Accounting Standards and Significant Accounting Policies (Policies)	3 Months Ended
Apr. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation	The accompanying unaudited condensed consolidated financial statements, which include the accounts of the Company and its wholly owned subsidiaries, have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP).
Principles of Consolidation	All intercompany balances and transactions have been eliminated in consolidation. The condensed consolidated balance sheet as of January 31, 2020, included herein, was derived from the audited financial statements as of that date. The unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the results of operations for the interim periods presented, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year ending January 31, 2021 or any future period.
Fiscal Period	The Company’s fiscal year ends on January 31. References to fiscal 2021, for example, refer to the fiscal year ending January 31, 2021.
Use of Estimates	The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. The Company bases its estimates on historical experience and on other assumptions that its management believes are reasonable under the circumstances. Actual results could vary from those estimates. The Company’s most significant estimates include the stand alone selling price (SSP) for each distinct performance obligation included in customer contracts with multiple performance obligations, the determination of the period of benefit for deferred commissions, the determination of the effective interest rate of the liability components of its convertible senior notes, the determination of the incremental borrowing rate used for operating lease liabilities, the valuation of deferred income tax assets, and the valuation of acquired intangible assets. In March 2020, the World Health Organization (WHO) declared the outbreak of the novel coronavirus (COVID-19) a pandemic, which continues to spread across the globe. The Company considered the impact of COVID-19 on the assumptions and estimates used and determined that there were no material adverse impacts on the condensed consolidated financial statements for the period ended April 30, 2020. As events continue to evolve and additional information becomes available, our assumptions and estimates may change materially in future periods.
Short-Term Investments	The Company’s short-term investments comprise U.S. treasury securities and corporate debt securities. The Company determines the appropriate classification of its short-term investments at the time of purchase and reevaluates such designation at each balance sheet date. The Company has classified and accounted for its short-term investments as available-for-sale securities as the Company may sell these securities at any time for use in its current operations or for other purposes, even prior to maturity. As a result, short-term investments, including securities with stated maturities beyond twelve months, are classified within current assets in the consolidated balance sheets. Available-for-sale securities are recorded at fair value each reporting period and are periodically evaluated for unrealized losses. For unrealized losses in securities that the Company intends to hold and will not more likely than not be required to sell before recovery, the Company further evaluates whether declines in fair value below amortized cost are due to credit or non-credit related factors. The Company considers credit related impairments to be changes in value that are driven by a change in the creditor’s ability to meet its payment obligations, and records an allowance and recognizes a corresponding loss in interest income and other, net when the impairment is incurred. Unrealized non-credit related losses and unrealized gains are reported as a separate component of accumulated other comprehensive loss in the condensed consolidated balance sheets until realized. Realized gains and losses are determined based on the specific identification method and are reported in interest income and other, net in the condensed consolidated statements of operations.
Accounts Receivable and Allowances	Accounts receivable are recorded at the invoiced amount, net of allowances. These allowances are based on the Company’s assessment of the collectibility of accounts by considering the age of each outstanding invoice, the collection history of each customer, and an evaluation of current expected risk of credit loss based on current conditions and reasonable and supportable forecasts of future economic conditions over the life of the receivable. We assess collectibility by reviewing accounts receivable on an aggregated basis where similar characteristics exist and on an individual basis when we identify specific customers with known disputes or collectibility issues. Amounts deemed uncollectible are recorded as an allowance in the condensed consolidated balance sheets with an offsetting decrease in deferred revenue or a charge to general and administrative expense in the condensed consolidated statements of operations. As of April 30, 2020, allowances reflect increased collectibility and concession concerns stemming from business and market disruption caused by COVID-19 and may fluctuate materially in future periods as the duration and severity of the impact of the COVID-19 pandemic remains uncertain.
Recently Adopted Accounting Pronouncements	In June 2016, the FASB issued ASU 2016-13, which changes the existing incurred loss impairment model for financial assets held at amortized cost. The new model uses a forward-looking expected loss method to calculate credit loss estimates. ASU 2016-13 also eliminates the concept of other-than-temporary impairment and requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. These changes will result in earlier recognition of credit losses. The Company adopted the requirements of ASU 2016-13 as of February 1, 2020 on a modified retrospective basis. The adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (ASU 2018-15), which requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. The Company adopted the requirements of ASU 2018-15 as of February 1, 2020 on a prospective basis. The adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes (ASU 2019-12), as part of its Simplification Initiative to reduce the cost and complexity in accounting for income taxes. ASU 2019-12 removes certain exceptions related to the approach for intraperiod tax allocation and clarifies the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The guidance is effective for interim and annual periods beginning after December 15, 2020, with early adoption permitted. The Company early adopted ASU 2019-12 as of February 1, 2020 on a prospective basis. The adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements.

