Summary of Significant Accounting Policies (Policies)	6 Months Ended
Oct. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying interim condensed consolidated balance sheet as of October 31, 2020, the interim condensed consolidated statements of operations and of comprehensive loss, interim condensed statements of shareholders’ equity for the three and six months ended October 31, 2020 and 2019 and the interim condensed consolidated statements of cash flows for the six months ended October 31, 2020 and 2019, are unaudited. These interim condensed consolidated financial statements have been prepared on a basis consistent with the annual consolidated financial statements and, in the opinion of management, include all adjustments necessary to fairly state the Company’s financial position as of October 31, 2020, and the results of the Company’s operations, its statements of shareholders’ equity for the three and six months ended October 31, 2020 and 2019, and its statements of cash flows for the six months ended October 31, 2020 and 2019. The financial data and other financial information disclosed in the notes to these interim condensed consolidated financial statements related to the three and six month periods are also unaudited. The results for the six months ended October 31, 2020 are not necessarily indicative of the operating results expected for the fiscal year ending April 30, 2021, or any future period. The unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and include the financial statements of the Company and its wholly-owned subsidiaries. All intercompany transactions and accounts have been eliminated in consolidation. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the applicable rules and regulations of the Securities and Exchange Commission (“SEC”). Therefore, these unaudited interim condensed consolidated financial statements and accompanying footnotes should be read in conjunction with the Company’s annual consolidated financial statements and related footnotes included in the Company's Annual Report on Form 10-K for the fiscal year ended April 30, 2020 filed with the SEC on June 26, 2020 (“the Company's Annual Report on Form 10-K”).
Fiscal Year	Fiscal YearThe Company’s fiscal year ends on April 30. References to fiscal 2021, for example, refer to the fiscal year ending April 30, 2021.
Use of Estimates and Judgments	Use of Estimates and Judgments The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Such estimates include, but are not limited to, allocation of revenue between recognized and deferred amounts, deferred contract acquisition costs, allowance for credit losses, valuation of stock-based compensation, fair value of ordinary shares in periods prior to the Company’s initial public offering, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, whether an arrangement is or contains a lease, the discount rate used for operating leases and valuation allowance for deferred income taxes. The Company bases these estimates on historical and anticipated results, trends and various other assumptions that it believes are reasonable under the circumstances, including assumptions as to future events. In March 2020, the World Health Organization declared the 2019 novel Coronavirus Disease (“COVID-19”) a pandemic. The pandemic has resulted in a global slowdown of economic activity that is likely to decrease demand for a broad variety of goods and services, including from certain of the Company’s customers, while also disrupting sales channels and marketing activities for an unknown period of time. The full extent to which COVID-19 may impact the Company’s financial condition or results of operations is uncertain. Estimates and assumptions about future events and their effects cannot be determined with certainty and therefore require the exercise of judgment. As of the date of issuance of these financial statements, the Company is not aware of any specific event or circumstance that would require the Company to update its estimates, judgments or revise the carrying value of the Company’s assets or liabilities. These estimates may change, as new events occur and additional information is obtained, and are recognized in the consolidated financial statements as soon as they become known. Actual results could differ from those estimates and any such differences may be material to the Company’s financial statements.
Accounts Receivable and Allowance for Credit Losses	Accounts Receivable and Allowance for Credit Losses The Company records a receivable when an unconditional right to consideration exists, such that only the passage of time is required before payment of consideration is due. Timing of revenue recognition may differ from the timing of invoicing to customers. If revenue recognized on a contract exceeds the billings, then the Company records an unbilled receivable for that excess amount, which is included as part of accounts receivable, net in the Company’s condensed consolidated balance sheets. The Company is exposed to credit losses primarily through the sales of subscriptions and services, which are recorded as accounts receivable, inclusive of unbilled receivables. The Company performs initial and ongoing evaluations of its customers' financial position and generally extends credit without collateral. Accounts receivable are recorded at amortized cost, net of an allowance for credit losses, and do not bear interest. The allowance for credit losses represents the best estimate of lifetime expected credit losses against the existing accounts receivable, inclusive of unbilled receivables, based on certain factors including past collection experience, credit quality of the customer, current aging of the receivable balance, current economic conditions, reasonable and supportable forecasts, as well as specific circumstances arising with individual customers. Judgment is required in assessing these factors. Due to the short-term nature of the Company’s accounts receivable, forecasts have limited relevance to the Company’s expected credit loss estimates. Accounts receivable are written off against the allowance when management determines a balance is uncollectible and the Company no longer actively pursues collection of the receivable. The Company’s estimates of the allowance for credit losses may not be indicative of the Company’s actual credit losses requiring additional charges to be incurred to reflect the actual amount collected.
Recently Adopted Accounting Pronouncements and New Accounting Pronouncements Not Yet Adopted	Recently Adopted Accounting Pronouncements Goodwill Impairment: In January 2017, the FASB issued ASU No. 2017-4, Intangibles— Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The new standard will simplify the measurement of goodwill impairment by eliminating step two of the two-step impairment test. Step two measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The new guidance requires an entity to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. Additionally, an entity should consider income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The Company adopted ASU No. 2017-4 on May 1, 2020. The Company's adoption of this ASU did not have a material impact on the Company's condensed consolidated financial statements. Fair Value Measurements: In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820), which modifies, removes and adds certain disclosure requirements on fair value measurements based on the FASB Concepts Statement, Conceptual Framework for Financial Reporting—Chapter 8: Notes to Financial Statements. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. The Company adopted ASU No. 2018-13 on May 1, 2020. The Company's adoption of this ASU did not have a material impact on the Company's condensed consolidated financial statements. Intangible Assets: In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other— Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in this ASU. The Company adopted ASU No. 2018-15 on May 1, 2020 and applied it prospectively to implementation costs incurred after the date of adoption. The Company’s adoption of this ASU had no material impact on the Company's condensed consolidated financial statements. Credit Losses: In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and has since issued various amendments including ASU No. 2018-19, ASU No. 2019-4, and ASU No. 2019-5. The standard and related amendments modify the accounting for credit losses for most financial assets and requires an entity to utilize a new impairment model known as current expected credit loss (“CECL”) model to estimate its lifetime “expected credit loss” and record an allowance that, when deducted from the amortized costs basis of the financial asset, presents the amount expected to be collected on the financial asset. Additionally, ASU No. 2016-13 amends the current available-for-sale security impairment model for debt securities held for investment. The new model requires an estimate of expected credit losses when the fair value is below the amortized cost of the asset. The credit-related impairment (and subsequent recoveries) are recognized as an allowance on the balance sheet with a corresponding adjustment to the income statement. Non-credit related losses will continue to be recognized through OCI. This guidance also requires new disclosures for financial assets measured at amortized cost, loans and available-for-sale debt securities. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The Company adopted ASU No. 2016-13 on May 1, 2020. The Company's adoption of this ASU resulted in a $0.4 million reduction to accumulated deficit. New Accounting Pronouncements Not Yet Adopted Income Taxes: In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, eliminating certain exceptions to the general principles in ASC 740 related to intra-period tax allocation, deferred tax liability and general methodology for calculating income taxes. Additionally, the ASU makes other changes for matters such as franchise taxes that are partially based on income, transactions with a government that result in a step up in the tax basis of goodwill, separate financial statements of legal entities that are not subject to tax, and enacted changes in tax laws in interim periods. The new guidance becomes effective for the Company for the fiscal year ending April 30, 2022. Early adoption is permitted. The Company does not expect the adoption of the new accounting standard to have a material impact on its consolidated financial statements.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Oct. 31, 2020

The accompanying interim condensed consolidated balance sheet as of October 31, 2020, the interim condensed consolidated statements of operations and of comprehensive loss, interim condensed statements of shareholders’ equity for the three and six months ended October 31, 2020 and 2019 and the interim condensed consolidated statements of cash flows for the six months ended October 31, 2020 and 2019, are unaudited. These interim condensed consolidated financial statements have been prepared on a basis consistent with the annual consolidated financial statements and, in the opinion of management, include all adjustments necessary to fairly state the Company’s financial position as of October 31, 2020, and the results of the Company’s operations, its statements of shareholders’ equity for the three and six months ended October 31, 2020 and 2019, and its statements of cash flows for the six months ended October 31, 2020 and 2019. The financial data and other financial information disclosed in the notes to these interim condensed consolidated financial statements related to the three and six month periods are also unaudited. The results for the six months ended October 31, 2020 are not necessarily indicative of the operating results expected for the fiscal year ending April 30, 2021, or any future period.

The unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and include the financial statements of the Company and its wholly-owned subsidiaries. All intercompany transactions and accounts have been eliminated in consolidation.

Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the applicable rules and regulations of the Securities and Exchange Commission (“SEC”). Therefore, these unaudited interim condensed consolidated financial statements and accompanying footnotes should be read in conjunction with the Company’s annual consolidated financial statements and related footnotes included in the Company's Annual Report on Form 10-K for the fiscal year ended April 30, 2020 filed with the SEC on June 26, 2020 (“the Company's Annual Report on Form 10-K”).

Fiscal Year

Fiscal YearThe Company’s fiscal year ends on April 30. References to fiscal 2021, for example, refer to the fiscal year ending April 30, 2021.

Use of Estimates and Judgments

The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Such estimates include, but are not limited to, allocation of revenue between recognized and deferred amounts, deferred contract acquisition costs, allowance for credit losses, valuation of stock-based compensation, fair value of ordinary shares in periods prior to the Company’s initial public offering, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, whether an arrangement is or contains a lease, the discount rate used for operating leases and valuation allowance for deferred income taxes. The Company bases these estimates on historical and anticipated results, trends and various other assumptions that it believes are reasonable under the circumstances, including assumptions as to future events.

In March 2020, the World Health Organization declared the 2019 novel Coronavirus Disease (“COVID-19”) a pandemic. The pandemic has resulted in a global slowdown of economic activity that is likely to decrease demand for a broad variety of goods and services, including from certain of the Company’s customers, while also disrupting sales channels and marketing activities for an unknown period of time. The full extent to which COVID-19 may impact the Company’s financial condition or results of operations is uncertain.

