Business Combinations Business Combinations Policy [Policy Text Block] Granted (in units) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Options outstanding, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Purchase of convertible promissory note Purchase of Convertible Promissory Note Purchase of Convertible Promissory Note Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Convertible Note Other Assets, Noncurrent, Convertible Note Other Assets, Noncurrent, Convertible Note Marketable Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Vested (in dollars per unit) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Numbers of additional shares authorized under the plan (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] Cloud Computing Arrangement Implementation Costs Research, Development, and Computer Software, Policy [Policy Text Block] Due in one to five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Range [Domain] Statistical Measurement [Domain] Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Convertible Preferred Stock Preferred Stock [Member] Current Fiscal Year End Date Current Fiscal Year End Date Issuance of common stock upon exercise of stock options, net of repurchases (in shares) Stock Issued During Period Shares Issuance Of Common Stock Upon Exercise Of Stock Options Net Of Repurchases Stock issued during the period, shares, issuance of common stock upon exercise of stock options, net of repurchases. Sales and marketing Selling and Marketing Expense [Member] Income from operations Operating Income (Loss) Entity Address, Postal Zip Code Entity Address, Postal Zip Code Total current liabilities Liabilities, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Beginning balance (in dollars per unit) Ending balance (in dollars per unit) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Commitments and contingencies (Note 7) Commitments and Contingencies Assets Assets [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Furniture and Fixtures Furniture and Fixtures [Member] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Entity Shell Company Entity Shell Company Shares vested on the grant date (in shares) Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Proceeds from issuance of common stock for employee stock purchase plan Proceeds from Stock Plans Cover [Abstract] Accounts payable Accounts Payable, Current Document Type Document Type Other Commitments [Table] Other Commitments [Table] Retained earnings Retained Earnings (Accumulated Deficit) Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Reconciliation of cash, cash equivalents, and restricted cash within the condensed consolidated balance sheets to the amounts shown in the condensed consolidated statements of cash flows above: Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Weighted average price per share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased Acquired finite-lived intangible assets, weighted average useful life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Payments for legal settlements Payments for Legal Settlements Class B Common Stock Common Class B [Member] Stock options outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2019 Employee Stock Purchase Plan Two Thousand Nineteen Employee Stock Purchase Plan [Member] Two thousand nineteen employee stock purchase plan. Schedule of Financial Instruments Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Undistributed earnings attributable to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Keybase Keybase [Member] Keybase Maximum number of shares per employee (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee Beginning balance (in shares) Ending balance (in shares) Shares, Outstanding Preferred stock Preferred Stock, Value, Issued Purchase of equity investment Payments to Acquire Equity Method Investments Total operating expenses Operating Expenses Document Quarterly Report Document Quarterly Report Outstanding stock options, vested and exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Schedule of Other Liabilities Non Current Other Noncurrent Liabilities [Table Text Block] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other liabilities, noncurrent Other liabilities, non-current Other Liabilities, Noncurrent Cancelled/forfeited/expired (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Stock-based compensation expense APIC, Share-based Payment Arrangement, Increase for Cost Recognition Cancelled/forfeited/expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Revenue Revenue from Contract with Customer, Excluding Assessed Tax Other Other Assets, Miscellaneous, Current Fair Value, Measurement Frequency Measurement Frequency [Domain] Entity File Number Entity File Number Business Acquisition [Axis] Business Acquisition [Axis] Geographical Geographical [Domain] Statement [Line Items] Statement [Line Items] Summary of Potential Shares of Common Stock Excluded from Computation of Diluted Net Income Per Share Attributable to Common Stockholders Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Class of Stock Class of Stock [Domain] Unrealized gain (loss) on investments Unrealized Gain (Loss) on Investments Document Fiscal Period Focus Document Fiscal Period Focus Remeasurement gain on equity investment Equity Method Investment, Realized Gain (Loss) on Remeasurement Equity Method Investment, Realized Gain (Loss) on Remeasurement Statement [Table] Statement [Table] Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Range Statistical Measurement [Axis] Debt instrument, fair value disclosure Debt Instrument, Fair Value Disclosure Business combination, current assets, other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued U.S. government agency securities US Government Agencies Debt Securities [Member] Other Other Liabilities Other Noncurrent Other liabilities, other, noncurrent. Business Combinations [Abstract] Available for Sale Investments Marketable Securities, Policy [Policy Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Accounts receivable, gross Accounts Receivable, before Allowance for Credit Loss Weighted-average remaining contractual life (years), vested and exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Prepaid expenses Prepaid Expense, Current Schedule of Computation of Basic and Diluted Net Income Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Summary Of Business And Significant Accounting Policies [Line Items] Summary Of Business And Significant Accounting Policies [Line Items] Summary of business and significant accounting policies. Amortization of deferred contract acquisition costs Amortization of Acquisition Costs Weighted-average shares used in computing net income per share attributable to common stockholders: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Amendment Flag Amendment Flag Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Billing Status, Type Billing Status, Type [Axis] Consecutive offering period Share-Based Compensation Arrangement By Share-based Payment Award, Consecutive Offering Period Share-Based Compensation Arrangement By Share-based Payment Award, Consecutive Offering Period Measurement Frequency Measurement Frequency [Axis] Proceeds from employee stock sales to be remitted Proceeds From Employee Stock Sales To Be Remitted Proceeds From Employee Stock Sales To Be Remitted Financial Instruments [Domain] Financial Instruments [Domain] Allowance for Credit Losses Credit Loss, Financial Instrument [Policy Text Block] Equity Investment Equity Method Investments [Policy Text Block] Geographical Geographical [Axis] Shares issued of common stock (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Local Phone Number Local Phone Number Amortized Cost Debt Securities, Available-for-sale, Amortized Cost Unrecognized stock-based compensation expenses related to outstanding unvested stock options Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Marketable Securities [Line Items] Marketable Securities [Line Items] Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Statement of Cash Flows [Abstract] Issuance of common stock upon exercise of stock options, net of repurchases Stock Issued During Period Value Issuance Of Common Stock Upon Exercise Of Stock Options Net Of Repurchases Stock issued during the period, value, issuance of common stock upon exercise of stock options, net of repurchases. Property, Plant and Equipment, Type Long-Lived Tangible Asset [Axis] Employee Stock Purchase Plan Employee Stock [Member] Issuance of common stock upon release of restricted stock units Stock Issued During Period Value Conversion Of Convertible Promissory Notes And Accrued Interest To Common Stock Upon Initial Public Offering Stock issued during period value conversion of convertible promissory notes and accrued interest to common stock upon initial public offering. Income Statement Location Income Statement Location [Axis] Accounts receivable, allowances Accounts Receivable, Allowance for Credit Loss, Current Income Statement Location Income Statement Location [Domain] Other Commitments [Line Items] Other Commitments [Line Items] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Issuance of common stock upon release of restricted stock units (in shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Held For Charitable Contributions Held For Charitable Contributions [Member] Held For Charitable Contributions Summary Of Business And Significant Accounting Policies [Table] Summary Of Business And Significant Accounting Policies [Table] Summary of business and significant accounting policies. Stockholders' Equity Note [Abstract] Entity Current Reporting Status Entity Current Reporting Status Summary of Business and Significant Accounting Policies Business Description and Accounting Policies [Text Block] Other assets, noncurrent Other assets, noncurrent Other Assets, Noncurrent Plan Name Plan Name [Axis] Issuance of common stock upon initial public offering and private placement, net of underwriting discounts and commissions and other offering costs Stock Issued During Period, Value, New Issues Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Total assets Assets Beginning balance (in units) Ending balance (in units) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Intangible assets subject to amortization, net Finite-Lived Intangible Assets, Net Reallocation of net income attributable to common stockholders Reallocation Of Net Income Loss Available To Common Stockholders Diluted Reallocation of net income loss available to common stockholders diluted. Unrealized gain (loss) on available-for-sale marketable securities, net of tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Antidilutive Securities [Axis] Antidilutive Securities [Axis] Investments, Debt and Equity Securities [Abstract] Entity Small Business Entity Small Business Cost of revenue Cost of Sales [Member] Other assets, noncurrent Other Assets, Fair Value Disclosure Schedule of Other Noncurrent Assets Schedule of Other Assets, Noncurrent [Table Text Block] Depreciation and amortization Depreciation, Depletion and Amortization Entity Filer Category Entity Filer Category Schedule of Provision for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Business combination, cash and equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Convertible Note included in other assets, noncurrent Convertible Note Included in Other Assets [Member] Convertible Note Included in Other Assets Total liabilities Liabilities Prepaid expenses and other current assets Prepaid Expenses And Other Current Assets Fair Value Disclosure Prepaid expenses and other current assets, fair value disclosure. Entity Address, City or Town Entity Address, City or Town Proceeds from initial public offering and private placement, net of underwriting discounts and commissions and other offering costs Proceeds From Issuance Initial Public Offering And Private Placement Proceeds from issuance initial public offering and private placement. Unrecognized stock-based compensation excepted to be recognized over a weighted-average period Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Revenue recognized included in deferred revenue Contract with Customer, Liability, Revenue Recognized Commitments and Contingencies Disclosure [Abstract] Net income attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 1 [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Document Fiscal Year Focus Document Fiscal Year Focus Restricted cash, noncurrent included in other assets, noncurrent Restricted Cash and Cash Equivalents, Noncurrent Accounts payable Increase (Decrease) in Accounts Payable Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Debt Instrument Debt Instrument [Axis] Additional Paid-in Capital Additional Paid-in Capital [Member] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Other Other Operating Activities, Cash Flow Statement Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Class of Stock [Line Items] Class of Stock [Line Items] Unbilled contracts receivable Unbilled Contracts Receivable Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Other Other Assets, Miscellaneous, Noncurrent Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue from Contract with Customer [Abstract] Equity investment Equity Method Investments Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Income Tax Disclosure [Abstract] Net income before provision for income taxes Net income before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Research and development Research and Development Expense Initial public offering IPO [Member] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Cash paid for acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Common stock, shares authorized (in shares) Common Stock, Shares Authorized Summary of Restricted Stock Units (RSUs) Activity Under Equity Incentive Plan Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Business acquisition, percentage of voting interests acquired Business Acquisition, Percentage of Voting Interests Acquired Property and equipment, gross Property, Plant and Equipment, Gross Proceeds from exercise of stock options, net of repurchases Proceeds from Stock Options Exercised Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Lessee, operating lease, lease not yet commenced, future lease payments Lessee, Operating Lease, Lease Not Yet Commenced, Future Lease Payments Lessee, Operating Lease, Lease Not Yet Commenced, Future Lease Payments Document Period End Date Document Period End Date Proceeds from employee equity transactions to be remitted to employees and tax authorities, net Increase (Decrease) in Employee Related Liabilities Entity Registrant Name Entity Registrant Name Income Statement [Abstract] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Summary of Contractual Maturities of Marketable Securities Investments Classified by Contractual Maturity Date [Table Text Block] Operating lease liabilities, noncurrent Operating Lease, Liability, Noncurrent Percentage of revenue Percentage Of Revenue Percentage of revenue. Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Use of Estimates Use of Estimates, Policy [Policy Text Block] Current assets: Assets, Current [Abstract] Non-cash operating lease cost Operating Lease Right Of Use Asset Amortization Amortization of right-of-use assets. Violation Of Securities Act Section 10(b), 20(a), and Rule 10b-5 Violation Of Securities Act Section 10(b), 20(a), and Rule 10b-5 [Member] Violation Of Securities Act Section 10(b), 20(a), and Rule 10b-5 Holdback agreements related to employees Holdback Agreements Related to Employees Holdback Agreements Related to Employees Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Asia Pacific (“APAC”) Asia Pacific [Member] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Entity Tax Identification Number Entity Tax Identification Number Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Remaining performance obligation percentage Revenue, Remaining Performance Obligation, Percentage Number of shares available for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Unbilled consideration Unbilled Revenues [Member] Summary Disaggregation of Revenue by Region Disaggregation of Revenue [Table Text Block] Trading Symbol Trading Symbol Entity Information [Line Items] Entity Information [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Summary of Stock-based Compensation Expense by Line Item Share-based Payment Arrangement, Cost by Plan [Table Text Block] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Marketable Securities [Table] Marketable Securities [Table] Issuance of common stock upon release of restricted stock units Restricted Stock, Value, Shares Issued Net of Tax Withholdings Summary of Marketable Securities Debt Securities, Available-for-sale [Table Text Block] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] 2011 Plan Two Thousand Eleven Equity Incentive Plan [Member] Two thousand eleven equity incentive plan. Deferred revenue Increase (Decrease) in Contract with Customer, Liability Fair Value Disclosures [Abstract] City Area Code City Area Code Cost of revenue Cost of Goods and Services Sold Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Marketable securities Estimated Fair Value Total Debt Securities, Available-for-sale Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Equity Components Equity Components [Axis] Title of 12(b) Security Title of 12(b) Security Debt Instrument, Name Debt Instrument, Name [Domain] Minimum Minimum [Member] Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] Operating lease liabilities, current Operating Lease, Liability, Current Unrecognized stock-based compensation expenses Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Payments to acquire equity securities without readily determinable fair value Payments To Acquire Equity Securities Without Readily Determinable Fair Value Payments To Acquire Equity Securities Without Readily Determinable Fair Value Cancelled/forfeited (in dollars per unit) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Corporate and other debt securities Corporate Bond Securities [Member] Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Fair Value Measurements Fair Value Disclosures [Text Block] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Summary of Stock Option Activity Under Equity Incentive Plan Share-based Payment Arrangement, Option, Activity [Table Text Block] Purchase obligation Purchase Obligation Maturities of marketable securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Entity Ex Transition Period Entity Ex Transition Period Billed consideration Billed Revenues [Member] Provision for credit losses Accounts Receivable, Credit Losses Expense (Reversal), Current Accounts Receivable, Credit Losses Expense (Reversal), Current Additional paid-in capital Additional Paid in Capital, Common Stock Business Acquisition [Line Items] Business Acquisition [Line Items] Statement of Stockholders' Equity [Abstract] Accrued compensation and benefits Accrued Employee Benefits, Current Financial Assets: Assets, Fair Value Disclosure [Abstract] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Weighted- Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Research and development Research and Development Expense [Member] Issuance of common stock upon exercise of stock options Stock Issued During Period, Value, Conversion of Convertible Securities Computer and Office Equipment Computer And Office Equipment [Member] Computer and office equipment. Accounts receivable, net of allowances of $26,161 and $7,634 as of July 31, 2020 and January 31, 2020, respectively Accounts Receivable, after Allowance for Credit Loss, Current Depreciation and amortization expense Depreciation, Depletion and Amortization, Nonproduction Deferred contract acquisition costs Increase Decrease In Deferred Contract Acquisition Costs Increase decrease in Deferred contract acquisition costs. Gross Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Sale of Stock Sale of Stock [Axis] Annual increase in Number of shares of common stock available for future issuance Annual Increase In Number Of Shares Of Common Stock For Available For Future Issuance Annual increase in Number of shares of common stock available for future issuance. Debt securities, available-for-sale, realized gain (loss) Debt Securities, Available-for-sale, Realized Gain (Loss) Percentage of purchase price of common stock to fair market value of common stock on offering or purchase date Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent Goodwill Goodwill Less than one year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Outstanding stock options Outstanding Stock Option [Member] Outstanding stock option. Charitable donation of common stock Stock Issued During Period, Value, Charitable Donation Stock Issued During Period, Value, Charitable Donation Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Restricted cash, current included in prepaid expenses and other current assets Restricted Cash and Cash Equivalents, Current Debt instrument face amount Debt Instrument, Face Amount Fair Value, Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] Prepaid expenses and other current assets Other Assets, Current Entities [Table] Entities [Table] General and administrative General and Administrative Expense [Member] Total financial assets Assets, Fair Value Disclosure Europe, Middle East, and Africa (“EMEA”) EMEA [Member] Collections of employee loans Proceeds For Loans To Employees Proceeds For Loans To Employees Entity Central Index Key Entity Central Index Key Balance Sheet Components [Abstract] Balance Sheet Components. Customer deposits liabilities Contract with Customer, Liability, Current Entity Emerging Growth Company Entity Emerging Growth Company Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Diluted (in shares) Weighted-average shares used in computing net income per share attributable to common stockholders, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Basic (in dollars per share) Net income per share attributable to common stockholders, basic (in dollars per share) Earnings Per Share, Basic Cancelled/forfeited (in units) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Sales and marketing Selling and Marketing Expense Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Stock-based compensation expense Share-based Payment Arrangement, Expense Issuance of common stock for employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Common stock, $0.001 par value per share, 2,000,000,000 Class A shares authorized as of July 31, 2020 and January 31, 2020; 194,145,480 and 123,391,114 shares issued and outstanding as of July 31, 2020 and January 31, 2020, respectively; 300,000,000 Class B shares authorized as of July 31, 2020 and January 31, 2020; 90,197,239 and 155,336,747 shares issued and outstanding as of July 31, 2020 and January 31, 2020, respectively Common Stock, Value, Issued Deferred contract acquisition costs, noncurrent Capitalized Contract Cost, Net, Noncurrent Commercial paper Commercial Paper [Member] Restricted cash from international employee stock sales Restricted Cash, Current Options outstanding, aggregate intrinsic value, vested and exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Purchases of marketable securities Payments to Acquire Debt Securities, Available-for-sale Payments for royalties Payments for Royalties Granted (in dollars per unit) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Treasury bills US Treasury Bill Securities [Member] Number of common stock subject to repurchase (in shares) Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Common stock, shares issued (in shares) Common Stock, Shares, Issued Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Convertible Promissory Note Debt, Policy [Policy Text Block] Issuance of common stock upon release of restricted stock units (in shares) Stock Issued During Period Shares Conversion Of Convertible Promissory Notes And Accrued Interest To Common Stock Upon Initial Public Offering Stock issued during period shares conversion of convertible promissory notes and accrued interest to common stock upon initial public offering. Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss Accounts receivable Increase (Decrease) in Accounts Receivable Statement of Comprehensive Income [Abstract] Total stockholders’ equity Beginning balance Ending balance Stockholders' Equity Attributable to Parent Holdback agreements, service period Holdback Agreements, Service Period Holdback Agreements, Service Period Total liabilities and stockholders’ equity Liabilities and Equity Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Income Taxes Income Tax Disclosure [Text Block] Accrued expenses and other current liabilities Accrued expenses and other current liabilities Accrued Liabilities And Other Liabilities Current Accrued liabilities and other liabilities current. Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Purchase of intangible assets Payments to Acquire Intangible Assets RSUs Unvested RSUs Restricted Stock Units (RSUs) [Member] General and administrative General and Administrative Expense Financial Instrument [Axis] Financial Instrument [Axis] Less: undistributed earnings attributable to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Antidilutive securities excluded from computation of earnings per share, amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Convertible Promissory Note Convertible Promissory Note [Member] Convertible Promissory Note Operating lease liabilities, net Increase Decrease In Operating Lease Liabilities Net Increase decrease in operating lease liabilities net. Equity Component Equity Component [Domain] Entity Address, Address Line One Entity Address, Address Line One Gross profit Gross Profit Property and equipment, net Property, Plant and Equipment, Net, Total Property, Plant and Equipment, Net Interest income and other, net Interest Income (Expense), Nonoperating, Net Net income Net income (loss) Net Income (Loss) Attributable to Parent Entity Address, State or Province Entity Address, State or Province Receivables Billing Status Receivables Billing Status [Domain] Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Other Other Liabilities, Current Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Total current assets Assets, Current Operating expenses: Operating Expenses [Abstract] Net income per share attributable to common stockholders: Earnings Per Share [Abstract] Schedule of Accrued Expenses and Other Current Liabilities Accrued Expenses And Other Current Liabilities [Table Text Block] Accrued expenses and other current liabilities. Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Intangible assets, other than goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Entity Interactive Data Current Entity Interactive Data Current Outstanding Stock Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Software Software Development [Member] Certificate of deposit included in prepaid expenses and other current assets Certificates of Deposit [Member] Deferred revenue, noncurrent Contract with Customer, Liability, Noncurrent Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Net income (loss) attributable to common stockholders, diluted Net Income (Loss) Available to Common Stockholders, Diluted Annual increase in shares for available for future issuance by percentage of the outstanding ordinary shares on the first day of such fiscal year. Annual Increase In Shares For Available For Future Issuance By Percentage Of Outstanding Ordinary Shares On Last Day Of Such Fiscal Year Annual increase in shares for available for future issuance by percentage of the outstanding ordinary shares on the last day of such fiscal year. Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Issuance of common stock for employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Common Stock Common Stock [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property, Plant and Equipment, Type Long-Lived Tangible Asset [Domain] Deferred contract acquisition costs, current Capitalized Contract Cost, Net, Current Convertible Debt Convertible Debt [Member] Schedule of Property and Equipment Property, Plant and Equipment [Table Text Block] 2019 Plan Two Thousand Nineteen Equity Incentive Plan [Member] Two thousand nineteen equity incentive plan. Treasury bills US Treasury Securities [Member] Issuance of common stock upon initial public offering and private placement, net of underwriting discounts and commissions and other offering costs (in shares) Stock Issued During Period, Shares, New Issues Leasehold Improvements Leasehold Improvements [Member] Interest rate percentage Debt Instrument, Interest Rate, Stated Percentage Conversion of convertible preferred stock to common stock upon initial public offering (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Money market funds Money Market Funds [Member] Agency bonds Municipal Bonds [Member] Revenue remaining performance obligation, expected timing of satisfaction period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Provision for accounts receivable allowances Accounts Receivable, Credit Loss Expense (Reversal) ESPP excess rate purchase right, value Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Amount Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Amount Less: accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Class A Common Stock Common Class A [Member] Denominator: Earnings Per Share, Diluted [Abstract] Prepaid Expenses and Other Current Assets Prepaid Expenses and Other Current Assets [Table Text Block] Prepaid Expenses and Other Current Assets Issuance of common stock upon exercise of stock options (in shares) Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Net increase in cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Business Combinations Business Combination Disclosure [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Share-based Payment Arrangement, Option Share-based Payment Arrangement, Option [Member] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Basic (in shares) Weighted-average shares used in computing net income per share attributable to common stockholders, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Sale of Stock Sale of Stock [Domain] Plan Name Plan Name [Domain] Revenue Recognition Revenue from Contract with Customer [Text Block] Equity securities without readily determinable fair value, amount Equity Securities without Readily Determinable Fair Value, Amount Sales and other tax liabilities Sales And Other Tax Liabilities Current Sales and other tax liabilities current. Stockholders’ Equity and Equity Incentive Plans Shareholders' Equity and Share-based Payments [Text Block] Class of Stock Class of Stock [Axis] Provision for income taxes Income Tax Expense (Benefit) Issuance of common stock reserved for charitable donation (in shares) Stock Issued During Period, Shares, Charitable Donation Stock Issued During Period, Shares, Charitable Donation Cash, cash equivalents, and restricted cash – beginning of period Cash, cash equivalents, and restricted cash – end of period Total cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Common stock, capital shares reserved for future issuance, charitable donation (in shares) Common Stock, Capital Shares Reserved for Future Issuance, Charitable Donation Common Stock, Capital Shares Reserved for Future Issuance, Charitable Donation Loss contingency, number of defendants Loss Contingency, Number of Defendants Accrued expenses Accrued Liabilities, Current Diluted (in dollars per share) Net income per share attributable to common stockholders, diluted (in dollars per share) Earnings Per Share, Diluted Sales of marketable securities Proceeds from Sale of Debt Securities, Available-for-sale Payments to acquire businesses, gross Payments to Acquire Businesses, Gross Percentage of shares reserved increase Percentage Of Share Based Compensation Arrangements By Share Based Payment Award Options Increase In Shares Reserved For Issuance Percentage of share based compensation arrangements by share based payment award options increase in shares reserved for issuance. Americas Americas [Member] Purchase rights committed under the ESPP Purchase Rights Committed under the ESPP [Member] Purchase Rights Committed under the ESPP Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Accounts receivable, noncurrent Accounts Receivable, after Allowance for Credit Loss, Noncurrent Goodwill and Acquired Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Issuance of common stock upon exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Indefinite-lived intangible assets Indefinite-lived Intangible Assets (Excluding Goodwill) Award Type Award Type [Axis] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Sales and other tax liabilities Sales And Other Tax Liabilities Non Current Sales and other tax liabilities non current. Maximum Maximum [Member] Security Exchange Name Security Exchange Name Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Accumulated Deficit Retained Earnings [Member] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Effective tax rate Effective Income Tax Rate Reconciliation, Percent Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Weighted- Average Remaining Contractual Life (Years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Less: Allowance for credit losses Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss Equity Award Award Type [Domain] Document Transition Report Document Transition Report Number of offering dates Share-Based Compensation Arrangement By Share-based Payment Award, Number of Offering Dates Share-Based Compensation Arrangement By Share-based Payment Award, Number of Offering Dates Proceeds from employee equity transactions to be remitted to employees and tax authorities Employee-related Liabilities, Employee Stock Sales, Current Employee-related Liabilities, Employee Stock Sales, Current Prepaid expenses, noncurrent Prepaid Expense, Noncurrent Less: Allowance for returns Accounts Receivables, Allowance for Returns Accounts Receivables, Allowance for Returns Weighted average exercise price, vested and exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Customer deposits liabilities Deposit Liability, Current Net Income Per Share Attributable to Common Stockholders Earnings Per Share [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Current liabilities: Liabilities, Current [Abstract] Fair Value, Recurring Basis Fair Value, Recurring [Member] Charitable donation of common stock Donation of Common Stock to Charitable Foundation Donation of Common Stock to Charitable Foundation Proceeds from unvested shares of common stock Proceeds From Unvested Shares Of Common Stock Proceeds from unvested shares of common stock. Recently Adopted Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Statement of Financial Position [Abstract] Numerator: Earnings Per Share, Basic [Abstract]