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Deferred Revenue and Performance Obligations	9 Months Ended
Deferred Revenue and Performance Obligations	Oct. 31, 2018
Revenue from Contract with Customer [Abstract]
Deferred Revenue and Performance Obligations	Deferred Revenue and Performance Obligations Deferred Revenue Deferred revenue, which is a contract liability, consists primarily of payments received in advance of revenue recognition under the Company’s contracts with customers and is recognized as the revenue recognition criteria are met. Subscription revenue recognized during the three months ended October 31, 2018 and 2017 that was included in the deferred revenue balances at the beginning of the respective periods was $81.6 million and $53.4 million, respectively, and $147.0 million and $95.2 million for the nine months ended October 31, 2018 and 2017, respectively. Professional services and other revenue recognized in the three and nine months ended October 31, 2018 and 2017 from deferred revenue balances at the beginning of the respective periods was not material. Transaction Price Allocated to the Remaining Performance Obligations Transaction price allocated to the remaining performance obligations represents contracted revenue that has not yet been recognized, which includes deferred revenue for subscription contracts that have been invoiced and will be recognized as revenue in future periods. As of October 31, 2018, total remaining noncancelable performance obligations under the Company’s subscription contracts with customers was approximately $614.4 million, and the Company expects to recognize revenue on approximately 55% of these remaining performance obligations over the next 12 months, with the balance to be recognized thereafter. Revenue from remaining performance obligations for professional services and other contracts as of October 31, 2018 was not material. Unbilled Receivables The Company receives payments from customers based on billing schedules as established in its contracts. Unbilled receivables, which are contract assets, relate to the Company’s rights to consideration for performance obligations satisfied but not billed at the reporting date. As of October 31, 2018 and January 31, 2018, unbilled receivables were $1.6 million and $0.8 million, respectively, which are included in prepaid expenses and other current assets in the condensed consolidated balance sheets. Unbilled receivables are transferred to accounts receivable when the rights become unconditional.