Deferred Revenue and Performance Obligations	3 Months Ended
Apr. 30, 2018
Revenue Recognition And Deferred Revenue [Abstract]
Deferred Revenue and Performance Obligations	Note 9. Deferred Revenue and Performance Obligations We recognized $116.0 million and $92.1 million of subscription services revenue during the three months ended April 30, 2018 and 2017, respectively, that was included in the deferred revenue balances at the beginning of the respective periods. Professional services revenue recognized in the same periods 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 and non-cancelable amounts that will be invoiced and recognized as revenues in future periods. We applied the practical expedient in accordance with Topic 606 to exclude the amounts related to professional services contracts that are on a time-and-material basis. Revenue from remaining performance obligations for professional services contracts as of April 30, 2018 was not material. As of April 30, 2018, approximately $488.6 million of revenue is expected to be recognized from remaining performance obligations for subscription services contracts. We expect to recognize revenue on approximately $395.2 million of these remaining performance obligations over the next 12 months, with the balance recognized thereafter.

Note 9. Deferred Revenue and Performance Obligations

We recognized $116.0 million and $92.1 million of subscription services revenue during the three months ended April 30, 2018 and 2017, respectively, that was included in the deferred revenue balances at the beginning of the respective periods. Professional services revenue recognized in the same periods 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 and non-cancelable amounts that will be invoiced and recognized as revenues in future periods. We applied the practical expedient in accordance with Topic 606 to exclude the amounts related to professional services contracts that are on a time-and-material basis. Revenue from remaining performance obligations for professional services contracts as of April 30, 2018 was not material.

As of April 30, 2018, approximately $488.6 million of revenue is expected to be recognized from remaining performance obligations for subscription services contracts. We expect to recognize revenue on approximately $395.2 million of these remaining performance obligations over the next 12 months, with the balance recognized thereafter.