Estimates and assumptions about future events and their effects cannot be determined with certainty and therefore require the exercise of judgment. As of the date of issuance of these financial statements, the Company is not aware of any

specific event or circumstance that would require the Company to update its estimates, judgments or revise the carrying value of the Company’s assets or liabilities. These estimates may change, as new events occur and additional information is obtained, and are recognized in the consolidated financial statements as soon as they become known. Actual results could differ from those estimates and any such differences may be material to the Company’s financial statements.

Accounts Receivable and Allowance for Credit Losses

The Company records a receivable when an unconditional right to consideration exists, such that only the passage of time is required before payment of consideration is due. Timing of revenue recognition may differ from the timing of invoicing to customers. If revenue recognized on a contract exceeds the billings, then the Company records an unbilled receivable for that excess amount, which is included as part of accounts receivable, net in the Company’s condensed consolidated balance sheets.

The Company is exposed to credit losses primarily through the sales of subscriptions and services, which are recorded as accounts receivable, inclusive of unbilled receivables. The Company performs initial and ongoing evaluations of its customers' financial position and generally extends credit without collateral. Accounts receivable are recorded at amortized cost, net of an allowance for credit losses, and do not bear interest.

The allowance for credit losses represents the best estimate of lifetime expected credit losses against the existing accounts receivable, inclusive of unbilled receivables, based on certain factors including past collection experience, credit quality of the customer, current aging of the receivable balance, current economic conditions, reasonable and supportable forecasts, as well as specific circumstances arising with individual customers. Judgment is required in assessing these factors. Due to the short-term nature of the Company’s accounts receivable, forecasts have limited relevance to the Company’s expected credit loss estimates. Accounts receivable are written off against the allowance when management determines a balance is uncollectible and the Company no longer actively pursues collection of the receivable. The Company’s estimates of the allowance for credit losses may not be indicative of the Company’s actual credit losses requiring additional charges to be incurred to reflect the actual amount collected.

Recently Adopted Accounting Pronouncements and New Accounting Pronouncements Not Yet Adopted

Recently Adopted Accounting Pronouncements

Goodwill Impairment: In January 2017, the FASB issued ASU No. 2017-4, Intangibles— Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The new standard will simplify the measurement of goodwill impairment by eliminating step two of the two-step impairment test. Step two measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The new guidance requires an entity to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. Additionally, an entity should consider income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The Company adopted ASU No. 2017-4 on May 1, 2020. The Company's adoption of this ASU did not have a material impact on the Company's condensed consolidated financial statements.

Fair Value Measurements: In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820), which modifies, removes and adds certain disclosure requirements on fair value measurements based on the FASB Concepts Statement, Conceptual Framework for Financial Reporting—Chapter 8: Notes to Financial Statements. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. The Company adopted ASU No. 2018-13 on May 1, 2020. The Company's adoption of this ASU did not have a material impact on the Company's condensed consolidated financial statements.

Intangible Assets: In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other— Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in this ASU. The Company adopted ASU No. 2018-15 on May 1, 2020 and applied it prospectively to implementation costs incurred after the

date of adoption. The Company’s adoption of this ASU had no material impact on the Company's condensed consolidated financial statements.

Credit Losses: In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and has since issued various amendments including ASU No. 2018-19, ASU No. 2019-4, and ASU No. 2019-5. The standard and related amendments modify the accounting for credit losses for most financial assets and requires an entity to utilize a new impairment model known as current expected credit loss (“CECL”) model to estimate its lifetime “expected credit loss” and record an allowance that, when deducted from the amortized costs basis of the financial asset, presents the amount expected to be collected on the financial asset. Additionally, ASU No. 2016-13 amends the current available-for-sale security impairment model for debt securities held for investment. The new model requires an estimate of expected credit losses when the fair value is below the amortized cost of the asset. The credit-related impairment (and subsequent recoveries) are recognized as an allowance on the balance sheet with a corresponding adjustment to the income statement. Non-credit related losses will continue to be recognized through OCI. This guidance also requires new disclosures for financial assets measured at amortized cost, loans and available-for-sale debt securities. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The Company adopted ASU No. 2016-13 on May 1, 2020. The Company's adoption of this ASU resulted in a $0.4 million reduction to accumulated deficit.

New Accounting Pronouncements Not Yet Adopted

Income Taxes: In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, eliminating certain exceptions to the general principles in ASC 740 related to intra-period tax allocation, deferred tax liability and general methodology for calculating income taxes. Additionally, the ASU makes other changes for matters such as franchise taxes that are partially based on income, transactions with a government that result in a step up in the tax basis of goodwill, separate financial statements of legal entities that are not subject to tax, and enacted changes in tax laws in interim periods. The new guidance becomes effective for the Company for the fiscal year ending April 30, 2022. Early adoption is permitted. The Company does not expect the adoption of the new accounting standard to have a material impact on its consolidated financial statements.