Accounting Standards and Significant Accounting Policies (Policies)

3 Months Ended

Apr. 30, 2020

The accompanying unaudited condensed consolidated financial statements, which include the accounts of the Company and its wholly owned subsidiaries, have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP).

Principles of Consolidation

All intercompany balances and transactions have been eliminated in consolidation. The condensed consolidated balance sheet as of January 31, 2020, included herein, was derived from the audited financial statements as of that date. The unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the results of operations for the interim periods presented, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year ending January 31, 2021 or any future period.

Fiscal Period

The Company’s fiscal year ends on January 31. References to fiscal 2021, for example, refer to the fiscal year ending January 31, 2021.

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. The Company bases its estimates on historical experience and on other assumptions that its management believes are reasonable under the circumstances. Actual results could vary from those estimates. The Company’s most significant estimates include the stand alone selling price (SSP) for each distinct performance obligation included in customer contracts with multiple performance obligations, the determination of the period of benefit for deferred commissions, the determination of the effective interest rate of the liability components of its convertible senior notes, the determination of the incremental borrowing rate used for operating lease liabilities, the valuation of deferred income tax assets, and the valuation of acquired intangible assets.

In March 2020, the World Health Organization (WHO) declared the outbreak of the novel coronavirus (COVID-19) a pandemic, which continues to spread across the globe. The Company considered the impact of COVID-19 on the assumptions and estimates used and determined that there were no material adverse impacts on the condensed consolidated financial statements for the period ended April 30, 2020. As events continue to evolve and additional information becomes available, our assumptions and estimates may change materially in future periods.

Short-Term Investments

The Company’s short-term investments comprise U.S. treasury securities and corporate debt securities. The Company determines the appropriate classification of its short-term investments at the time of purchase and reevaluates such designation at each balance sheet date. The Company has classified and accounted for its short-term investments as available-for-sale securities as the Company may sell these securities at any time for use in its current operations or for other purposes, even prior to maturity. As a result, short-term investments, including securities with stated maturities beyond twelve months, are classified within current assets in the consolidated balance sheets.

Available-for-sale securities are recorded at fair value each reporting period and are periodically evaluated for unrealized losses. For unrealized losses in securities that the Company intends to hold and will not more likely than not be required to sell before recovery, the Company further evaluates whether declines in fair value below amortized cost are due to credit or non-credit related factors.

The Company considers credit related impairments to be changes in value that are driven by a change in the creditor’s ability to meet its payment obligations, and records an allowance and recognizes a corresponding loss in interest income and other, net when the impairment is incurred. Unrealized non-credit related losses and unrealized gains are reported as a separate component of accumulated other comprehensive loss in the condensed consolidated balance sheets until realized. Realized gains and losses are determined based on the specific identification method and are reported in interest income and other, net in the condensed consolidated statements of operations.

Accounts Receivable and Allowances

Accounts receivable are recorded at the invoiced amount, net of allowances. These allowances are based on the Company’s assessment of the collectibility of accounts by considering the age of each outstanding invoice, the collection history of each customer, and an evaluation of current expected risk of credit loss based on current conditions and reasonable and supportable forecasts of future economic conditions over the life of the receivable. We assess collectibility by reviewing accounts receivable on an aggregated basis where similar characteristics exist and on an individual basis when we identify specific customers with known disputes or collectibility issues. Amounts deemed uncollectible are recorded as an allowance in the condensed consolidated balance sheets with an offsetting decrease in deferred revenue or a charge to general and administrative expense in the condensed consolidated statements of operations.

As of April 30, 2020, allowances reflect increased collectibility and concession concerns stemming from business and market disruption caused by COVID-19 and may fluctuate materially in future periods as the duration and severity of the impact of the COVID-19 pandemic remains uncertain.

Recently Adopted Accounting Pronouncements

In June 2016, the FASB issued ASU 2016-13, which changes the existing incurred loss impairment model for financial assets held at amortized cost. The new model uses a forward-looking expected loss method to calculate credit loss estimates. ASU 2016-13 also eliminates the concept of other-than-temporary impairment and requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. These changes will result in earlier recognition of credit losses. The Company adopted the requirements of ASU 2016-13 as of February 1, 2020 on a modified retrospective basis. The adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (ASU 2018-15), which requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. The Company adopted the requirements of ASU 2018-15 as of February 1, 2020 on a prospective basis. The adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements.

In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes (ASU 2019-12), as part of its Simplification Initiative to reduce the cost and complexity in accounting for income taxes. ASU 2019-12 removes certain exceptions related to the approach for intraperiod tax allocation and clarifies the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The guidance is effective for interim and annual periods beginning after December 15, 2020, with early adoption permitted. The Company early adopted ASU 2019-12 as of February 1, 2020 on a prospective basis. The adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements.