 602 — Employee stock purchase plan — 594 Total antidilutive securities 70,666 54,906

Description of Business and S_3

Description of Business and Summary of Significant Accounting Policies (Details) - Slack Technologies, Inc. $ / shares in Units, $ in Millions	Dec. 01, 2020USD ($)extension$ / sharesshares	Apr. 30, 2021USD ($)
Subsidiary, Sale of Stock [Line Items]
Transaction expenses related to merger		$ 3
Salesforce.com
Subsidiary, Sale of Stock [Line Items]
Number of shares received upon conversion of issued and outstanding common stock (in shares) | shares	0.0776
Value of cash received upon conversion (in dollars per share) | $ / shares	$ 26.79
Number of potential extensions | extension	2
Term of potential extensions	3 months
Potential fees owed upon termination of merger agreement	$ 900

Revenue and Contract Costs - Sc

Revenue and Contract Costs - Schedule of Contract Liabilities (Details) $ in Thousands	3 Months Ended
	Apr. 30, 2021USD ($)
Contract With Customer, Liability [Roll Forward]
Balance, beginning of period	$ 510,605
Billings	278,523
Revenue	(273,357)
Balance, end of period	$ 515,771

Revenue and Contract Costs - Re

Revenue and Contract Costs - Remaining Performance Obligations (Details) $ in Millions	Apr. 30, 2021USD ($)
Revenue from Contract with Customer [Abstract]
Future estimated revenue related to unsatisfied or partially satisfied performance obligations	$ 910.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-05-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations expected to be recognized (as a percent)	69.00%
Performance obligations expected to be satisfied, expected timing	12 months

Revenue and Contract Costs - _2

Revenue and Contract Costs - Schedule of Revenue by Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 273,357	$ 201,650
United States
Disaggregation of Revenue [Line Items]
Total revenues	163,924	125,387
International
Disaggregation of Revenue [Line Items]
Total revenues	$ 109,433	$ 76,263

Revenue and Contract Costs - Na

Revenue and Contract Costs - Narrative (Details) - USD ($)	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Jan. 31, 2021
Revenue from Contract with Customer [Abstract]
Deferred incremental costs of obtaining a contract	$ 6,800,000	$ 12,600,000
Deferred commissions, net included in prepaid expenses and other current assets	20,700,000		$ 19,300,000
Deferred commissions, net included in other assets	31,600,000		$ 31,300,000
Amortization of deferred contract acquisition costs	5,060,000	3,143,000
Impairment loss related to deferred costs	$ 0	$ 0

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 308,464	$ 505,895
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,205,771	407,670
Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		75,432
U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		499,975
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,205,771	983,077
Marketable securities	308,464	505,895
Strategic investments	114,026	68,161
Fair Value, Recurring | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	2,773	5,535
Fair Value, Recurring | U.S. agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	132,518	162,809
Fair Value, Recurring | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	151,461	292,143
Fair Value, Recurring | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	21,712	45,408
Fair Value, Recurring | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,205,771	407,670
Fair Value, Recurring | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		75,432
Fair Value, Recurring | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		499,975
Fair Value, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,205,771	407,670
Marketable securities	0	0
Strategic investments	0	0
Fair Value, Recurring | Level 1 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring | Level 1 | U.S. agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring | Level 1 | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring | Level 1 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring | Level 1 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,205,771	407,670
Fair Value, Recurring | Level 1 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Fair Value, Recurring | Level 1 | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Fair Value, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	575,407
Marketable securities	308,464	505,895
Strategic investments	0	0
Fair Value, Recurring | Level 2 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	2,773	5,535
Fair Value, Recurring | Level 2 | U.S. agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	132,518	162,809
Fair Value, Recurring | Level 2 | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	151,461	292,143
Fair Value, Recurring | Level 2 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	21,712	45,408
Fair Value, Recurring | Level 2 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Fair Value, Recurring | Level 2 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		75,432
Fair Value, Recurring | Level 2 | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		499,975
Fair Value, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Marketable securities	0	0
Strategic investments	114,026	68,161
Fair Value, Recurring | Level 3 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring | Level 3 | U.S. agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring | Level 3 | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring | Level 3 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring | Level 3 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 0	0
Fair Value, Recurring | Level 3 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Fair Value, Recurring | Level 3 | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		$ 0

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Level 3 Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 68,161	$ 28,814
Purchases	5,972	4,018
Realized net loss	(500)	(300)
Unrealized net gains relating to investments still held at reporting date	40,393	1,938
Balance at end of period	$ 114,026	$ 34,470

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) $ / shares in Units, $ in Millions	Apr. 30, 2021USD ($)$ / shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Closing price of common stock on last trading day of quarter (in dollars per share) | $ / shares	$ 42.40
Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt, if-convertible value in excess of principal amount	$ 317
Level 2 | Shares related to convertible senior notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of convertible senior notes	$ 1,260

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Cash and Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents, amortized cost	$ 1,332,649	$ 1,081,357
Marketable securities, amortized cost	308,228	505,448
Marketable securities, unrealized gains	246	458
Marketable securities, unrealized losses	(10)	(11)
Marketable securities, fair value	308,464	505,895
Total cash, cash equivalents and marketable securities, amortized cost	1,640,877	1,586,805
Total cash, cash equivalents and marketable securities, unrealized gains	246	459
Total cash, cash equivalents and marketable securities, unrealized losses	(10)	(12)
Total cash, cash equivalents and marketable securities, fair value	1,641,113	1,587,252
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Marketable securities, amortized cost	2,750	5,500
Marketable securities, unrealized gains	23	35
Marketable securities, unrealized losses	0	0
Marketable securities, fair value	2,773	5,535
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, amortized cost	132,422	162,673
Marketable securities, unrealized gains	102	142
Marketable securities, unrealized losses	(6)	(6)
Marketable securities, fair value	132,518	162,809
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, amortized cost	151,423	292,091
Marketable securities, unrealized gains	42	57
Marketable securities, unrealized losses	(4)	(5)
Marketable securities, fair value	151,461	292,143
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Marketable securities, amortized cost	21,633	45,184
Marketable securities, unrealized gains	79	224
Marketable securities, unrealized losses	0	0
Marketable securities, fair value	21,712	45,408
Total cash and cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents, amortized cost	1,332,649	1,081,357
Cash and cash equivalents, unrealized gains	0	1
Cash and cash equivalents, unrealized losses	0	(1)
Cash and cash equivalents, fair value	1,332,649	1,081,357
Cash
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents, amortized cost	126,878	98,280
Cash and cash equivalents, unrealized gains	0	0
Cash and cash equivalents, unrealized losses	0	0
Cash and cash equivalents, fair value	126,878	98,280
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents, amortized cost	1,205,771	407,670
Cash and cash equivalents, unrealized gains	0	0
Cash and cash equivalents, unrealized losses	0	0
Cash and cash equivalents, fair value	$ 1,205,771	407,670
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents, amortized cost		75,432
Cash and cash equivalents, unrealized gains		0
Cash and cash equivalents, unrealized losses		0
Cash and cash equivalents, fair value		75,432
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents, amortized cost		499,975
Cash and cash equivalents, unrealized gains		1
Cash and cash equivalents, unrealized losses		(1)
Cash and cash equivalents, fair value		$ 499,975

Balance Sheet Components - Sc_2

Balance Sheet Components - Schedule of Marketable Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Due in one year	$ 236,494	$ 372,978
Due in one to two years	71,970	132,917
Total	$ 308,464	$ 505,895

Balance Sheet Components - Sc_3

Balance Sheet Components - Schedule of Property and Equipment by Category (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 145,586	$ 147,571
Less: accumulated depreciation and amortization	(63,450)	(59,663)
Property and equipment, net	82,136	87,908
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	106,280	106,222
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	27,769	29,956
Capitalized internal-use software costs
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,241	4,241
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,189	4,189
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,107	$ 2,963

Balance Sheet Components - Narr

Balance Sheet Components - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Depreciation and amortization expense	$ 5.8	$ 5.5
Amortization expense of intangible assets	$ 1.7	$ 1.2

Balance Sheet Components - Sc_4

Balance Sheet Components - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2021	Jan. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 30,502	$ 30,502
Accumulated amortization	14,329	12,617
Net carrying amount	16,173	17,885
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	11,200	11,200
Accumulated amortization	4,213	3,712
Net carrying amount	6,987	7,488
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	13,427	13,427
Accumulated amortization	9,128	8,162
Net carrying amount	4,299	5,265
Patents and licenses
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	5,875	5,875
Accumulated amortization	988	743
Net carrying amount	$ 4,887	$ 5,132
Weighted Average | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-average remaining amortization period	3 years 9 months 18 days	4 years
Weighted Average | Developed technology
Finite-Lived Intangible Assets [Line Items]
Weighted-average remaining amortization period	1 year 9 months 18 days	2 years
Weighted Average | Patents and licenses
Finite-Lived Intangible Assets [Line Items]
Weighted-average remaining amortization period	5 years 3 months 18 days	5 years 7 months 6 days

Balance Sheet Components - Sc_5

Balance Sheet Components - Schedule of Expected Amortization Expense (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2022 (9 months remaining)	$ 4,221
2023	4,615
2024	3,254
2026	2,240
2026	1,078
Thereafter	765
Net carrying amount	$ 16,173	$ 17,885

Operating Leases - Narrative (D

Operating Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Jan. 31, 2021
Leases [Abstract]
Operating lease costs	$ 13,300	$ 10,900
Variable lease costs	2,200	1,400
Short-term lease costs	$ 900	$ 800
Weighted average remaining term of operating leases	7 years 10 months 24 days		8 years
Weighted-average discount rate	5.20%		5.20%
Commitments for operating leases that have not yet commenced	$ 103,236
Operating leases that have not yet commenced, term of lease	12 years

Operating Leases - Schedule of

Operating Leases - Schedule of Operating Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Leases [Abstract]
Operating cash flows used for operating leases	$ 8,310	$ 8,671

Operating Leases - Schedule o_2

Operating Leases - Schedule of Maturities of Operating Lease Liabilities (Details) $ in Thousands	Apr. 30, 2021USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2022 (9 months remaining)	$ 25,423
2023	49,697
2024	50,865
2025	53,285
2026	54,027
Thereafter	216,123
Gross lease payments	449,420
Less: Imputed interest	(67,250)
Less: Tenant improvement receivables	(23,425)
Less: Leases executed but not yet commenced	(103,236)
Present value of lease liabilities	$ 255,509

Debt and Financing Arrangemen_3

Debt and Financing Arrangements - Narrative (Details) $ / shares in Units, shares in Millions	Apr. 09, 2020USD ($)day$ / sharesshares	May 30, 2019USD ($)	Apr. 30, 2021USD ($)	Jan. 31, 2021USD ($)
Convertible Senior Notes
Line of Credit Facility [Line Items]
Aggregate principal amount	$ 862,500,000
Additional amount available for purchase	112,500,000
Total net proceeds from debt offering	$ 841,300,000
Stated interest percentage	0.50%
Limitation on sale of common stock, sale price threshold, number of trading days | day	20
Limitation on sale of common stock, sale price threshold, trading period | day	30
Threshold percentage of stock price trigger	130.00%
Percentage of closing sale price in excess of convertible notes	98.00%
Conversion rate	0.032263
Conversion price (in dollars per share) | $ / shares	$ 31
Redemption price percentage	100.00%
Percentage of aggregate principal amount	25.00%
Carrying amount of equity component	$ 229,200,000		$ 229,249,000	$ 229,249,000
Initial cap price (in dollars per share) | $ / shares	$ 48.62
Number of shares covered in capped call transaction | shares	27.8
Net cost incurred to purchase capped call transactions	$ 105,600,000
Convertible Senior Notes | Discount Rate
Line of Credit Facility [Line Items]
Measurement input	0.0685
Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 215,000,000
Potential increase in limit of aggregate commitments		$ 200,000,000
Potential increase in limit of aggregate commitments, as a percentage of adjusted EBITDA		100.00%
Commitment fee percentage		0.10%
Annual fee percentage		1.25%
Fronting fee percentage		0.125%
Letter of credit amount issued			0
Remaining borrowing capacity			$ 215,000,000
Line of Credit | Prime Rate | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.25%
Line of Credit | LIBOR | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.25%

Debt and Financing Arrangemen_4

Debt and Financing Arrangements - Schedule of Net Carrying Amount of Liability Component (Details) - Convertible Senior Notes - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Debt Instrument [Line Items]
Principal	$ 862,500	$ 862,500
Less: unamortized discount	(187,113)	(197,339)
Less: unamortized issuance costs	(13,163)	(13,763)
Net carrying amount	$ 662,224	$ 651,398

Debt and Financing Arrangemen_5

Debt and Financing Arrangements - Schedule of Carrying Amount of Equity Component (Details) - Convertible Senior Notes - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021	Apr. 09, 2020
Debt Instrument [Line Items]
Proceeds allocated to the conversion options (debt discount)	$ 229,249	$ 229,249	$ 229,200
Less: issuance costs	(5,627)	(5,627)
Carrying amount of the equity component	$ 223,622	$ 223,622

Debt and Financing Arrangemen_6

Debt and Financing Arrangements - Schedule of Interest Expense Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 10,825	$ 2,366
Total interest expense related to the Notes	12,029	2,842
Convertible Senior Notes
Debt Instrument [Line Items]
Contractual interest expense	1,078	252
Amortization of debt discount	10,226	2,245
Amortization of debt issuance costs	600	121
Total interest expense related to the Notes	$ 11,904	$ 2,618

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details)	Apr. 30, 2020USD ($)	Apr. 30, 2020lawsuit	Sep. 30, 2019lawsuit	Apr. 30, 2021USD ($)
Long-term Purchase Commitment [Line Items]
Letter of credit amount outstanding				$ 38,500,000
Number of class action lawsuits filed against the company | lawsuit		3	7
Hosting Commitments
Long-term Purchase Commitment [Line Items]
Minimum annual commitment amount under hosting commitments	$ 75,000,000
Increase in annual commitment amount under hosting commitments	5,000,000
Total minimum commitment amount under hosting commitments	$ 425,000,000
Remaining payment obligation				$ 321,500,000

Stockholders Equity - Narrative

Stockholders Equity - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 31, 2021USD ($)	Apr. 30, 2021USD ($)plan$ / sharesshares
Class of Stock [Line Items]
Preferred stock, number of shares authorized (in shares)		100,000,000
Number of equity incentive plans | plan		2
Unrecognized stock based compensation expense related to options | $		$ 22,900
Purchase of noncontrolling interest | $	$ 22,600	$ 22,648
Stock options
Class of Stock [Line Items]
Unrecognized stock based compensation expense related to options, weighted average period of recognition		3 years 4 months 24 days
Restricted stock units
Class of Stock [Line Items]
Unrecognized stock based compensation expense related to options, weighted average period of recognition		2 years 2 months 12 days
Unrecognized stock based compensation expense | $		$ 660,800
Restricted stock awards
Class of Stock [Line Items]
Unrecognized stock based compensation expense related to options, weighted average period of recognition		2 years 9 months 18 days
Unrecognized stock based compensation expense | $		$ 8,100
Class A Common Stock
Class of Stock [Line Items]
Number of shares authorized for issuance (in shares)		5,000,000,000
Par value (in dollars per share) | $ / shares		$ 0.0001
Number of shares issued (in shares)		510,700,000
Number of shares outstanding (in shares)		510,700,000
Class B Common Stock
Class of Stock [Line Items]
Number of shares authorized for issuance (in shares)		700,000,000
Par value (in dollars per share) | $ / shares		$ 0.0001
Number of shares issued (in shares)		75,000,000
Number of shares outstanding (in shares)		75,000,000
2019 Employee Stock Purchase Plan | Class A Common Stock
Class of Stock [Line Items]
Number of shares issued under employee stock purchase plan (in shares)		800,000

Stockholders Equity - Schedule

Stockholders Equity - Schedule of Stock Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2021	Jan. 31, 2021
Number of shares
Outstanding at beginning of period (in shares)	6,228
Granted (in shares)	0
Exercised (in shares)	(257)
Cancelled (in shares)	(232)
Outstanding at end of period (in shares)	5,739	6,228
Stock options vested and exercisable at end of period, number of shares (in shares)	2,686
Stock options vested and expected to vest at end of period, number of shares (in shares)	5,739
Weighted-average exercise price per share
Outstanding at beginning of period (in dollars per share)	$ 10.31
Granted (in dollars per share)	0
Exercised (in dollars per share)	5.19
Cancelled (in dollars per share)	10.56
Outstanding at end of period (in dollars per share)	10.53	$ 10.31
Stock options vested and exercisable at end of period, weighted-average exercise price per share (in dollars per share)	4.08
Stock options vested and expected to vest at end of period, weighted-average exercise price per share (in dollars per share)	$ 10.53
Weighted-average remaining contractual term (In years)
Outstanding, weighted-average remaining contractual term	6 years 6 months 10 days	6 years 10 months 20 days
Stock options vested and exercisable, weighted-average remaining contractual term	4 years 7 months 13 days
Stock options vested and expected to vest, weighted-average remaining contractual term	6 years 6 months 10 days
Aggregate intrinsic value
Outstanding, aggregate intrinsic value	$ 182,915	$ 198,434
Stock options vested and exercisable, aggregate intrinsic value	102,923
Stock options vested and expected to vest, aggregate intrinsic value	$ 182,915

Stockholders Equity - Schedul_2

Stockholders Equity - Schedule of Restricted Stock Units and Restricted Stock Awards (Details) shares in Thousands	3 Months Ended
	Apr. 30, 2021$ / sharesshares
Restricted stock units
Number of shares
Unvested at beginning of period (in shares) | shares	34,700
Granted (in shares) | shares	6,845
Released (in shares) | shares	(4,155)
Cancelled (in shares) | shares	(1,857)
Unvested at end of period (in shares) | shares	35,533
Weighted-average grant date fair value per share
Unvested at beginning of period (in dollars per share) | $ / shares	$ 19.13
Granted (in dollars per share) | $ / shares	40.97
Released (in dollars per share) | $ / shares	14.79
Cancelled (in dollars per share) | $ / shares	21.05
Unvested at end of period (in dollars per share) | $ / shares	$ 23.74
Restricted stock awards
Number of shares
Unvested at beginning of period (in shares) | shares	1,099
Granted (in shares) | shares	0
Released (in shares) | shares	(117)
Cancelled (in shares) | shares	(23)
Unvested at end of period (in shares) | shares	959
Weighted-average grant date fair value per share
Unvested at beginning of period (in dollars per share) | $ / shares	$ 8.89
Granted (in dollars per share) | $ / shares	0
Released (in dollars per share) | $ / shares	9.04
Cancelled (in dollars per share) | $ / shares	6.22
Unvested at end of period (in dollars per share) | $ / shares	$ 8.94

Stockholders Equity - Schedul_3

Stockholders Equity - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 59,017	$ 53,711
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	2,551	2,354
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	28,809	27,419
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	13,939	14,075
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 13,718	$ 9,863

Interest Income and Other Inc_3

Interest Income and Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Other Income and Expenses [Abstract]
Interest income	$ 465	$ 3,187
Unrealized gains (losses) on foreign exchange	(129)	44
Transaction losses on foreign exchange	(3)	(161)
Change in fair value of strategic investments	39,893	1,638
Other non-operating income, net	200	0
Interest income and other income, net	$ 40,426	$ 4,708

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 1,065	$ 142
Pretax losses	$ 26,880	$ 74,285
Effective tax rate	(4.00%)	(0.20%)

Net Loss per Share Attributab_3

Net Loss per Share Attributable to Slack Common Stockholders - Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Numerator:
Net loss attributable to Slack	$ (27,945)	$ (75,211)
Denominator:
Weighted average common shares outstanding (in shares)	581,550	557,414
Weighted average common shares outstanding (in shares)	581,550	557,414
Net loss per share attributable to Slack common stockholders, basic (in dollars per share)	$ (0.05)	$ (0.13)
Net loss per share attributable to Slack common stockholders, diluted (in dollars per share)	$ (0.05)	$ (0.13)

Net Loss per Share Attributab_4

Net Loss per Share Attributable to Slack Common Stockholders - Potentially Dilutive Securities Excluded from Diluted Per Share Calculations (Details) - shares shares in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)	70,666	54,906
Shares related to convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)	27,827	0
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)	5,739	8,890
Unvested early exercised stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)	6	40
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)	35,533	43,926
Restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)	959	1,456
Restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)	602	0
Employee stock purchase plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)	0	594

Net Loss per Share Attributab_5

Net Loss per Share Attributable to Slack Common Stockholders - Narrative (Details) - $ / shares shares in Thousands	Jun. 07, 2019	Apr. 30, 2021	Apr. 30, 2020	Apr. 09, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities converted from convertible preferred stock to common stock (in shares)		70,666	54,906
Convertible Senior Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion price (in dollars per share)				$ 31
Initial cap price (in dollars per share)				$ 48.62
Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities converted from convertible preferred stock to common stock (in shares)	373,400